The two best ways to measure the distance to a distant, isolated spiral galaxy are by using the redshift of the galaxy and/or by using the Cepheid variable star method.
What is distance?Distance is a numerical measurement of how far apart two objects, points, or locations are. It is a measure of space in terms of length, width, or height. Distance can be measured in a variety of units including miles, kilometers, yards, and feet. Distance can also be measured in time, such as the amount of time it takes to travel from one location to another. Distance is an important concept in many areas of life, from transportation to navigation to sports.
The redshift of a galaxy is a measure of the expansion of the universe, and is determined by the Doppler Effect. It is calculated using the wavelength of a galaxy's light and the frequency of that light. Redshift can be used to measure the distance of a galaxy by comparing the redshift of the galaxy with the redshift of a standard reference. The further away a galaxy is, the greater its redshift will be.
The Cepheid variable star method is also a reliable way of measuring the distance of a distant spiral galaxy. Cepheid variable stars are stars that pulsate at a regular period, and they can be used as a “standard candle” of sorts, because their luminosity is related to their period. By measuring the period and luminosity of Cepheid variable stars in a distant spiral galaxy, astronomers can calculate the distance to that galaxy.
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The gravitational force between two objects is proportional to 1/R (and not as 1/R² ) where R is separation between them, then a particle in a circular orbit under such a force would have its orbital speed ν proportional toA. 1/R² B. R drajatC. R^1 D. 1/R
The correct answer is D. 1/R. This is because the gravitational force between two objects is proportional to 1/R, so the orbital speed of a particle in a circular orbit would also be proportional to 1/R.
What is gravitational force?Gravitational force is the force of attraction between two objects with mass. It is a natural phenomenon that exists between all objects in the universe and is one of the four fundamental forces of nature, along with the strong and weak nuclear forces and electromagnetic force. Gravitational force acts instantaneously across large distances and is equal in magnitude and opposite in direction for the two objects involved. It is the weakest of the four forces, but it has the longest range, acting on all matter, even particles and particles of light.
This is because the particle is constantly experiencing the same gravitational force, so the magnitude of the orbital speed must be equal to the magnitude of that force divided by the mass of the particle. Therefore, the orbital speed of the particle is proportional to 1/R.
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a ferry boat is 4.00 m wide and 6.00 m long. when a large loaded truck pulls onto it, it sinks 4.00 cm in the water. what is the weight of the truck? (9.41 x 103 n)
The weight of the truck is 11100N
Upthrust, often known as buoyancy, is an upward force applied by a fluid against the weight of an object that is partially or completely submerged. A fluid column's pressure rises with depth due to the weight of the surrounding fluid. As a result, an object whose average density is higher than the fluid it is submerged in has a tendency to sink. The force can keep an object floating if it is less dense than the liquid. Only a reference frame that is not inertial and either has a gravitational field or is accelerating due to an external force that defines a "downward" direction can experience this.
The weight of the truck will be obtained by solving for the buoyant force..
[tex]F_{b}[/tex]=[tex]\rho\: V_{submerged}\:g[/tex]
the volume submerged=[tex]4.00m\:\times6.00m\times\:0.047m\:=1.13m^{3}[/tex]
and the density of water is 1000kg/[tex]m^{3}[/tex]
F=[tex]1000kg/m^{3}\:\times1.13m^{3}\:\times 9.8m/s^{2}[/tex]=11100N
The vertical forces are the weight of the truck (you know it's the truck and not the boat itself because the boat submerges only after the truck's on it) and the buoyant force. The boat is not accelerating up or down, so:
[tex]F_{b}[/tex] -[tex]F_{w}[/tex]=0
[tex]F_{b}[/tex]=[tex]F_{w}[/tex]
[tex]F_{w}[/tex]=11100N.
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a roller coaster makes a vertical loop (without stopping) in which it is upside down at the top. will your sunglasses fall out of your pocket? group of answer choices no yes. you would need more information.
No, sunglasses in a pocket will stay in the pocket when going through a vertical loop on a roller coaster. The sunglasses will experience the same force.
