A covalent bond forms between two atoms that can share a pair
of valence electrons, while a hydrogen bond forms between two
atoms that can form ions.
When two atoms share valence electrons, do covalent bonds form?
An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
Not a covalent link to a hydrogen atom, hydrogen bonding is an unique kind of dipole-dipole interaction between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.
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What are the magnitude Δ and angle of the change in velocity if the initial velocity is 65.0 m/s south and the final velocity is 20.0 m/s west? Let the angle be measured relative to the east direction (e.g., =90∘ means Δ⃗ points north, =180∘ means Δ⃗ points west, etc.).
Answer:
∆ = 68.0∠ = 107.1°Explanation:
You want the magnitude and direction of the change in velocity from 65.0 m/s south to 20.0 m/s west.
ChangeThe change in velocity can be represented by a vector from the initial velocity to the final velocity as shown in the attachment. The magnitude and direction of it can be found using the usual tools for solving triangles.
MagnitudeThe magnitude of the change is the hypotenuse of a right triangle with legs 20 and 65. Its value is ...
∆ = √(20² +65²) = √4625 ≈ 68.007 . . . . m/s
The magnitude of the velocity change is ∆ = 68.0 m/s.
DirectionAs the diagram shows, the direction of the change is west of north by an angle θ that satisfies ...
tan(θ) = 20/65
θ = arctan(20/65) ≈ 17.1027°
The direction of the change measured from east is 90° +17.1° = 107.1°.
The angle of the velocity change is about 107.1°.
__
Additional comment
These calculations are handled neatly by a vector calculator, as shown in the second attachment.
Prove that AxB = B.A
Unless A=B or unless either A or B is the empty set, AxB does not equal BxA. Students typically have no trouble understanding this because we define a cartesian product as an ordered pair, which implies that order would be important.
What is the parameter for solving cartesian product?A plane's cartesian form is denoted by the formula ax + by + cz = d, where a, b, and c are the direction cosines normal to the plane and d is the distance from the origin to the plane.
If and only if the matching initial elements in both ordered pairs are the same, two ordered pairs are said to be equivalent. (ii) There will be mn elements in A B if there are m elements in A and n elements in B. This means that n(A B) if n(A) = m and n(B) = n.
Therefore, When the inner inverse fulfils P R (B ) B (A B) = 0 and (A B) B P R (B) = 0, it is implied that is closed and is the general solution.
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During the vietnam war, journalists _____. Select two choices. Called the military's press briefings "five o'clock follies" accepted the u. S. Government's justification for the war could not interview american soldiers while serving did not witness any combat on a firsthand basis.
During the Vietnam War, journalists often referred to the military's press briefings as "five o'clock follies" because they felt that the information provided was often incomplete or misleading.
The two choices that are correct are:
•Called the military's press briefings "five o'clock follies"
•Did not witness any combat on a firsthand basis.
. Additionally, due to the dangers of the conflict, many journalists did not have the opportunity to witness combat on a firsthand basis.
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The figure showed a thin rod of length L and charge Q.
Find an expression for the electric potential a distance z away from the center of rod on the line that bisects the rod.
Give your answer in terms of L, Q, z and appropriate constants.
Expression for the electric potential a distance z away from the center of rod on the line that bisects the rod is [tex]V = k * Q / L * \int\limits {cos\theta / z \sqrt{(1 + L^2/4z^2 * tan^2\theta)} d\theta} \, dx[/tex].
The electric potential at a distance z from a point charge Q is given by:
V = k * Q / r
here
k is Coulomb constant and
r is distance from the point charge to the point.
For a thin rod of length L and charge Q, we can model it as a line of charge with linear charge density λ = Q/L. The electric potential at a distance z away from the center of the rod on the line that bisects the rod can be found by breaking the rod into infinitesimal charge elements and integrating the electric potential due to each element over the length of the rod.
