Answer: Heat by Friction
Explanation: When traveling they have a lot of kinetic energy however upon entering the earth's atmosphere the kinetic energy transforms into heat by friction causing it to burn and some of that energy is turned into light.
why do these two magnets attract each other
The force that magnets use to either attract or repel one another is known as magnetism. Electric charges in motion are what generate magnetism.
What is Magnetism?The smallest building blocks of matter are called atoms. There are electrons in every atom, which are charged particles. The electrons that make up an atom's nucleus, or core, spin like tops.
The magnetism of most things is cancelled out by the equal amounts of electrons that spin in opposing directions. Because of this, substances like fabric and paper are referred to as weakly magnetic.
Most electrons in materials like iron, cobalt, and nickel spin in the same direction. The atoms in these become this way.
Therefore, The force that magnets use to either attract or repel one another is known as magnetism. Electric charges in motion are what generate magnetism.
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Which of the curves in the figure shows an isobaric process?
A. horizontal
B. steep curve
C. a less steep curve
D. a very steep bend
Steep curve represents the isobaric processes in thermodynamics process.
In a thermodynamic process, an isobaric process is a process that occurs at a constant pressure. Therefore, the curve that shows an isobaric process would be a horizontal line on a graph where the y-axis represents pressure and the x-axis represents volume or temperature.
On the intuitive level, temperature is associated with notions hot” and cold”. The experience shows that if hot and cold bodies are brought in contact, their temperatures would eventually equilibrate. Consider a system in a thermal contact with the bath and make a quasi-static compression or expansion of the system plotting its states in the (P, V ) diagram.
As the bath is large, its temperature remains unchanged and as the process is slow, the temperature of the system will have the same unchanged value. In this way one obtains the isothermal curve, or isotherm, in the (P, V ) plot.
Hence the correct option is b.
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if the steel ball is shot horizontally off the table, how much time would it take the ball to hit the ground for each of the velocity settings of the launcher?
The time for a steel ball to hit the ground when shot horizontally off a table is independent of the initial velocity, and the formula is [tex]d = v_i*t + (1/2)at^2[/tex].
To decide the time it takes for a steel ball to stir things up around town when shot evenly off a table, we can utilize the conditions of movement, explicitly the kinematic condition:
[tex]d = v_i*t + (1/2)at^2[/tex]
where:
d is the distance voyaged
v_i is the underlying speed
an is the speed increase
t is the time
We can expect that the speed increase is because of gravity, which is steady and equivalent to [tex]9.81 m/s^2.[/tex]
Since the ball is shot on a level plane, its underlying vertical speed is zero. Accordingly, we can work on the situation to:
[tex]d = (1/2)at^2[/tex]
Settling for t, we get:
t = sqrt(2*d/a)
To decide the distance voyaged, we can utilize the way that the ball will follow an explanatory direction and will stir things up around town simultaneously it would have taken to fall upward from a similar level. Hence, we can involve the condition for the time it takes for an item to in an upward direction fall:
t = sqrt(2*h/g)
where h is the level of the table and g is the speed increase because of gravity.
Utilizing the trial information, we can decide the level of the table and the distance the ball goes prior to stirring things up around town for every speed setting of the launcher. Then, we can work out the time it takes for the ball to stir things up around town involving the condition for t.
The time it takes for the ball to stir things up around town will be the equivalent no matter what the speed setting of the launcher, as long as the ball is shot evenly with a similar starting level. This is on the grounds that the underlying speed in the level bearing doesn't influence the time it takes for the ball to upward fall.
This outcome is steady with the way that the time it takes for an item to fall upward just relies upon the level and speed increase because of gravity. Hence, failing upward from the table top to the floor beneath would bring about a similar time it takes for the ball to raise a ruckus around town when shot evenly off the table.
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The complete question is:
If the steel ball is shot horizontally off the table, how much time would it take the ball to hit the ground for each of the velocity settings of the launcher? Explain your answer using the equations of motion and your experimental data. How does this relate to the ball being dropped vertically from the table top to the floor below.
A cup dropped from a certain height which breaks into peices what energy changes are involved?