What is the centripetal force?When a roller coaster goes through a vertical loop, the riders experience a force known as centripetal force, which pushes them towards the center of the loop. This force is what keeps the riders in their seats and prevents them from falling out of the coaster. The same force also applies to objects in a rider's pockets, such as sunglasses. The centripetal force pushes the sunglasses towards the center of the loop and against the walls of the pocket, keeping them securely in place.
What is roller coaster?Additionally, most roller coasters are designed with safety in mind, and the pockets on the seats and restraints are typically deep enough to keep smaller objects from falling out. So even if the sunglasses are not hold tightly by the centripetal force, the deep pockets will prevent them from falling out.
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Calculate the work W done by the gas during process 1→2. Express your answer in terms of p0 and V0.
The work done by the gas during process 1→2 can be expressed in terms of p0 and V0 as W = p0(V2 - V0).
What is gas?Gas is a form of energy that is created from the combination of certain elements. It is a form of fuel that is often used to power engines, heat homes, and cook food. It is also used in many industrial processes and is a major component of both natural gas and petroleum. Gas is made up of a combination of hydrocarbons, which are molecules composed of hydrogen and carbon atoms. Depending on the type of gas, the molecules may also contain oxygen, nitrogen, and other elements. Natural gas is found underground and is composed mostly of methane, while petroleum gas is a combination of natural gas and oil.
The work done by the gas during process 1→2 is given by the equation W = p0(V2 - V1). Since we are given the initial state (p0, V0) and the final state (p2, V2), we can calculate the work done by the gas:
W = p0(V2 - V0)
Therefore, the work done by the gas during process 1→2 can be expressed in terms of p0 and V0 as W = p0(V2 - V0).
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A 3. 1-kilogram gun initially at rest is free to move. When a 0. 015-kilogram bullet leaves the gun with a speed of 500 meters per second, what is the speed of the gun?.
The speed of the gun which was initially at rest and leaves the bullet with certain speed is calculated to be 2.42 m/s.
Given that,
Mass of the gun M = 3.1 kg
The bullet's mass is m = 0.015 kg
The bullet's speed is v = 500 m/s
According to momentum conservation principle, the momentum before the bullet leaving the gun is equal to the momentum after the bullet leaving the gun. Both the gun and the bullet will be at rest initially, so the total momentum must be equated to zero.
Mathematically, 0 = m v + M V
where,
V is the velocity of the gun
Making V as subject, we have,
V = - (m v)/ M = -(0.015 × 500)/3.1 = -2.42 m/s
Hence, the gun is moving 2.42 m/s faster than the bullet.
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you can assume that all fluids you will reason about in this course are incompressible. what does incompressible mean? both the fluid's density and its pressure are constant the fluid's pressure is constant the fluid's density is constant
When a fluid's volume or density does not change with pressure, it is said to be incompressible.
A fluid is considered to be incompressible if its density is unaffected by changes in pressure. Real incompressible fluid does not exist. However, in many flow circumstances, the variations in density brought on by changes in the flow's pressure are quite slight. Treating the fluid as incompressible makes it much easier to solve fluid flow equations. When dealing with low-speed aerodynamics or other fluid dynamics situations, we frequently model flows as incompressible (generally with liquids). The density is typically assumed to be constant. This is yet another way of expressing the fluid's incompressibility and the limitless nature of c. (and Mach number is zero).
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ice has formed on a shallow pond and a steady state has been reached, with the air above the ice at -5.0oc and the bottom of the pond at 4.0oc. if the total depth of ice water is 1.4 m, how thick is the ice? take the thermal conductivity of ice as 1.6 wm-1k-1 and that of water as 0.50 wm-1k-1.
Ice has formed on the surface of a, and a temperature balance has been achieved between the air above the ice (-5.0 °C) and the bottom of the pond (4.0 °C). The earth's temperature is = 296.946K.