Let's consider a small element of length dx located at a distance x from the center of the rod:-
[tex]dQ = \lambda * dx = Q/L * dx[/tex]
The displacement element to pt.:-
[tex]r = \sqrt{(x^2 + z^2)}[/tex]
The electric potential due to this element is:
[tex]dV = k * dQ / r = k * Q/L * dx / \sqrt{(x^2 + z^2)}[/tex]
Integrating this expression over the length of the rod, we get the total electric potential at a distance z away from the center of the rod on the line that bisects the rod:
[tex]V = \int\limits^(^-^L^/^2^)_L_/_2 {k * Q/L * dx / √\sqrt{(x^2 + z^2)}} \, dx[/tex]
To evaluate this integral,
[tex]u = x^2 + z^2, du/dx = 2x dx[/tex],
This can be further simplified:-
[tex]u = z^2 * tan^2\theta + L^2/4 * sec^2\theta[/tex]
[tex]V = k * Q / L * \int\limits {cos\theta / z \sqrt{(1 + L^2/4z^2 * tan^2\theta)} d\theta} \, dx[/tex]
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20. You accidentally throw your car keys horizontally at 6.0 m/s from a cliff 42 m high. How far from the base of the cliff should you look for your keys?
The keys will land 19.32 meters away from the base of the cliff.
How the solution was obtainedAssuming that there is no air resistance, the motion of the keys can be described using the equations of motion for constant acceleration.
The initial horizontal velocity of the keys is 6.0 m/s, and the vertical velocity is zero. The acceleration due to gravity is 9.8 m/s^2, and it acts vertically downwards.
The time taken for the keys to fall from the top of the cliff to the ground can be found using the equation:
h = 1/2 * g * t^2
where h is the height of the cliff (42 m), g is the acceleration due to gravity (9.8 m/s^2), and t is the time taken.
Rearranging this equation to solve for t, we get:
t =√(2h/g)
t =√(2*42/9.8)
t = 3.22 s
During this time, the keys will have travelled a horizontal distance equal to their initial velocity multiplied by the time taken:
d = v * t
d = 6.0 * 3.22
d = 19.32 m
Therefore, the keys will land 19.32 meters away from the base of the cliff.
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Again, combining the heat equations with the heat flow equation, we find that the difference in the temperature between the sample (or Polly) and the cold bath followed an exponential decay, i.e., Tdir = (constant) - Setting time equal to 0 tells us that the prefactor (constant) out front simply is the initial temperature difference. Knowing the decay constant from the previous question and the temperature difference at some later time, then, we can find the time it takes for the difference between the sample's (Polly's) internal temperature and the bath's temperature to reach some specific value. According to the data you took at the (possible) crime scene and your answer to the previous problem, determine how many hours (to the nearest hour) Polly has been deceased (in hours, to the nearest hour)? Again, Polly's and the water bath's initial temperatures were 37°C and 2°C, respectively, and the final temperatures you measured were 13°C and 7°C. Hence, you could determine if foul play may have been involved (say, someone had been seen leaving Polly's apartment a certain time before her body was discovered). 18.703 As you are assisting in the investigation, you notice that Polly's apartment has maintained a cozy temperature even though her heat had been turned off and it's a cold winter's day. (Could this be another clue?) One explanation is that her apartment has nice double pane windows, consisting of two glass panes that are each 4-mm thick sandwiching a well-sealed air gap 6-mm thick. In "steady state", the rate that heat flows through a glass pane equals the rate that heat flows through the air gap in the double pane window (otherwise there would be a net heat flow into the air or window, changing its temperature -- whatever flows into one of these materials must flow out to maintain a given temperature). Since the thermal conductivity of still air (0.025 W/(mºC)] is much smaller than the thermal conductivity of glass (0.80 W/(m°C)], the temperature difference across the double pane window is almost entirely over the air gap. (Again, in this steady state, the rate of heat flow through the glass and air are the same for the double pane window, so if the conductivity of air is much smaller than that of glass, the temperature difference across the air must be much larger than that across the glass for these windows.) Considering this, what is the ratio of the rate of heat flow through a cheap window with a single pane of glass 4-mm thick compared to a nicer double pane window with an air gap of 6 mm if the temperature difference across them is the same (and they have the same areas)? Neglect heat leaks at the edges of the windows.
the ratio between the rate of heat flow through a cheap window with a single pane of glass that is only 4 mm thick to a nicer double pane window with an air gap of 6 mm is 76.6667.