In a case whereby a cup dropped from a certain height which breaks into peices the energy changes that are involved are:
the potential energy that the cup has is converting into kinetic energy.when that cup falls down to ground the kinetic energy is converted into sound energy.What is meant by energy conversion?The process of turning one form of energy into another is known as energy conversion. Since energy is a variable that is capable of conservation, any change in energy in systems can only be made by removing or adding energy from it.
First, because of its height, it possesses potential energy (P.E. ), which when dropped transforms into kinetic energy (K.E. ), which pushes the object downward, as well as heat energy through friction and collisions with air molecules. Its K.E is transformed into sound energy as it hits the ground, and some energy is used to break the cup into pieces.
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three massive spheres are connected to a rod of very small mass. consider the moment of inertia of the system, first when it is rotated about sphere a, and then when rotated around sphere b. are the moments of inertia the same or different? justify your answer.
To calculate the moments of inertia of the system, we would need to know the masses and positions of the spheres relative to the axis of rotation.
The moment of inertia of an object is a measure of its resistance to rotational motion. It depends on both the mass and the distribution of mass within the object. When a system of spheres connected by a rod is rotated about one of the spheres, the distribution of mass in the system will be different compared to when it is rotated about a different sphere.
To determine whether the moments of inertia of the system when rotated about sphere a and sphere b are the same or different, we need to consider the distribution of mass in each case. If the system is symmetric about both spheres, then the moments of inertia will be the same. However, if the distribution of mass is different, then the moments of inertia will be different.
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oppositely charged parallel plates are separated by 5.16 mm. a potential difference of 600 v exists between the plates. (a) what is the magnitude of the electric field between the plates?
The magnitude of the electric field between the plates is 116279 N/C. A parallel-plate capacitor is a device that stores electric charge and electric potential energy.
The electric field between the plates of a parallel-plate capacitor is given by:
E = V/d
where E is the electric field (in N/C), V is the potential difference (in volts), and d is the distance between the plates (in meters).
In this problem, we are given V = 600 V and d = 5.16 mm = 0.00516 m. Substituting these values into the equation, we get:
E = V/d
E = 600 V / 0.00516 m
E = 116279 N/C
Therefore, the magnitude of the electric field between the plates is 116279 N/C
A parallel-plate capacitor is a device that stores electric charge and electric potential energy. It consists of two conducting plates separated by a small distance, with the space between the plates filled with an insulating material (called a dielectric).
In this problem, we were given the potential difference and the distance between the plates, and we used the formula for the electric field to calculate its magnitude. The electric field is a fundamental concept in electromagnetism, and it plays an important role in a wide range of phenomena, from the behavior of charged particles to the operation of electronic devices.
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The probability of fusion occurring is greatly enhanced when appropriate nuclei are brought close together, but mutual Coulomb repulsion must be overcome. This can be done using the kinetic energy of hightemperature gas ions or by accelerating the nuclei toward one another. (a) Calculate the potential energy of two singly charged nuclei separated by 1.00 x 10^-12. (b) At what temperature will atoms of a gas have an average kinetic energy equal to this needed electrical potential energy?
Electric potential energy = 8.99 x 10^-3 J and the temperature T = 2.01 x 10^7 K
What is the potential energy between two singly charged nuclei separated by a distance of 1.00 x 10^-12 m? Use Coulomb's constant (k= 8.99 x 10^9 N m^2/C^2) and assume the charges of the nuclei are +1. ?
where k is Coulomb's constant (k = 8.99 x 10^9 N m^2/C^2), q1 and q2 are the charges of the two nuclei (each with a charge of +1 since they are singly charged), and r is the separation distance between the nuclei (1.00 x 10^-12 m).
(a) The potential energy of two singly charged nuclei separated by a distance of 1.00 x 10^-12 m can be calculated using the Coulomb potential energy equation:
Electric potential energy = (k * q1 * q2) / r
where k is Coulomb's constant (k = 8.99 x 10^9 N m^2/C^2), q1 and q2 are the charges of the two nuclei (each with a charge of +1 since they are singly charged), and r is the separation distance between the nuclei (1.00 x 10^-12 m).
Plugging in the values, we get:
Electric potential energy = (8.99 x 10^9 N m^2/C^2) * (+1 C) * (+1 C) / (1.00 x 10^-12 m)
Electric potential energy = 8.99 x 10^-3 J
Therefore, the potential energy of two singly charged nuclei separated by a distance of 1.00 x 10^-12 m is 8.99 x 10^-3 J.