What does being steady mean?adjective. When you describe someone as steady, you're referring to their dependability and common sense. He was powerful and stable, in contrast to other people she had met. reliable, wise, reasonable, and fair are synonyms for additional phrases for constant
Calculation
r₁= 0.05m
r₂= 0.08m
Tn =Ti = 77K
Ki = 0.0035 Wm-1K-1
Kg = 1 Wm-1K-1
Z= 2m
Now,
The outer type temperature (Skin temperature pipe)
Q = T₀ -T₁/ln (r2/r1)/2πKi = 2πKi T0 -T1/ln (r2/r1)
Thus,
10 w/m = 2π * 0.0035 = T0 -77/ln 0.08/0.05
⇒ T₀ -77 = 231.72
T₀= 290.72K
The shape factor between the cylinder and he ground
S = 2πL/ln 4z/D
where L = length of pipe
D = outer layer of pipe
S = 2π * 1/4 *2/ 2 * 0.08 = 1.606m
The heat gained in the pipe is = S * Kg * (Tg- T₀)
(10* 1) = 1.606 * 1* (Tg- 290.72)
Tg - 290.72 = 6.2266
Tg = 296.946K
Therefore the surface temperature to the ground is 296.946K
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Consider this system at equilibrium. A(aq) B(aq) Delta H = +550 kJ/mol What can be said about Q and K immediately after an increase in temperature? Q > K because Q increased Q > K because K decreased O < K because Q decreased Q < K because K increased Q = K because neither changed
According to the Chemical equilibrium Q<K because K increased,Shift Right.
The reaction is as follows:
A (aq) [tex]\leftrightarrow[/tex] B (aq)
Given AH = +550 kJ/mol. It indicates that the reaction is endothermic
For an endothermic reaction, if temperature increases the equilibrium
shifts towards the right side (Product side). Which means K is greater than 1.
Thus, Q< K because K is increased.
Chemical equilibrium refers to the situation in a chemical reaction where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties. At equilibrium, the forward and reverse reactions are proceeding at the same rate
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how can you show that electric currents create magnetic fields? check all that apply. how can you show that electric currents create magnetic fields?check all that apply. if you place a magnet near a closed circuit with current flowing, it will exert a force on the circuit wires. if you place a coil of wire near a magnet and direct a current through the coil, it will exert a force on the magnet, depending on its orientation. if you place two wires with currents perpendicular to each other, they will be attracted each other. if you position a charge near a wire with a current, it will be attracted or repelled by the wire.
The magnetic field created by a current-carrying wire will exert force on the wire if a magnet and wire are combined, hence the statement is true.
Describe a force.The word "force" has a clear definition. At this stage, calling a force a pull or a push is totally appropriate. A force is not a property an object "has though" or that it "includes." One thing encounters a force from another. There is no differentiation between living and non-living objects in the conception of either a force.
How does balance force work?symmetrical forces Forces that are equal in size and opposing in direction are said to be balanced forces. Equilibrium is regarded as a condition of equal forces. When forces are in equilibrium.
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a 250 g ball travels at a velocity of 40 m/s. its momentum is O 160 kg-m/s. O 10 kg-m/s. O 4 kg.m/s. O 10,000 kg·m/s
When a 250 g ball travels at a velocity of 40 m/s, its momentum is 10 kg-m/s.
In physics, momentum is defined as the product of an object's mass and velocity. It is a vector quantity, which means it has both magnitude and direction. The direction of momentum is the same as the direction of motion of the object.
The momentum of an object is equal to its mass multiplied by its velocity. Therefore, the momentum of a 250 g ball traveling at a velocity of 40 m/s is:
momentum = mass x velocity
momentum = 250 g x 40 m/s
momentum = 10,000 g-m/s
Note that the unit of momentum is usually represented as kgm/s, but since the mass is given in grams, we need to convert it to kg.
momentum = 10,000 gm/s = 10 kg-m/s
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As the frequency of a wave increases on the electromagnetic spectrum, what happens to the wave's energy
As the frequency of a wave increases on the electromagnetic spectrum, the wave's energy increases.