K[tex]_{glass}[/tex]=0.80 W/m°C
K[tex]_{air}[/tex]=0.025 W/m°C
Q=[tex]\frac{\triangle T}{R_{Th} }[/tex]
(R[tex]_{Th}[/tex])[tex]_{double pane}[/tex]×Q[tex]_{double pane}[/tex]=(R[tex]_{Th}[/tex])[tex]_{single pane}[/tex]×Q[tex]_{single pane}[/tex]
(R[tex]_{Th}[/tex])[tex]_{double pane}[/tex]=∑[tex]\frac{l}{KA}[/tex]
= [tex]\frac{3}{0.8A} +\frac{7}{0.025 A}+\frac{3}{0.8 A}\\[/tex]
=[tex]\frac{287.5}{A}[/tex]
(R[tex]_{Th}[/tex])[tex]_{single pane}[/tex]=[tex]\frac{3}{0.8A}[/tex]=[tex]\frac{3.75}{A}[/tex]
[tex]\frac{Q_{single pane} }{Q_{double pane}} =\frac{R_{Th}_{double pane} }{R_{Th}_{single pane}}[/tex]
= 76.6667
Heat flow, also known as heat transfer, is the movement of thermal energy from a region of higher temperature to a region of lower temperature. This occurs due to the random motion of atoms and molecules within a material. There are three main mechanisms of heat flow: conduction, convection, and radiation. Conduction is the transfer of heat through a material by direct contact, while convection involves the movement of a fluid (such as air or water) due to temperature differences. Radiation is the transfer of heat through electromagnetic waves, such as from the sun or a fire. Heat flow is a fundamental concept in thermodynamics and plays a critical role in many fields, including engineering, physics, chemistry, and biology.
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fill in the balance equation below with the name of missing compuod. The answer the question that follow in the space provided
____ ____ sunlight ____ ___ ____
The answer to the question that follows in the space provided is
carbon dioxide + water + sunlight = glucose + oxygen.
What is photosynthesis?Green plants produce their food in the presence of sunlight during photosynthesis. The process is only done by autotrophs.
They use carbon dioxide and water, which are inorganic components from the environment, to create glucose, and oxygen gas is released into the atmosphere.
Carbon dioxide + water → Glucose + Oxygen
Therefore, the correct option is
1 carbon dioxide2 water3 glucose4 oxygen gasTo learn more about photosynthesis, refer to the link:
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Two opposite charges of the same magnitude Q = 2x10^-7c are separated by a distance of 15.0cm. What is the magnitude and direction of the force acting on an electron placed at the midpoint
The direction of the force is along the line joining the two charges, and its magnitude is approximately 1.44 x 10^-12 N.
What is magnitude?Magnitude can be defined as the maximum extent of size and the direction of an object.
The force on the electron can be found using Coulomb's law:
F = k * (q1 * q2) / r^2
where
k is Coulomb's constant (k = 9 x 10^9 N*m^2/C^2)q1 and q2 are the magnitudes of the two charges r is the distance between themF is the magnitude of the forceIn this case, the two charges have the same magnitude Q = 2 x 10^-7 C, so we can write:
F = k * [(Q * -Q) / (0.15 m)^2]
where the negative sign for one of the charges indicates that it has the opposite charge to the other. Simplifying this expression, we get:
F = k * (Q^2 / 0.0225)
F = (9 x 10^9 N*m^2/C^2) * (2 x 10^-7 C)^2 / 0.0225
F ≈ 1.44 x 10^-12 N
Therefore, the direction of the force is along the line joining the two charges, and its magnitude is approximately 1.44 x 10^-12 N.
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When Marcus goes to play golf, he steps up to his ball and swings the club without thinking at all about his technique. Due to years of practice and repetition Marcus has most likely begun to use __________ processes when swinging his golf club.
Due to years of practice and repetition, Marcus has most likely begun to use unconscious processes when swinging his golf club.
What are unconscious processes?The unconscious is the process that proceeds outside the person's awareness and plays a major role in directing thoughts, feelings, behavior, and mental illness.
When Marcus goes to play golf, he steps up to his ball and swings the club without thinking at all about his technique, so the signs about the unconscious process.
Therefore, Marcus has most likely begun to use unconscious processes when swinging his golf club.
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8. In which of the following situations is the kinetic energy of the object decreasing?
