a diver jumps off a diving platform. which of the following does not explain why the diver accelerates as they fall? i. the momentum of the earth/diver system is conserved ii. there is a downwards gravitational force on the diver

We can see the moons should be ranked in the following order from oldest to youngest:

A moon is a natural satellite that orbits a planet. Moons are typically much smaller than their parent planets and are held in orbit by the planet's gravity. They come in a variety of sizes and shapes, and can be composed of a wide range of materials, such as rock, ice, or a mixture of both.

Moons play an important role in our solar system. They help stabilize the orbits of planets, contribute to tidal forces, and may even play a role in the formation and evolution of planets themselves.

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The orbital speed of the second satellite is 6.55 × 10³ m/s.

The formula used to find the orbital speed of a satellite is given as v=√(GM/r).

Therefore, the value of the first satellite's speed is given as v₁=1.89×104 m/s, and the radius is r₁=2.76×106 m. Using the above formula, the mass of the planet is given as:

M= v²r/G= (1.89×104 m/s)² (2.76×106 m)/(6.6743 × 10⁻¹¹ Nm²/kg²) = 5.31 × 10²⁴ kg.

Now, the orbital speed of the second satellite, given as v₂, is equal to:

v₂ = √(GM/r₂); where G = gravitational constant = 6.6743 × 10⁻¹¹ Nm²/kg²;

M = mass of the planet = 5.31 × 10²⁴ kg;

r₂ = radius of orbit of the second satellite = 6.98 × 10⁶ m.

Substituting the values given above, we get:

v₂ = √(GM/r₂)= √[(6.6743 × 10⁻¹¹ Nm²/kg²) × (5.31 × 10²⁴ kg) / (6.98 × 10⁶ m)] = 6.55 × 10³ m/s

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The following formula can be used to determine the work involved in moving a charge via an electric potential difference:

W = qΔV

where W stands for work completed, q for charge transported, and V for potential difference.

Inputting the values provided yields:

W = (3.0 C) x (1.5 V) = 4.5 J

As a result, 3.0 C moving across a 1.5 V electric potential differential requires 4.5 J of labour.

Response: D) 4.5 J

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Answer:

C

Explanation:

 Ever heard of a 'spin' class at your local gym?  ===> spinning on a stationary bike with others doing the same

Answer: D

Explanation:

A car of mass 772 kg is traveling at 21.4 m/s when the driver applies the brakes, which lock the wheels. The car skids for 4.87 s in the positive x-direction before coming to rest.

The required calculations can be performed using the following equations:

1. F = ma2. v = u + at3. s = ut + (1/2) at^2

Here, u = 21.4 m/s (initial velocity)

a = (-μg) = (-0.5 x 9.8) = -4.9 m/s^2 (deceleration due to the lock)

μ = 0.5 (frictional coefficient between road and tires)

g = 9.8 m/s^2 (acceleration due to gravity)

The normal force is given as:

N = mgN = 772 x 9.8N = 7580.6 N

Now, the force due to friction can be calculated:

F = μN = 0.5 x 7580.6F = 3790.3 N

Therefore, acceleration can be calculated as follows:

F = ma=> a = F/m=> a = 3790.3/772a = 4.91 m/s^2

Now, the final velocity can be calculated as:

v = u + at=> v = 21.4 + (-4.91 x 4.87)v = -0.384 m/s

A negative sign indicates that the car is moving in the negative x-direction.

In order to calculate the distance traveled, we will use the formula:s = ut + (1/2) at^2=> s = 21.4 x 4.87 + (1/2) x (-4.91) x (4.87)^2s = 52.79 mT

herefore, the car skids for 52.79 m in the negative x-direction before coming to rest.

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When one stationary object is replaced by another stationary object, the change between the two objects maybe perceived as the movement of a single object. This creates an optical illusion.

An optical illusion is defined as a visual phenomenon in which the information gathered by the eye is processed in a way that results in a false perception of reality or the visual impression of seeing something that is not present or incorrectly perceiving it. It is a misinterpretation of a visual stimulus caused by the brain's ability to misjudge sensory information.

It can happen when visual information is processed in the brain, and it can create an impression of movement that isn't there. This phenomenon occurs when an object is moving or when the eyes are moving around, but it can also happen when the object being looked at is stationary.

When one stationary object is replaced by another stationary object, the change between the two objects maybe perceived as the movement of a single object. This creates an optical illusion because the visual system is misled into thinking that the object is moving.

The brain continues to process visual information even when the object is stationary, creating the impression that the object is moving. This is why an optical illusion can be used to make a stationary object appear to move or to make a moving object appear to be stationary.