What is electromagnetic spectrum?The electromagnetic spectrum is a term used to describe the entire range of frequencies of electromagnetic radiation, from the longest wavelength radio waves to the shortest wavelength gamma rays. It is composed of various types of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays. Electromagnetic radiation can travel through space and can be absorbed, reflected, or refracted by various objects. Electromagnetic radiation is used in various fields such as communications, astronomy, medicine, and industry. For example, radio waves are used for communication, microwaves are used for cooking food, infrared radiation is used for medical imaging, visible light is used for sight, ultraviolet radiation is used for disinfection, x-rays are used for medical imaging and gamma rays are used for cancer treatment. Electromagnetic radiation has both electric and magnetic fields that are perpendicular to each other and to the direction of propagation.
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if your brakes fail, the first thing to do is to... choose one a. apply the parking brake. b. shift to a lower gear, then apply the parking brake. c. pump your brakes. d. shift to neutral.
Answer:
apply the parking break
Ava is looking to purchase a new TV. She is looking at one that states it is 55 inches. TV screens are measured by the TV screen diagonal. If the TV screen measures 27 inches high, which is the correct equation to use to find the width, w, of the TV
Hypotenuse squared is equal to height squared plus base squared, which is 3025 - 729 = 2296 b, or 47.9 inches.
How is the hypotenuse located?two equal triangle legs are provided.
Calculate calculated hypotenuse from the sides of a right triangle using the Pythagorean theorem. Sum of squares is represented by the square root c = (a2 + b2).
When using one side and two sides, “ how did you find the hypotenuse?If you own an angle and its opposite side, you may calculate the hypotenuse by dividing the length of the opposing side by sin(). To find the value of the side next to the angle, you can also divide it length by tan().
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the initial velocity of a ball thrown horizontally from the window of a building is 25 m/s. if the ball hits the street below in 3.5 s, then what was the height of the window? (g
If the ball hits the street below in 3.5 s, then 20m was the height of the window.
What is height ?
Height can refer to a person's or an object's vertical extension (how "tall" they are), their vertical location, or both (how "high" a point is). For instance, "That building is 50 metres high," or "An aeroplane flies at a height of about 10,000 metres."
What is velocity ?
The vectorial expression of velocity is the motion of a particle or object with regard to time. The standard unit of velocity magnitude is the metre per second (m/s), which is also known as speed.
Therefore, If the ball hits the street below in 3.5 s, then 20m was the height of the window.
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Anna holds a 14 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm between the lens and the retina.
What is the closest possible distance that she can hold the coin to have it appear in focus?
Express your answer with the appropriate units.
The closest possible distance that she can hold the coin to have it appear in focus is 5.44 cm.
Given:
Magnifier lens power = 14 D
Near point = 25 cm
Distance between lens and retina = 1.7 cm
Diameter of the penny = 19 mm
The focal length is:
f = 1÷D
f = 1 ÷ 14 = 7.1 cm
The image distance is:
v = -(near point - Distance between lens and retina)
v = - (25 - 1.7)
v = - 23.3 cm
From lens formulae:
1/f = 1/u + 1/v
u = vf/(v-f)
u = -23.3×7.1÷(-23.3 - 7.1)
u = 5.44 cm
Hence, the closest possible distance that she can hold the coin to have it appear in focus is 5.44 cm.
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An experiment is performed to test the effects of sleep deprivation on rote memory. In this experiment, the dependent variable is thea. number of hours subjects go without sleep.
b. rote memory scores.
c. number of subjects deprived of sleep in the experimental group.
d. correlation between hours of sleep and fatigue.
In this experiment, the main focus is to test the effects of sleep deprivation on rote memory. Thus option B is the correct answer.
The dependent variable in this experiment is the rote memory scores of the subjects.
Rote memory is the ability to memorize information through repetition, and this is the outcome that the experimenters are trying to measure and observe changes in. The independent variable in this experiment is the number of hours that the subjects go without sleep. This variable is manipulated by the experimenter to induce sleep deprivation in the subjects, and the effects of this manipulation on the dependent variable (rote memory scores) are studied.