A. A sphere is dropped from a building.
B. A satellite moving is a circular motion around the earth.
C. A baseball is heading upward after being thrown at an angle.
D. An elevator is moving upward at a constant velocity
The answer is option C. A baseball is heading upward after being thrown at an angle.
What is kinetic energy?Kinetic energy is a type of energy associated with motion. It is defined as the energy an object possesses due to its motion, and is dependent on both the object's mass and its velocity. The formula for kinetic energy is KE = 1/2 mv^2, where m is the mass of the object and v is its velocity.
Kinetic energy can be transferred between objects, and is often involved in collisions and other interactions. For example, when a moving object collides with another object, some of its kinetic energy may be transferred to the second object. Kinetic energy is an important concept in physics and is used in many real-world applications, such as in the design of vehicles, machines, and athletic equipment.
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A box with weight of 10000 pounds is held 25 miles above the Earth. What is the box's potential
energy in kip-feet? one kip = 1000 pounds (Remember that weight in pounds already accounts for
acceleration due to gravity.)
The potential energy of the box is 4180 kip-ft.
What is potential energy?Potential energy is described as the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
The potential energy of an object can be calculated using the formula:
PE = mgh
In the scenario,
the mass of the box is m = 10000 pounds and
the height above the ground is h = 25 miles = 25 * 5280 feet = 132000 feet.
The acceleration due to gravity is g = 32.2 ft/s^2.
Substituting these values into the formula, wehave:
PE = mgh = 10000 * 32.2 * 132000 = 4.18 x 10^8 ft-lb
Converting this to kip-ft,
PE = 4.18 x 10^8 ft-lb / 1000 = 4180 kip-ft
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1. Which of the resistors are in parallel connection? Which of the resistors are in series connection?
Answer:
Explanation: In a series circuit, the output current of the first resistor flows into the input of the second resistor; therefore, the current is the same in each resistor. In a parallel circuit, all of the resistor leads on one side of the resistors are connected together and all the leads on the other side are connected together.
A wheel is formed from a hoop of mass 2.6 kg
and seven equally spaced spokes, each of mass
0.11 kg. The hoop’s radius is the length
0.73 m of each spoke.
0.11 kg
2.6 kg
0.73 m
Find the moment of inertia of the wheel
about an axis through its center and perpendicular to the plane of the wheel.
Answer in units of kg · m2
. Answer in units
of kg · m2
.
The moment of inertia of the wheel about an axis through its center and perpendicular to the plane of the wheel is 2.09 kg·m^2.
What is the parallel axis theorem?The moment of inertia of the wheel about an axis through its center and perpendicular to the plane of the wheel can be calculated by using the parallel axis theorem, which states that the moment of inertia of a rigid body about any axis is equal to the moment of inertia about a parallel axis through the center of mass plus the product of the mass and the square of the distance between the two axes.
Here in the Question,
First, we need to find the moment of inertia of the hoop about an axis through its center and perpendicular to the plane of the hoop. This is a well-known result from basic mechanics and is given by:
I_hoop = 1/2 * m_hoop * r^2
where m_hoop is the mass of the hoop and r is its radius. Substituting the given values, we get:
I_hoop = 1/2 * 2.6 kg * (0.73 m)^2 = 1.26 kg·m^2
Next, we need to find the moment of inertia of a single spoke about an axis through its center and perpendicular to its length. This is also a well-known result from basic mechanics and is given by:
I_spoke = 1/12 * m_spoke * L^2
where m_spoke is the mass of the spoke and L is its length. Since the spokes are equally spaced around the hoop, we can consider a single spoke and multiply its moment of inertia by 7 to account for all the spokes. Substituting the given values, we get:
I_spoke = 1/12 * 0.11 kg * (0.73 m)^2 = 0.005 kg·m^2
Therefore, the moment of inertia of all the spokes combined is:
I_spokes = 7 * I_spoke = 0.035 kg·m^2
Finally, we can use the parallel axis theorem to find the moment of inertia of the entire wheel about an axis through its center and perpendicular to the plane of the wheel:
I_wheel = I_hoop + I_spokes + 7 * m_spoke * r^2
Substituting the given values, we get:
I_wheel = 1.26 kg·m^2 + 0.035 kg·m^2 + 7 * 0.11 kg * (0.73 m)^2 = 2.09 kg·m^2
Therefore, The wheel's moment of inertia about an axis passing through its center and perpendicular to its plane is 2.09 kg·m^2.