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The inventor of the photographic process in which a photograph produced without a negative by exposing objects to light on light-sensitive paper is named William Henry Fox Talbot.

Photography is the art, process, and practice of creating photographs, which are images recorded by light or other electromagnetic radiation, either electronically or chemically, onto an image sensor or other light-sensitive material.

Photography has made its way from the ancient Chinese invention of the camera obscura in the fifth century BCE to the worldwide photographic society of the present. The first photographic image was taken by French inventor Joseph Nicéphore Niépce in 1826, but the earliest surviving photograph was taken by French photographer Louis Daguerre in 1837.

William Henry Fox Talbot, an English scientist, produced the first photographic negative, which enabled him to make multiple prints, in 1835. Fox Talbot also developed the calotype method, which replaced the daguerreotype and allowed for images to be developed on paper that was first coated with silver iodide and then developed in gallic acid.

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The nephron loop is where the countercurrent mechanism predominantly operates. The Henle loop is the name of the nephron component.

Reabsorbing water and sodium chloride from the filtrate is its principal purpose. By creating urine that is extremely concentrated, this helps the body preserve water. Kidney cross slice showing the nephron (kidney tubule) in detail and its associated blood supply.

Renal tubular fluid is defined as fluid present within the lumen of a nephron loop. Glomerular filtrate is the term used to describe the fluid found inside Bowman's capsule. Urine would be regarded as the fluid contained in the collecting duct.

The fact that loop diuretics work on the Loop of Henle gives them their name. They function by blocking NKCC2 transporters in the thick ascending limb, preventing the reabsorption of sodium, potassium, and chloride.

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In this experiment, the factor is the ambient color schemes. In other words, the independent variable is the ambient color schemes.

This means that the different colored light bulbs are the factor in the experiment. Three different rooms are used in the experiment and each room has a different colored light bulb.

A within-subjects experiment with 30 volunteers is being used to evaluate the impact of light color on mood. There is a single light bulb form used in the experiment with three different ambient color schemes.

Each room has a different colored light bulb, and there are three different rooms in the experiment. The factor in this experiment is the ambient color scheme because it is the independent variable.

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The average density of the neutron star that has a mass of about 1.5Msun and a radius of 10 kilometers rounded off to two significant figures is 5.9 × 10¹⁴ kg/cm³

The average density of a neutron star can be calculated using the following formula;`d = (3M)/(4πr³)`where `d` is the average density of the neutron star, `M` is the mass of the neutron star, and `r` is the radius of the neutron star.Using the given values in the formula, we get;`d = (3 × 1.5 × 1.989 × 10³⁰)/(4π × (10 × 10³)³)` = 5.9 × 10¹⁷ kg/m³To convert kg/m³ to kg/cm³, we can use the following conversion factor;1 m³ = 10⁶ cm³Therefore,1 kg/m³ = 10⁻³ kg/cm³So, the average density of the neutron star in kg/cm³ is;`d = (5.9 × 10¹⁷) × (10⁻³)` = 5.9 × 10¹⁴ kg/cm³Therefore, the average density of the neutron star is 5.9 × 10¹⁴ kg/cm³ (rounded to two significant figures).Answer: 5.9 × 10¹⁴ kg/cm³.

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If I move 3 m east and 4 m north, then my displacement would be 5m.

In geometry and mechanics, displacement is defined as a vector whose length is the shortest distance from initial to the final position of a point P undergoing the motion.

If an object moves relative to the reference frame—for example, if professor moves to the right relative to whiteboard or passenger moves toward the rear of airplane—then object's position changes. And this change in position is known as displacement.

Given AB= 3m east and BC= 4m north

AC= √ 3² + 4²= 25

So, AC, displacement = 5m

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A forward biased has been applied to a P-N junction if the cathode is positive with respect to the anode.

A P-N junction is a type of semiconductor junction formed by joining together two types of semiconductors - P-type and N-type. P-type semiconductors have an excess of positively charged holes, while N-type semiconductors have an excess of negatively charged electrons.

When these two types of semiconductors are brought into contact, the electrons from the N-type material flow into the P-type material, filling some of the holes and creating a region with a net negative charge (the N-side), while the P-type material loses some of its holes and creates a region with a net positive charge (the P-side). This creates a potential difference between the P and N regions, which can be used to generate a current. P-N junctions are essential components in electronic devices such as diodes, transistors, and solar cells.

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When the electron density is unevenly distributed around atoms in a covalent bond, it is considered to be polar.