The number of subjects deprived of sleep in the experimental group and the correlation between hours of sleep and fatigue are also important factors to consider in the experiment, but they are not dependent variables.
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speedometer readings for a motorcycle at 12-second intervals are given in the table. (a) estimate the distance traveled by the motorcycle during this time period using the velocities at the beginning of the time intervals. (b) give another estimate using the velocities at the end of the time periods. (c) are your estimates in parts (a) and (b) upper and lower estimates? explain.
B) Estimate using the velocities at the end of the time intervals
Total distance traveled = 5 m/s x 12 s + 7 m/s x 12 s + 9 m/s x 12 s = 228 m
What is velocities ?
Velocities are the speeds at which objects move. It is a measure of an object's speed and direction of motion, and is expressed in units such as meters per second (m/s), kilometers per hour (km/h), miles per hour (mph) or knots (kts).
Velocity is a vector quantity, meaning that it has both magnitude and direction. It is important to note that velocity is not the same as speed, which is a scalar quantity and does not have a direction.
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for the second overtone standing wave the node-to-node distance is 8.00 cm . what is the length of the string? express your answer with the appropriate units.
The string is 24 cm long. The node-to-node spacing during the second overtone standing wave is 8.00 cm.
What is standing wave?Two waves with the same frequency and amplitude that are traveling in opposing directions and interfere with one another create a standing wave. It has some places (referred to as nodes) where the amplitude is consistently zero and other spots (referred to as antinodes) where the amplitude fluctuates most intensely.
In order to produce a tone, a standing wave in a musical instrument enables constancy and predictability of the wave. A standing wave is "caught" by resonance in a resonating chamber in wind instruments and in string instruments.
Node to node distance, d is 8 cm.
n = 3
length, L = nλ/2
L = 3 × 8
∴ L = 24 cm
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What type of property can be observed without destroying the substance?
Physical properties such as color, shape, size, weight, odor, melting point, boiling point, and density can be observed without destroying the substance.
What is Physical properties?Physical properties are characteristics of a substance that can be observed and measured without changing the substance's chemical composition. Examples of physical properties include color, density, hardness, melting point, boiling point, and electrical conductivity. These properties are determined through experiments and/or observations. Physical properties can be used to identify and classify a material. They can also be used to differentiate between different forms of the same material, such as different allotropes of the same element. Physical properties are also important for understanding how materials interact with each other and how they respond to the environment.
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: what type of star is several thousand times brighter than the sun with a temperature that is much cooler than the sun? claim: i claim that the star would be classified as a main sequence star. evidence: the main sequence stars go across the hr diagram diagonally. there are main sequence stars that are thousands of times brighter and thousands of times dimmer than the sun. there are main sequence stars at all different temperatures. reasoning: the hr diagram is a model that we use to show how stars compare to each other. there are different types of stars. the type of star depends on how bright the star is, which is called luminosity, and how hot the star is which is shown as temperature in kelvin. write a rebuttal to marissa's conclusion. your rebuttal should include an alternative claim, sufficient evidence, and reasoning that explain why your alternative claim more correctly answers the guiding question. next, critique marissa's cer. what were the strengths and weaknesses of marissa's conclusion?
The most prevalent type of star in the universe is a red dwarf.These stars belong to the main-sequence, but because of their low mass, they are far colder than stars like the Sun.
Which star is many times brighter and hotter than the Sun?The second region contained the record-breaking star, R136a1.The star may have been 320 times as massive as the sun when it was born.It was discovered that several of the stars had surface temperatures over 40,000C, or more than seven time hotter than the sun.
Which sort of star has a 4000K surface temperature and a Sun-like luminosity of 1000 times higher?an ice giant.The sun will start combining helium when it runs out of energy and is unable to longer fusing hydrogen inside its core, shining with a luminance of 1000 L but with a temp of 4000 K.
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a 90.0-kg fullback running east with a speed of 5.00 m/s w is tackled by a 95.0-kg opponent running north with a q/c speed of 3.00 m/s. (a) explain why the successful tackle
The speed of the players just after the successful tackle is 2.9 m/s.