(b) We can use the average kinetic energy equation to find the temperature at which atoms of a gas will have an average kinetic energy equal to the electrical potential energy calculated in part (a):
(1/2)mv^2 = (3/2)kT
where m is the mass of a gas atom, v is the root-mean-square velocity of the atoms, k is Boltzmann's constant (k = 1.38 x 10^-23 J/K), and T is the temperature.
To solve for T, we can rearrange the equation:
T = (1/3)mv^2 / k
The mass of a gas atom can be approximated using the molar mass of the gas and Avogadro's number. Let's assume we are considering helium gas, which has a molar mass of approximately 4.00 g/mol. This is equivalent to approximately 6.64 x 10^-27 kg per helium atom.
The root-mean-square velocity of gas atoms can be found using the equation:
v = sqrt((3kT) / m)
We want to find the temperature at which the average kinetic energy of helium gas atoms is equal to the electrical potential energy calculated in part (a), so we can set (1/2)mv^2 equal to 8.99 x 10^-3 J:
(1/2)mv^2 = 8.99 x 10^-3 J
Substituting in the values for m and v, we get:
(1/2) * (6.64 x 10^-27 kg) * [(sqrt((3kT) / m))^2] = 8.99 x 10^-3 J
Simplifying, we get:
sqrt(3kT / m) = sqrt(2 * 8.99 x 10^-3 J / 6.64 x 10^-27 kg)
sqrt(3kT / m) = 2427.5 m/s
Squaring both sides, we get:
3kT / m = (2427.5 m/s)^2
Solving for T, we get:
T = (m / 3k) * (2427.5 m/s)^2
Substituting in the values for m and k, we get:
T = (6.64 x 10^-27 kg / (3 * 1.38 x 10^-23 J/K)) * (2427.5 m/s)^2
T = 2.01 x 10^7 K
therefore the temperature was found to be about T = 2.01 x 10^7 K
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For a certain transverse wave, the distance between two successive maxima is 0.548 m and eight maxima pass a given point along the direction of travel every 11.4 s. Calculate the wave speed.
Answer:
Explanation:
Wave speed = distance between two successive maxima / time for eight maxima to pass = 0.548 m / 11.4 s = 0.048 m/s
On which type of hillside is water erosion most likely to occur?
As a result, in the hilly area where it is hot and it rains frequently, water erosion is more likely to affect the landforms there.
It rains frequently where it is warm, rainy, and humid because evaporation and cloud formation occur at a much faster pace in these conditions.
Landforms are directly impacted by this, particularly in steep areas. It's because one of the things that causes the rocks to weather and erode in this area is the water. While erosion refers to the movement of the rock fragments, weathering refers to the breakdown of the rocks.
When water is moving, the rock minerals dissolve. Compared to hard rocks, soft rocks erode more easily. Additionally, quickly worn and eroded are the carbonate rocks. As a result, the geography of the region is altered.
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the α helix and β pleated sheet are examples of which level of protein structure? a) Primary structure.
b) Tertiary structure.
c) Secondary structure.
d) Quaternary structure.
The α helix and β pleated sheet are examples of the secondary structure of protein. Hence, the correct option is (c).
The secondary structure of a protein refers to the local spatial arrangement of its amino acid residues, which are the building blocks of proteins. The α helix and β pleated sheet are two common types of secondary structure in proteins. The α helix is a right-handed helical structure that is stabilized by hydrogen bonds between the carbonyl group of one amino acid residue and the amide group of another, four residues down the polypeptide chain. The α helix structure resembles a spiral staircase, with the amino acid residues forming the steps and the hydrogen bonds forming the railings. The β pleated sheet, on the other hand, is a sheet-like structure that is stabilized by hydrogen bonds between neighboring amino acid residues in different parts of the polypeptide chain. The β pleated sheet is formed when the polypeptide chain folds back on itself, creating a sheet-like structure with the hydrogen bonds forming the edges of the sheet. The secondary structure of a protein is important because it helps to determine the overall shape of the protein, which in turn determines its function. The α helix and β pleated sheet are important secondary structures in many proteins, including enzymes, antibodies, and structural proteins.
In summary, the α helix and β pleated sheet are examples of the secondary structure of proteins, which refers to the local spatial arrangement of amino acid residues in a protein. The α helix is a right-handed helical structure, while the β pleated sheet is a sheet-like structure. The secondary structure of a protein is important for determining its overall shape and function.