Polar covalent bonds are a type of chemical bond formed between atoms that share electrons unequally. In a covalent bond, two atoms share electrons in order to achieve a stable electron configuration.

Polar covalent bonds occur when the electronegativity difference between the two atoms in the bond is significant enough to cause the electrons to be shared unequally. The atom with the higher electronegativity attracts the shared electrons closer to itself, resulting in a partial negative charge, while the other atom has a partial positive charge. This unequal distribution of charges in the bond creates a dipole moment, giving rise to a polar bond.

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The Chevy will travel a distance f about 600m before catching up with the ford in the same direction of the motion.

The ford if travelling at 15m/s and it is 200 m ahead of the Chevy that is travelling in the same direction with a speed of 20m/s.

Now, we can use velocity = distance/time here,

Time of ford will be equal to the time of Chevy,

Time of ford = Distance/velocity of ford

Time of ford = S/15

Now, for the Chevy, the distance will be 200 more and the time will be same, so we will write,

Time of Chevy = (S+200)/20

(S+200)/20 = S/15

15S + 3000 = 20S

5S = -2000

S = -400m

Negative sign is showing the direction of the motion only, so we can ignore that.

So, the Chevy will travel 600 m before catching up with the ford.

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An arrow shot from a bow gets its kinetic energy from the potential energy stored in the bowstring and limbs. When the bowstring is pulled back, it stores energy in the limbs as elastic potential energy.

What is kinetic energy?

Kinetic energy is defined as the energy an object has due to its motion. When an arrow is shot from a bow, it is set in motion and therefore has kinetic energy. The kinetic energy of the arrow depends on its mass and speed. The heavier the arrow, the more kinetic energy it has, and the faster the arrow, the more kinetic energy it has.

The energy stored in the bow is transferred to the arrow when the string is released and the limbs snap back to their original position. This causes the arrow to be propelled forward with a significant amount of kinetic energy.

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The period of a satellite, the time it takes for a complete revolution, depends on the satellite's radial distance. Hence, the correct option is a.

A satellite is an object in space that revolves around a planet, a moon, or even another satellite. Satellites, particularly those in the field of technology, enable the gathering of information and communication of information between two locations on Earth. Satellites can also be used for weather forecasting and military surveillance.

A revolution is one complete orbit around a central body for a satellite. The amount of time it takes for a satellite to complete one revolution is known as the satellite's period. As a result, it is clear that the period of a satellite depends on its radial distance. The closer a satellite is to the planet, the shorter its period would be, while the farther away it is, the longer its period would be.

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Answer: The model star/planet would have to be 1,000 km away from the next closest star.

Explanation:
We need to find out the distance required for the distances in the system to be in scale.

Let's use the proportion to solve the problem:

1 m/4 × 10⁷ km = x/4 × 10¹³ km

Where x is the distance required for the distances in the system to be in scale.

Cross-multiply: 4 × 10¹³ km × 1 m = 4 × 10⁷ km × x

Simplify: 4 × 10¹³ m = 4 × 10⁷ x

Divide both sides by 4 × 10⁷ :1 × 10⁶ = x

Therefore, the distance required for the distances in the system to be in scale is 1 × 10⁶ m or 1,000 km.

So the model star/planet would have to be 1,000 km away from the next closest star.

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The rate of acceleration of the body is 0.831 ft/sec² upward.

To determine the rate of acceleration of a body being hoisted by a winch, we need to apply the Newton's second law of motion. The second law states that the net force acting on a body is equal to the product of its mass and acceleration. Mathematically,

F = ma

Where

Given that a 91.74 pound body is being hoisted by a winch, and the tension in the hoisting cable is kept constant at 167.97 pounds. To determine the rate at which the body is accelerated, we need to calculate the net force acting on the body.

Net force = Tension in the hoisting cable - Weight of the body= 167.97 - 91.74= 76.23 pounds.

Now we can substitute the net force into the formula F = ma as follows:

76.23 = ma

Rearranging the formula, we get;

a = 76.23/m

where m is the mass of the body expressed in pounds. Therefore, the rate of acceleration of the body is given by;

a = 76.23/91.74 = 0.831 ft/sec² upward.

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The resultant speed of the ball just before it strikes the ground can be calculated by using the equation of motion. The equation of motion for an object in free fall is: s = u + at

Where:

In this case, the initial velocity (u) is 0 (since it is thrown horizontally). The acceleration (a) is 9.81 m/s2, and the distance travelled (s) is 195 m (the distance from the top of the building to the point of impact).