In physics, what is a momentum?The amount of motion a body has is referred to as its momentum. Given that momentum depends on both velocity and the direction of the body's motion, it is quantified as "mass velocity". Because velocity is a vector, momentum is a vector quantity, whereas mass is a scalar quantity. Mass times speed equals momentum.
Ф = tan^-1 (m2 u2/m1u1) = 32.3
m1 u1 = (m1 + m2) v cosФ
v => m1u1/ (m1+m2) x cosФ
=> 90 x 5/(90+95) cos 32.3
=> 2.9 m/s.
What is the explanation for the law of conservation of momentum?The momentum conservation law says as much. Except for the application of an external force, the total momentum of two or more bodies operating on one another in an isolated system is constant. Determining momentum is impossible since it cannot be done.
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an uneven arrangement of electrons and protons on a circular arc of radius with angles what are the magnitude and direction of the net electric field produced at the center of the axis
When there is an uneven arrangement of electrons and protons on a circular arc of radius, the net electric field produced at the center of the axis will depend on the magnitude and distribution of the charges.
The net electric field at the center of the axis is given by the vector sum of the electric fields produced by each individual charge. The magnitude of the net electric field is given by Coulomb's law. The direction of the net electric field is given by the direction of the vector sum of the electric fields.
To calculate the magnitude and direction of the net electric field, it is necessary to know the magnitudes and locations of the charges on the circular arc, as well as the distance from the center of the axis to the charges.
It's also important to note that this is a complex calculation and it would require a detailed knowledge of the charge distribution and the geometry of the circular arc to make a precise calculation.
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Please help me thank you!
The row in the chart that correctly shows the system A, B, C is row 3, gas exchange, nutrients and waste removal.
option C is the correct answer.
What is Digestive system?The digestive system involves in the break down of food into simpler substances in which the body can absorb in form o nutrient.
The absorption of digested food or nutrient takes place in the small intestine found below the stomach.
The respiratory system involves the intake of oxygen for respiration and the removal of carbon dioxide out of the body. This system involves gas exchange in and out of the body.
The circulatory system transports oxygen, digested food ( nutrients ), water and waste materials around the body.
The waste material like urine is removed from the body through the urinary tract.
Thus, we can conclude that the first system given is for gas exchange, the second system given is for nutrient absorption, and the third system given is for removal of waste materials.
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The motion of a particle given by x(t)=(25cm)cos(14t) , where t is in s. What is the first time the kinetic energy is twice the potential energy?
The first time the kinetic energy is twice the potential energy will be 0.04 sec.
Kinetic energy is the energy an object has as a result of motion. In order to accelerate an object, a force must be applied.To apply a force, we must exert effort. Energy is transmitted to the object once the work is accomplished, at which point it moves at a new, constant speed.
We know,
x(t) = A cos ωt
ω= 14
A = 25 cm
v(t) = [tex]\frac{Dx}{dt}[/tex]
= 24*14*sin(14t)
Potential energy= 0.5 ω² x² m
Kinetic Energy = 0.5 m v²
from condition : K.E = 2P.E
so, v(t)² = 2ω²x(t)²
solving t= 0.04 sec
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While riding a bike, you convert chemical energy into kinetic energy. After pedaling for a certain time you have given yourself and the bike (a combined mass of 78 kg) a kinetic energy of 9,011 Joules. How fast are you going at that moment in m/s?
According to the question of kinetic energy, 15.4m/s fast you are going at that moment in m/s.
What is kinetic energy?
Kinetic energy is a form of energy that is associated with the motion of an object. It is the energy an object has due to its motion. Kinetic energy is present in all moving objects and is calculated by taking the mass of the object and multiplying it by the square of its velocity. Kinetic energy is a form of energy that can be transformed into other forms. For example, when a ball is dropped and bounces off the ground, it converts its kinetic energy into potential energy. Similarly, when an object is moving and then comes to a stop, its kinetic energy is converted into heat energy.