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How does the energy of visible light compare to the energy of infrared radiation?
The energy of visible light is more as compared to the energy of infrared radiation
Does infrared radiation exceed visible light in intensity?
Accordingly, the frequencies of IR, which range from around 300 Ghz to 400 THz, are greater than those of microwaves but lower than those of visible light. Although longer infrared waves can be felt as heat, infrared light is invisible to the human eye.
Due to their longer wavelengths than visible light, infrared waves can travel across crowded areas of gas and dust in space without being significantly scattered or absorbed. As a result, employing optical telescopes, infrared energy can also show celestial objects that are invisible to the eye.
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Balancing a centrifuge requires that all tubes in the load:
A. have an equal amount of liquid of the same viscosity.
B. are of equal size and shape.
C. have a partner directly across in the rotor holder.
D. All of the above
All of the tubes in the load must have an opposite mate in the rotor holder in order for the centrifuge to be balanced. Option C is correct.
Different laboratories employ centrifuges to separate fluids, gases, or liquids based on density. Centrifuges are frequently employed for the purification of cells, organelles, viruses, proteins, and nucleic acids in both research and clinical facilities.
The division of whole blood components using a centrifuge is an example of its utilisation in a clinical environment. Various tests call for serum or plasma, which can be obtained using centrifugation.
By allowing a full blood sample to coagulate at room temperature, serum may be extracted. After centrifuging the sample, the clot is eliminated, leaving a serum supernatant.
In contrast to serum, plasma is made from whole blood that has not been allowed to clot and contains both serum and clotting agents. A full blood sample is drawn into anticoagulant-treated tubes in order to extract plasma.
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A student with a mass of 75.0 kg is sitting on 4-legged lab stool that has a mass of 3.0 kg. Each leg of the stool is circular and has a diameter of 2.50 cm. Find the pressure under each leg of the stool. (Hints: (1) Remember to convert cm² to m² for the area of the legs of the stool. (2) Remember that the stool has four legs. (3) Note that the problem gives the diameter of the legs of the stool, not the radius.)
The pressure under each leg of the stool is approximately 149,675 Pa, or 149.675 kPa.
The pressure under each leg of the stool is approximately 37,419 Pa, or 37.419 kPa.
How to find the pressureThe pressure under each leg of the stool can be calculated by dividing the total force applied by the area of the legs.
First, let's calculate the total force applied by the student and the stool:
Force = Mass x Gravity
= (75.0 kg) x (9.8 m/s²)
= 735 N
The area of each leg of the stool:
Diameter = 2.50 cm
Radius = Diameter / 2
= 2.50 cm / 2
= 1.25 cm
Area = π x (Radius)²
= π x (1.25 cm)²
= 4.91 cm²
Convert the area from cm² to m²:
Area = 4.91 cm² x (1 m / 100 cm)²
= 4.91 x 10^-4 m²
The pressure under each leg:
Pressure = Force / Area
= 735 N / (4.91 x 10^-4 m²)
= 149675 Pa
The pressure under each leg of the stool is approximately 149,675 Pa, or 149.675 kPa. Since the stool has four legs, the total pressure applied by the student and the stool is divided equally among the legs, meaning each leg experiences a pressure of approximately 37,419 Pa, or 37.419 kPa.
The pressure under each leg of the stool can be calculated by dividing the total force applied by the area of the legs.
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29) electrons in an x-ray machine are accelerated from rest trhough a potential difference of 50 kv. what is the kinetic energy of the electrons en ev?
Potential difference difference V = 50,000V
Kinetic Energy K.E. = q v , for electron q=E
KE= 50,000 ev.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes. The body exerts the same amount of effort when slowing down from its current pace to a condition of rest. Formally, a kinetic energy is any term that includes a derivative with respect to time in the Lagrangian of a system.Gottfried Leibniz and Johann Bernoulli were the first to formulate the classical mechanics principle that E mv2, referring to kinetic energy as the "vital power," or vis viva. Experimental proof of this connection was supplied by Willem's Gravesande in the Netherlands. Willem's Gravesande discovered that the penetration depth of weights was proportional to the square of their impact speed by dropping weights from various heights upon a piece of clay.