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____help the body change food into energy and repair and replace old and damaged parts.
Answer: Vitamins
Explanation:
1.2 Determine the total displacement of the diagram in FIGURE 1. 123 m 20⁰ (3) 72 m
The total displacement of the diagram in the velocity-time graph is 55 m.
What is the total displacement?To find total displacement from a velocity-time graph, the area under the curve of the graph is calculated.
Considering the given figure:
The area under the velocity-time graph is composed of two triangles ABF & DCE having area A₁ & A₂ respectively, and a rectangle BEIF having area A3.
The area of A₁ = (2- 0) × (5 - 0)/2 = 5 m
The area of A₂ = (10 - 5) × (10 - 6)/2 = 10 m
The area of A₃ = (5 - 0) * (10 - 2) = 40 m
The total area under the curve = A₁ + A₂ + A₃
The total area under the curve = 5 + 10 + 40 =
The total area under the curve = 55 m
Therefore, the total displacement is 55 m.
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QUESTION 3 Consider a block of mass 6 kg on a rough plane inclined at 25° to the horizontall A force, F of magnitude 37,173 N is applied to this block to keep it moving at a constant velocity 6 kg 25 what is the normal force
The normal force is 53.3 N.
What is the normal force on an object?We have to note that the force that is acting on the object may be a single force or a system of forces. In this case, the force that is acting on the object would have many components including the normal force.
You must note that the normal force is the force that in a direction that is opposite to the weight of the object but does have the same magnitude as the weight of the object.
Thus we can see that the normal force is obtained from;
R = mgcosθ
m = mass
g = acceleration due to gravity
θ = angle
R = 6 * 9.8 * cos 25
R = 53.3 N
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A ball is thrown toward a cliff of height h with a speed of 33 m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 4.0 s later.
Answer: I am assuming you're asking for the cliff height, which is 24M
We can use the kinematic equations to find the horizontal and vertical components of the ball's velocity and its final position.
The initial velocity components are:
v_x = 33 m/s * cos(60∘) = 28.6 m/s
v_y = 33 m/s * sin(60∘) = 33 * √3/2 m/s
The displacement components can be found using the kinematic equation:
x = v_x * t = 28.6 m/s * 4.0 s = 114.4 m
y = v_y * t - 0.5 * g * t^2 = 33 * √3/2 m/s * 4.0 s - 0.5 * 9.8 m/s^2 * (4.0 s)^2 = 102.4 m - 78.4 m = 24.0 m
The ball lands on the edge of the cliff, so its height must be equal to h, or:
y = h
24.0 m = h
So, the height of the cliff is 24.0 m.
Find the momentum of a 0.0231 kg bullet fired at 621 m/s.*
A.0.0269 kg·m/s
B.14,200 kg·m/s
C.26.9 kg·m/s
D. 14.3 kg·m/s
Answer:
The momentum of a 0.0231 kg bullet fired at 621 m/s is calculated by multiplying the mass of the bullet by its velocity:0.0231 kg * 621 m/s = 14.3 kg·m/sSo the answer is D. 14.3 kg·m/s.
Explanation:
Formula for momentum:
[tex]p=mv[/tex]
momentum(measured in kg*m/s) = mass(measured in kg) * velocity(measured in m/s)
__________________________________________________________
Given:
[tex]m=0.0231kg[/tex]
[tex]v=621m/s[/tex]
[tex]p=?[/tex]
__________________________________________________________
Finding momentum:
[tex]p=mv[/tex]
[tex]p=0.0231\times621[/tex]
[tex]p=14.3kg*m/s[/tex]
__________________________________________________________
Answer:
[tex]\fbox{Option D}[/tex]
12. A truck travelling at 110 km/h has to cover a distance of 640 km in the next 6 hours. Will the driver be on time if he can hold his current speed? (4 marks)
Answer:
calculate the expected time of arrival, we need to divide the total distance by the speed of the truck.
In this case, the expected time of arrival would be:
640 km ÷ 110 km/h = 5.82 hours
So the driver should be able to arrive at the destination within 6 hours if he can hold his current speed.