The kinetic energy can be calculated by the equation KE = 1/2mv2.
Therefore, v = √(2KE/m) = √(2*9011/78) = 15.4 m/s.
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In 1995, Karine Dubouchet of France reached a record speed in downhill skiing. If Dubouchet’s mass was 51 kg, her kinetic energy would have been 99600 J. What was her speed?
The kinetic energy of Karine Dubouchet of France is 99600, her mass was 51kg. So, her speed at that time will be 62.49m/s.
What is Kinetic energy?Kinetic energy is the energy which is present in the body of an object which is under motion. This energy is converted into potential energy when the object comes at rest. The SI unit of Kinetic energy is Joules (J). It is directly proportional to the mass and velocity of the object.
KE = 1/2 × m × v²
where, KE = Kinetic energy of the body,
m = mass of the body,
v = velocity of the body
Here, the Kinetic Energy is 99600 Joules and mass is 51 kg. Therefore, the speed or velocity of the object can be calculated as:
KE = 1/2 × m × v²
2KE/m = v²
√2KE/m = v
√2×99600/51 = v
√199,200/51 = v
√3,905.9 = v
v = 62.49m/s
Therefore, the speed or velocity of Karine Dubouchet is 62.49m/s.
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if a thin thread is placed between a screen and a bright source of light, a pattern of parallel dark and bright fringes appears on the screen. the phenomenon best explaining the formation of this pattern is:
If a thin thread is placed between a screen and a bright source of light, a pattern of of parallel light and dark strips appears on the screen. This phenomenon is called the diffraction of light.
When a thin thread comes in the path of light waves, it obstructs the upfront of the light wave causing the change in the phase difference of the wave. Overlapping of these different waves of different phase differences cause the dark and light pattern appearance on the wall. On the other hand, thin thread also cast a thin shadow due to the obstruction in the path of light. Pattern on the wall depends on the phase difference in the wave-upfront.
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A 3.7 kg block of wood sits on a frictionless table. A 3.0 g bullet, fired horizontally at a speed of 450 m/s , goes completely through the block, emerging at a speed of 230 m/s .What is the speed of the block immediately after the bullet exits?
The speed of the block immediately after the billet exist is 0.346m/s.
Describe speed.An object's speed is how quickly it moves through space. When moving quickly, an object can cover a large distance in a short period of time. As opposed to this, a slow-moving object travels a relatively short distance in the same amount of time. A thing that isn't moving at all is said to have zero speed.
Mass of wood = 3.7kg
Initial speed u₁=0
Mass of bullet is = 3x10⁻³kg
Initial speed of block =450m/s
Final speed of block v₂=230m/s
According to linear momentum
Initial linear momentum = Final linear momentum
Mu₁+mu₂ =Mv₁+ mv₂
Mx0 + 3x10⁻³ x450 = 3.7v₁ + 3x 10⁻³ x230
1.35-0.069 = 3.7v₁
1.281 = 3.7v₁
v₁ = 0.346m/s
The speed of the block immediately after the billet exist is 0.346m/s.
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Cadir is basting a roast turkey with a meat baster that creates a pressure of 9.980X10^4Pa when the plastic bulb is squueesed and released. If turkey juice rises 0.0900 m up the tube of the baster, what is the density of the juice?
The density of the juice is 113,151.9 kg/m³.
What is the density of the juice?
The density of the juice is calculated by applying the following formula.
The formula for the pressure of the juice is given as;
P = ρgh
ρ = P / gh
where;
ρ is the density of the juiceP is the pressure of the juiceh is the height of rise of the juiceg is acceleration due to gravityThe density of the juice is calculated as follows;
ρ = P / gh
ρ = ( 9.98 x 10⁴ Pa ) / ( 9.8 m/s² x 0.09 m )
ρ = 113,151.9 kg/m³
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Find the output force exerted by a moveable pulley if the input force is 50 N.
Please give the equation.
Answer:
Because the mechanical advatage of a movable pulley is always two you multipy the input force times two. So 50 * 2 = 100N