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a parallel-plate capacitor has 2.00-cm2 plates that are separated by 5.00 mm with air between them. (a) if a 12.0-v battery is connected to this capacitor, how much energy does it store? (b) if a dielectric with a constant of 2.56 were inserted between the plates with the battery attached, what would the energy stored become? (c) repeat (b) for the case where the battery had been disconnected before dielectric insertion.
a) The energy stored in the capacitor is 5.10 × 10⁻¹⁰ J.
b) The energy stored in the capacitor with the dielectric inserted is 1.04 × 10⁻⁹ J.
c) The energy stored in the capacitor with the dielectric inserted and the battery disconnected is 2.14 × 10⁻¹⁰ J.
The energy stored in a parallel-plate capacitor is given by the formula:
U = [tex]\frac{1}{2}CV^2[/tex]
where U is the energy stored, C is the capacitance, and V is the voltage across the capacitor.
(a) The capacitance of a parallel-plate capacitor is given by the formula:
C = [tex]\frac{\epsilon_0A}{d}[/tex]
where [tex]\epsilon_0[/tex] is the permittivity of free space, A is the area of the plates, and d is the distance between them.
Substituting the given values, we have:
C =[tex]\frac{(8.85 \times 10^{-12} \textrm{ F/m})(2.00 \times 10^{-4} \textrm{ m}^2)}{5.00 \times 10^{-3} \textrm{ m}} = 7.08 \times 10^{-12} \textrm{ F}[/tex]
The voltage across the capacitor is given by the battery voltage, which is 12.0 V. Substituting these values into the formula for energy, we have:
U = [tex]\frac{1}{2}(7.08 \times 10^{-12} \textrm{ F})(12.0 \textrm{ V})^2 = 5.10 \times 10^{-10} \textrm{ J}[/tex]
(b) When a dielectric is inserted between the plates, the capacitance increases. The new capacitance is given by the formula:
[tex]C' = \kappa C[/tex]
where [tex]\kappa[/tex] is the dielectric constant of the material.
Substituting the given values, we have:
[tex]C' = (2.56)(7.08 \times 10^{-12} \textrm{ F}) = 1.82 \times 10^{-11} \textrm{ F}[/tex]
The voltage across the capacitor remains the same, so the energy stored in the capacitor becomes:
[tex]U' = \frac{1}{2}(1.82 \times 10^{-11} \textrm{ F})(12.0 \textrm{ V})^2 = 1.04 \times 10^{-9} \textrm{ J}[/tex]
(c) If the battery is disconnected before the dielectric is inserted, the charge on the plates remains the same. However, the voltage across the capacitor decreases due to the increased capacitance. The new voltage is given by the formula:
[tex]V' = \frac{V}{\kappa}[/tex]
Substituting the given values, we have:
[tex]V' = \frac{12.0 \textrm{ V}}{2.56} = 4.69 \textrm{ V}[/tex]
The energy stored in the capacitor becomes:
[tex]U' = \frac{1}{2}(1.82 \times 10^{-11} \textrm{ F})(4.69 \textrm{ V})^2 = 2.14 \times 10^{-10} \textrm{ J}[/tex]
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at a football tryout, a player runs a 40-yard dash in 4.25 seconds. if he reaches his maximum speed at the 16-yard mark with a constant acceleration and then maintains that speed for the remainder of the run, determine his acceleration over the fi rst 16 yards, his maximum speed, and the time duration of the acceleration.
Acceleration of the player over the first 16 yards is 48/t^2 = 140.68 m/s^2, the maximum speed is 48/t = 80.86 m/s (or about 181 miles per hour), and the time duration of the acceleration is 0.593 seconds.
First, we can find the acceleration :
[tex]d = (1/2)at^2[/tex]
[tex]t = sqrt(2d/a) = sqrt(2*14.63/a)[/tex]
[tex]t2 = 4.25 - t1[/tex]
We can use equations of motion for uniform acceleration for maximum speed. The equations are:
[tex]v = u + at[/tex]
[tex]s = ut + (1/2)at^2[/tex]
[tex]v^2 = u^2 + 2as[/tex]
where u is the initial velocity, v is the final velocity, s is the distance covered, a is acceleration.