The first active volcano observed outside the Earth was discovered in 1979 on Io, one of the moons of Jupiter. The volcano was observed to be ejecting material to a height of about 3.00×105m
Given that the acceleration of gravity on Io is 1.80m/s2 find the initial velocity of the ejected material.
The material that was thrown out had an approximate initial velocity of 1.50-10⁵ m/s.
How can the ejected material's initial velocity be determined?The following equation can be used to determine the ejected material's initial velocity under gravity's constant acceleration:
y is equal to v₀ x t x (1/2) a x t₂, where:
The values for y, a, and t are as follows: y is the vertical displacement (height) of the ejected material (3.00 10⁵ m); a is the acceleration caused by gravity on Io (1.80 m/s²); t is the time it takes for the ejected material to reach its maximum height (let's assume it is equal to 2 seconds for simplicity).
3.00×10⁵ m = v₀ ×2 s + (1/2) × 1.80 m/s² × (2 s)²
3.00×10⁵ m = v₀ × 2 s + 1.80 m/s² × 4 s²
3.00×10⁵ m = v₀× 2 s + 7.2 m/s²
v₀ = (3.00×105 m - 7.2 m/s²) / 2 s
v₀ = (3.00×105 m - 7.2 m/s²) / 2 s
v₀ = 1.50×10⁵ m/s
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Quick someone please help this was already due and I need to go to bed plssssssss
The number of amino acids different between sequence 1 and sequence 2 is 2.
The translations of sequence 1 and sequence 2 are different because:
Sequence 1 and 2 have different nucleotide sequencesWhat are nucleotides?Nucleotides are the building blocks of nucleic acids, such as DNA and RNA. They consist of a nitrogenous base, a sugar molecule (ribose or deoxyribose), and a phosphate group. The nitrogenous bases in nucleotides can be adenine, guanine, cytosine, or thymine (in DNA) or adenine, guanine, cytosine, and uracil (in RNA).
Nucleotides are linked together to form long chains, which make up the backbone of nucleic acids. The sequence of nitrogenous bases in nucleotides determines the genetic information stored in DNA.
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Car A is driving 21.4 m/s in the positive x-direction according to an observer standing stationary on the side of the road. Car B is driving on the same road with a velocity of 27.4 m/s, as observed by a passenger in Car A. What is Car B's velocity as observed by the person on the side of the road?
Car B's velocity as observed by the person on the side of the road is -6.0 m/s, which means that it is moving in the negative x-direction.
explain about velocity ?
Velocity is a physical quantity that describes the rate of change of an object's position with respect to time. In other words, it is the speed and direction of an object's motion. Velocity is a vector quantity, which means that it has both a magnitude (or size) and a direction.
the relative velocity formula, which gives the velocity of one object as observed by another object or observer:
velocity of B with respect to observer = velocity of B with respect to A + velocity of A with respect to observer
In this problem, we have:
velocity of A with respect to observer = +21.4 m/s (positive because it is in the positive x-direction)
velocity of B with respect to A = -27.4 m/s (negative because it is in the opposite direction to A's velocity)
(Note that we use a negative sign for the velocity of B with respect to A because they are moving in opposite directions.)
Using the formula, we get:
velocity of B with respect to observer = -27.4 m/s + 21.4 m/s = -6.0 m/s
Therefore, Car B's velocity as observed by the person on the side of the road is -6.0 m/s, which means that it is moving in the negative x-direction.
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A ball strikes the floor for 0.0105 s and experiences a change in momentum of 1.52 kg·m/s. What is the force experienced by the ball?
A.) 1.60N
B.)144.76N
C.)23.82N
D.)0.016N
Pic is attached below
The force experienced by an object is 144.76 N.
O\ption B is correct.
What is force?A force is described as an influence that can change the motion of an object or that can cause an object with mass to change its velocity
The force can be calculated using the equation of force = change in momentum / time.
So, force = 1.52 kg·m/s / 0.0105 s = 145 N
Therefore, the answer is 144.76 N.
Some types of force available includes the following:
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A simple circuit contains a 9 V battery connected with wires to a small light bulb. If the current through the bulb is 0.025 A, what is the resistance of the bulb?