[tex]v = u + at = at[/tex]
[tex]v^2 = u^2 + 2as[/tex]
[tex]v^2 = 2as[/tex]
Substitute expressions for v and s from two equations,
[tex]a^2t^2 = 2a(24)[/tex]
[tex]a = 48/t^2[/tex]
[tex]v = at[/tex]
[tex]v = 48t/t^2 = 48/t[/tex]
To find the time duration of the acceleration, we can solve the equation for t in terms of a:
[tex]t = sqrt(2d/a) = sqrt(2*14.63/a)[/tex]
[tex]t = sqrt(2*14.63/(48/t^2)) = 0.593 seconds[/tex]
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at maximum performance, a particular engine performs 19800 j of work in 95 minutes. what is its power rating?
The power rating of an engine that has maximum performance which performs 19800 j of work in 95 minutes is 3.46kW.
Power is calculated by the equation Power = Work / Time.
Power is the rate at which work is done or energy is transferred or converted. It is the rate at which work is done or energy is transformed from one form to another. It is commonly expressed in watts (W) or joules per second (J/s). Power is the product of work and time. The amount of work done is determined by the amount of time it takes for the work to be completed, and the amount of power is determined by the amount of work accomplished in a given amount of time.
Power rating = 19800 J / (95 minutes x 60 seconds/minute)
Power rating = 19800 J / 5700 s
Power rating = 3.46 kW
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A 65 kg teacher (including the parachute) is skydiving. As the parachute opens, the system experiences 1400 N air resistance (drag).
The force of gravity on the parachute/teacher system is ___ down. The net force is ___.
Choices:
637 N
65kg
1400 N
1400 N up
763 N down
763 N up
Gravity is a fundamental force of nature that exists between any two objects that have mass. It is an attractive force that pulls objects toward each other. The net force on the parachute/teacher system is 763 N up.
What is Gravity?The force of gravity is directly proportional to the masses of the objects and inversely proportional to the distance between them. The more massive the objects and the closer they are, the stronger the force of gravity between them.
The force of gravity on the parachute/teacher system is 637 N down.
[tex]F_gravity = m \times g[/tex]
Where m is the mass of the teacher and parachute system, and g is the acceleration due to gravity, which is approximately 9.8 m/s^2 near the surface of the Earth.
[tex]F_gravity = 65 kg \times 9.8 m/s^2 = 637 N down[/tex]
The net force is the vector sum of the forces acting on the system. In this case, there are two forces acting on the system: the force of gravity (637 N down) and the air resistance (1400 N up).
The net force is given by:
[tex]F_net = F_drag - F_gravity[/tex]
where [tex]F_drag[/tex] The air resistance [tex](1400 N[/tex]Up).
So,
[tex]F_net = 1400 N[/tex] [tex]up – 637 N[/tex] down = [tex]763 N[/tex]up
Therefore, the net force on the parachute/teacher system is [tex]763 N[/tex] Up.
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A nasa orbiter recently captured craters and formations on mars that resembled the face of which animal?
A NASA orbiter recently captured craters and formations on mars that resembled the face of a bear's face.
NASA’s Mars surveillance orbiter camera captured an unusual conformation that — much to the delight of scientists and space watchers looked like the shape of a bear’s face, hundreds of millions of long hauls down.
The “ nose ” is actually a hill in the shape of the letter V; its “ eyes ” are two small, crooked craters, according to the University of Arizona, which participated its analysis of the print last week.
The circle making up the “ head ” — what the university called “ the indirect fracture pattern ” — “ might be due to the settling of a deposit over a buried impact crater. ”
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two forces are acting on an object. one force is 6 n forward. the other force is 8 n backward. what is the net force acting on the object?
Answer:
2 N backward
Explanation:
Positive direction is forward.
Fnet = 6 N - 8 N = -2 N
Negative sign in the result means the net force is 2 N backward
what is the total charge of all the electrons in a 20 kg bar of aluminum? (aluminum has 13 electrons per atom and an atomic mass of 27 u .)
Given that Aluminum has 13 electrons per atom and an atomic mass of 27 u, we can use Avogadro's number (6.022 × 10^23 atoms/mole) to calculate the number of aluminum atoms in the 20 kg bar.