Group of answer choices
360 ohms
15 ohms
127 ohms
0.225 ohms
Answer:
[tex]\huge\boxed{\sf R = 360\ ohms}[/tex]
Explanation:
Given data:Potential Difference = V = 9 V
Current = I = 0.025 A
Required:Resistance = R = ?
Formula:V = IR (Ohm's Law)
Solution:V = IR
Divide I to both sides
[tex]\displaystyle \frac{V}{I} = R[/tex]
Put the given data
9/0.025 = R
360 ohms = R
OR
R = 360 ohms[tex]\rule[225]{225}{2}[/tex]
At the end of the day, you remember that pulling up on an object will make it easier to slide the object. Using this knowledge you decide to move your 3000 N Grand Piano using a rope. You pull the rope so that it provides an upward force of 900 N and a horizontal force of 1600 N. What is the coefficient of kinetic friction if the piano is being bulled at a constant speed?
The coefficient of kinetic friction is approximately 0.533.
What is the coefficient of kinetic friction?
To find the coefficient of kinetic friction, we can use the equation of the force of friction, which is given by:
f_friction = friction_coefficient x f_norm
where;
f_friction is the force of friction, friction_coefficient is the coefficient of kinetic friction, and f_norm is the normal force.Since the piano is being pulled at a constant speed, the net force on the piano must be zero, which means that the sum of the forces must be equal to zero:
f_net = f_horizontal - f_friction = 0
friction_coefficient = f_friction / f_norm
= (f_horizontal) / (f_norm)
= (1600 N) / (3000 N) = 0.533
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A 1500 kg car traveling east at 20 m/s collides with a moving 2500 kg truck moving 30 m/s west.. After they collide, the two interlock and move together. What was the final velocity of the truck? (Hint-momentum is a vector and direction matters, use + or - values as appropriate)* A. 11.25 m/s west B. 11.25 m/s east C. 32.6 m/s east D. 32.6 m/s west
The final velocity of the truck after the collision is -11.25 m/s.
A. 11.25 m/s west How to find the final velocity?In this collision, the total momentum of the system before the collision is equal to the total momentum of the system after the collision, since momentum is conserved. The total momentum of the system before the collision can be found by adding up the momenta of the car and truck.
The momentum of the car is given by:
= mass of car * velocity of car
= 1500 kg * 20 m/s = 30000 kg m/s (east)
The momentum of the truck is given by:
= mass of truck * velocity of truck
= 2500 kg * -30 m/s
= -75000 kg m/s (west)
The total momentum of the system before the collision is given by:
30000 kg m/s + (-75000 kg m/s) = -45000 kg m/s
The total mass of the system is given by:
total mass = mass of car + mass of truck = 1500 kg + 2500 kg = 4000 kg
The final velocity of the system is given by:
final velocity = -45000 kg m/s / 4000 kg = -11.25 m/s
Since the final velocity is negative, it means that the system is moving west, which is the direction of the truck's initial velocity.
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There are various stages in the formation of coal as heat and pressure are increased and moisture content is decreased. These stages, in order, are
bituminous, peat, lignite, anthracite
bituminous, peat, lignite, anthracite
A
peat, lignite, bituminous, anthracite
peat, lignite, bituminous, anthracite
B
peat, lignite, anthracite, bituminous
peat, lignite, anthracite, bituminous
C
lignite, bituminous, anthracite, peat
lignite, bituminous, anthracite, peat
D
anthracite, bituminous, peat, lignite
Correct order in formation of coal as heat and pressure are increased and moisture content is decreased is (B) peat, lignite, bituminous, anthracite.
Peat is the first stage in the formation of coal, and is made up of partially decomposed plant material with a high moisture content. As heat and pressure are increased, the moisture content decreases and the plant material becomes more compressed, leading to the formation of lignite. Lignite is a low-grade coal with a relatively low carbon content, and is often referred to as brown coal.
With further increases in heat and pressure, lignite is transformed into bituminous coal, which has a higher carbon content and is often used for electricity generation. Finally, with even greater heat and pressure, bituminous coal is transformed into anthracite, which is the highest grade of coal and has the highest carbon content.
The stages of coal formation are important to understand because different types of coal have different uses and properties. For example, anthracite is often used for heating because it burns very cleanly and efficiently, while bituminous coal is often used for electricity generation because it has a higher energy content.
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What is the gauge pressure in atm at point p , where the needle meets the wider body of the syringe? the pressure at the exit of the needle is 1. 0 atm.
The water gauge pressure at location P is;
P p = 104525 Pa
We have been provided;
L = 4 cm = 0.04 m needle length
Water's viscosity; = 1 10(-3) Pa
r = 1 mm = 0.001 m Radius
v = 10 m/s is the speed.
The flow rate via a cylindrical pipe may be calculated using Poiseuille's equation for viscous liquid flow.
Q = (ΔP•πr⁴)/(8ηL)
Flow rate is now also written as;
Q = πr²v
Thus;
πr²v = (ΔP•πr⁴)/(8ηL)
This boils down to;
v = (ΔP•r²)/(8ηL)
Inserting the necessary values;
10 = (ΔP × 0.001²)/(8 × 10^(-3) × 0.04)
ΔP = (10 × 8 × 10^(-3) × 0.04)/(0.001²)
ΔP = 3200 Pa
This implies that;
P atm - P p = P
Where;
P p is the water gauge pressure at point P.
P atm is atmospheric pressure, which equals 101325 Pa.
Thus;
P p - 101325 = 3200
P p = 101325 + 3200
P p = 104525 Pa
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When a transverse wave travels through a medium, which of the following is TRUE?
A. the medium determines the wavelength
B. the medium determines the amplitude of the wave vibrations.
C. vibrations are parallel to the direction the wave travels.
D. the medium determines the wave frequency
E. vibrations are perpendicular to the direction the wave travels
The medium determines the amplitude of the wave vibrations is the correct option (B) .
What is wave ?
Laminar and transverse waves are the two types of waves. Longitudinal waves are similar to those of sound in that they alternate between compressions and rarefactions in a medium, much like transverse waves in that the surface of the medium rises and falls.
What is transverse wave ?
The term "transverse wave" refers to motion in which all wave points oscillate along trajectories that are perpendicular to the wave's forward velocity. Transverse waves include electromagnetic (such as radio and light) and seismic S (secondary) waves. Surface ripples on water are another example.
In a transverse wave, the medium's particles vibrate up and down perpendicular to the wave's direction. In a longitudinal wave, the medium's particles vibrate back and forth parallel to the wave's direction.
Therefore, medium determines the amplitude of the wave vibrations is the correct option (B) .
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Two charged objects are separated a distance d as shown. The angle between the line joining the objects and the horizontal is 30°. Consider the (x,y) coordinate system with origin at the location of object 2. (Part a) Calculate 7 2,1, the position vector of object 1 measured from object 2. Express your answer in terms of hati for i, hatj for j, and d as needed. Remember that the argument of sin and cos in answer boxes needs to be entered in radians. 72,1 = (Part b) Calculate r 2,1, the unit vector pointing in the direction from object 2 to object 1. Express your answer in terms of hati for i, ha and d as needed. tj for i † 2,1 = (Part c) Calculate the force on object 1 due to the interaction with object 2. Express your answer in terms of hati for i, hatj for j, d, k, q_1 for qı and q_2 for 22 as needed. 72,1 = Submit You have used 0 of 10 attempts Save
Two charged objects are separated a distance d, the position vector of the object 1 with respect to the object 2 is P21 = d/2(√3i -j).
It is assumed in the problem that the origin is taken into account when determining the position of object 2. As a result, we may decompose the position vector of object 1 into its x and y components.
So, we can see from the diagram that the position vector's horizontal component is dcos30. This component is known as the x component because it lines up with the positive x axis. Hence, x=dcos30. Once more, dsin30 is the vertical component of the position vector. This component is known as the y component because it is congruent with the negative y axis. Hence, y=dsin30.
As a result, the position vector can be expressed as,
⇒P21=xi^+y(−j^)
The values P21=dcos30i+dsin30(j) are substituted
Now, the values of cos30 are 3-1/2 and sin30 are 12.
In order to substitute the values, we obtain P21=3-2di12dj.
Now, if we take the common, we get P21 = d/2(√3i -j).
This is the position vector of the object 1 with respect to the object 2.
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