27 g/mol (atomic mass) x 1 kg / 1000 g = 0.027 kg/mol
The number of moles of aluminum in the 20 kg bar:
20 kg / 0.027 kg/mol = 740.74 moles
Finally, we can calculate number of aluminum atoms:
[tex]740.74 moles * 6.022 × 10^23[/tex] atoms/mole = [tex]4.460 * 10^26[/tex] atoms
4.460 × 10^26 atoms x 13 electrons/atom x 1.602 × 10^-19 coulombs/electron = 1.167 × 10^7 coulombs.
The total charge of all the electrons in a 20 kg bar of aluminum is approximately 1.167 × 10^7 coulombs.
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Use the diagram above to answer the question.
If a box of 20.91 kg is sliding down the ramp at an angle of 40.29 at a constant velocity, what is the force of friction acting on the box?
Type your answer...
The frictional force is -156 N.
What is the force of friction?Friction is the force that opposes motion between two surfaces that are in contact. Frictional force acts in the opposite direction of the intended motion and acts to slow down or stop an object from moving. The magnitude of the frictional force depends on several factors, including the types of surfaces in contact, the normal force acting on the object, and the coefficient of friction between the two surfaces.
In this case, we can see that the frictional force would act in the opposite direction thus its magnitude would be;
Frictional force = - mgcosθ
= -20.91 * 9.8 * cos 40.29
= -156 N
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The first basic step in solving force and motion problems generally involves identifying all of the forces acting on an object. This tactics box provides a step-by-step method for identifying each force in a problem. 1. Identify the object of interest. This is the object whose motion you wish to study. 2. Draw a picture of the situation. Show the object of interest and all other objects—such as ropes, springs, or surfaces-that touch it. 3. Draw a closed curve around the object. Only the object of interest is inside the curve, everything else is outside. 4. Locate every point on the boundary of this curve where other objects touch the object of interest. These are the points where contact forces are exerted on the object. 5. Name and label each contact force acting on the object. There is at least one force at each point of contact: there may be more than one.
Crate is the subject of attention. Forces are applied to the crate via rope, wood board, and earth. Below is a picture that corresponds to this query.
Although feeble, gravitational force has a very vast range. Additionally, it always looks good. Since mass is its source, it operates between any two particles of matter in the universe.
Neutrino interactions and radioactive decay are both caused by the weak forces. It has a rather small range. It is quite weak, as its name suggests. Beta-decay, or the decay of a neutron into a proton, an electron, and an antineutrino, is brought on by the weak force.
The electromagnetic force has electric and magnetic effects, such as the attraction of bar magnets or the repelling of electrical charges that are similar to one another. Despite being considerably weaker than the strong force, it has a considerable range. It only works between particles of matter carrying an electrical charge and can be either attracting or repulsive. magnetism, electricity.
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A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, what is the actual volume of water measured out? O 10.000 mL O 9.990 mL O The actual volume measured out is impossible to tell O 10.012 mL
10.012ml is the actual volume of water measured out.
What does the word "volume" mean?
Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space occupied within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.
The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. Typically, there are two forms of density: absolute density and relative density. The ratio of a substance's density to the density of a reference material is known as its relative density, sometimes referred to as specific gravity. Water is frequently used as the reference material.
D ⇒ M/V
V ⇒ M/D
M ⇒ 9.990g
D⇒ 0.9978g/ml
V ⇒ 9.990/0.9978 ⇒ 10.012ml
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how does the application of cool pads and spraying of water on the skin lower the body temperature?
Application of cool pads and spraying of water on the skin lowers the body temperature by increasing the rate of evaporation.
How does the application of cool pads and spraying of water on skin lower body temperature?Application of cold water to the skin can be achieved by either sponging patient or using spray bottle. Placing fan to blow directly on patient while also spraying or sponging will increase rate of evaporation, and therefore will more rapidly decrease body temperature
Spraying water on your body helps cool it off because of evaporative cooling. Turning liquid from its liquid state into a gas requires energy. This energy is taken from our body in the form of heat and the resulting heat transfer leads to desired cooling effect.
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a spaceship has a rest mass of 620,000 tons. if you could measure its mass when it was traveling at half the speed of light, what would the value be?
The rest mass of a spacecraft is 620,000 tons. Its mass would be 715,088.8 tons if you could measure it when it was moving at half the speed of light.
The mass of a moving object is given by the relativistic mass formula:
[tex]m = m_0 / \sqrt{(1 - v^2/c^2)}[/tex]
here,
m₀ is rest mass of the object,
v is velocity, and
c is speed of light.
In this case, the rest mass of the spaceship is m₀ = 620,000 tons. If it is traveling at half the speed of light, its velocity is v = 0.5c, where c is approximately 299,792,458 m/s.
Reserving the values:-
[tex]m = m_0 / \sqrt{(1 - v^2/c^2)}[/tex]
= [tex]620,000 tons / \sqrt{(1 - (0.5c)^2/c^2)}[/tex]
=[tex]620,000 tons / \sqrt{(1 - 0.25)}[/tex]
= [tex]620,000 tons / \sqrt{(0.75)}[/tex]
= 620,000 tons / 0.866
= 715,088.8 tons
Therefore, the mass of the spaceship when it is traveling at half the speed of light is approximately 715,088.8 tons. Note that the relativistic mass of an object increases as its velocity approaches the speed of light. At speeds much smaller than the speed of light, the relativistic mass is approximately equal to the rest mass.
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what can be said about the tonight's night sky in these two places? what can be said about the tonight's night sky in these two places? the sky will have completely different sets of constellations. the sky will look about the same. the sky will have partially different sets of constellations.
Option A is correct, While their longitudes are different, Beijing and Philadelphia are essentially at the same latitude. As a consequence, both of these places will have a similar night sky tonight.
Because of the Earth's orbit of the sun, the apparent locations of the star's various constellations in the night sky fluctuate throughout the year. The latitude of the observer and the Earth's rotation, however, govern the locations of the stars and constellations at any given moment.
The same stars as well as constellations would be visible in both Beijing and Philadelphia since they are located at a similar latitudes.
The night sky will appear to spin around a particular perspective for each location, however, because of their varying longitudes, which will cause some variations in the constellations that are visible.
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The question is -
Beijing and Philadelphia have about the same latitude but very different longitudes. what can be said about tonight's night sky in these two places?
a. the sky will have completely different sets of constellations.
b. the sky will look about the same.
c. the sky will have partially different sets of constellations.
What is the name for a burst of activity on an EEG in the early stages of sleep?
gamma waves
sleep spindles
REM
lingering activation
The name for a burst of activity on an EEG in the early stages of sleep is "sleep spindle".
What is sleep spindle?A burst of brain activity during non-rapid eye movement (NREM) sleep is known as a sleep spindle and can be seen on an electroencephalogram (EEG). Although it can occur in other NREM sleep stages as well, it is a hallmark of Stage 2 sleep.
Sleep spindles are characterized by a burst of rhythmic brain activity that spans from 11 to 16 Hz and are short (often lasting only a few seconds). The thalamus, a region of the brain that is essential for transmitting sensory data to the cerebral cortex, is the source of this activity. The thalamus absorbs sensory input during sleep and modifies the information flow to the cortex, enabling the brain to filter out unimportant inputs and concentrate on significant ones.
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I need help in this please
The net electric force on charge +q is along direction C.
option C.
What is the electric force between two charges?
The electric force between two charges is determined applying Coulomb's law of electrostatic force.
Mathematically, the formula for this law is given as;
F = kq₁q₂/r²
where;
k is the Coulomb's constantq₁ is the magnitude of charge 1q₂ is the magnitude of charge 2r is the distance between the chargesThe strength of the electric force increases with decrease in the distance between the two charged particles.
The distance between the charge at the center and
point C = 1.5 dpoint B = 2dpoint D = point A = √[ (1.5d)² + (2d)² ] = 2.5dThe electric force is strongest towards point C, so the direction of the force will be towards point C.
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and a student measures the length of a 1.00 m standard bar. he obtains measurements of 0.80 m, 0.78 m, and 0.79 m. which describes his measurements?
The length of the 1.00 m standard bar was measured by the student, and the results show approximate but correct readings.
In measurements, precision refers to the consistency and reproducibility of the measured values whereas accuracy refers to how closely the measured values resemble the true or accepted value.
With a 1.00 m standard bar, the student in this instance measured 0.80 m, 0.78 m, and 0.79 m. Since the measurements' range is 0.02 m (0.80 m - 0.78 m), which is disproportionately large given the amount of the measured quantity, they are not exact. Yet, the measurements are precise since they are near to the actual value of 1.00 m.
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