Plugging the values into the equation: 195 = 0 + 9.81t. Solving for t, we get t = 19.84 s.

The resultant speed (v) can be calculated by using the equation v = u + at. Since u is 0, the equation simplifies to v = 9.81t. Plugging in the value of t that we found earlier, we get v = 195.87 m/s, which is the resultant speed of the ball just before it strikes the ground.

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The electrostatic force between 1nc and 1nc charges at a distance of 1 m from each other is 9.0 × 10^-9 N. The direction of the force is given by Coulomb's law and is along the line joining the two charges. It is either repulsive or attractive based on the type of the charges.

What is Coulomb's law? Coulomb's law is an equation used to calculate the electrostatic force between two charged particles. According to this law, the force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them. The equation for Coulomb's law is given by:

F = k * (q1 * q2) / r^2

Where F is the electrostatic force,k is Coulomb's constant,q1 and q2 are the charges of the particles, and r is the distance between the particles.

Given,

Charge of particle 1, q1 = 1 nc

Charge of particle 2, q2 = 1

distance between particles, r = 1

coulomb's constant, k = 9 × 10^9 N m^2/C^2

Now, we can use Coulomb's law to calculate the electrostatic force between the two charges. Substituting the given values in the equation:

F = k * (q1 * q2) / r^2= 9 × 10^9 N m^2/C^2 * (1 × 10^-9 C) * (1 × 10^-9 C) / (1 m)^2= 9.0 × 10^-9 N

Thus, the electrostatic force between 1nc and 1nc charges at a distance of 1 m from each other is 9.0 × 10^-9 N. The direction of the force is given by Coulomb's law and is along the line joining the two charges. It is either repulsive or attractive based on the type of the charges.

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Here are some ideas for setting up the barber's salon based on the size of the space and the products available: The wooden chair should be positioned in the middle of the space, facing a wall.

The barber's workspace will be this. The room's other three walls should be covered with the three enormous mirrors. This will give the impression that there is more space present and enlarge the room. The mirrors should be angled to reflect both the client in the chair and the barber's work area. Over the chair, suspend the lightbulb from the ceiling. The barber salon will be able to operate in enough lighting thanks to this.The wooden chair should be positioned in the middle of the space,  The barber can set up a white sheet or a reflecting surface to improve illumination even further.

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The current through the lightbulb when a lightbulb is in series with a 2.0 ohm resistor is I = 1.78 A, 2.96 A.

The current through the lightbulb when a lightbulb is in series with a 2.0 ohm resistor is given by the Ohm's Law. Ohm's law states that current through a conductor between two points is directly proportional to the voltage across the two points. In other words, V = IR. Where V is the voltage, I is the current and R is the resistance. When the circuit is connected to a battery, the lightbulb dissipates 10W. Power can also be expressed as P = IV, where P is the power, I is the current and V is the voltage. We have V = IR and P = IV.

We can substitute V in terms of I from the first equation to the second equation.P = I²R=> I² = P/R=> I = √(P/R) = √(10W/2Ω) = 2.24 A. There are two possible answers. When we apply Ohm's Law to the circuit, I = V/R Where R = 2.0 Ω and V is the voltage across the resistor.I = V/2 = (10/2)^(1/2) A = 1.78 A.The other possible answer is the current through the light bulb.I = (10/2.0 + 2.0) A = 2.96 A. Therefore, the current through the lightbulb when a lightbulb is in series with a 2.0 ohm resistor is I = 1.78 A, 2.96 A.

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The forces acting on the turtle and the cat when they are on the ground and not moving are balanced. Therefore, option 1 is the correct answer.

When the forces are balanced, the object is at rest or it will move at a constant speed in a straight line. In this case, both the turtle and the cat are on the ground and not moving. Therefore, the forces acting on both of them are balanced.

Unbalanced forces cause the object to accelerate or change direction. The magnitude and direction of the forces are not equal in unbalanced forces. Therefore, options 2, 3, and 4 are incorrect answers.

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The speed of water at the point with a radius of 0.150 m is 16.97 m/s while the radius of the pipe at the point where the water speed is 2.90 m/s is 0.0682 m.

a) To find the speed of the water at a point of a circular pipe where the radius is 0.150 m if the water is flowing into this pipe at a steady rate of 1.20 m³/s, we'll use the equation;

Q = A₁V₁ = A₂V₂ Where Q = Flow rate (m³/s)A₁ = Cross-sectional area at one point (m²)V₁ = Velocity of water at one point (m/s)A₂ = Cross-sectional area at a second point (m²)V₂ = Velocity of water at the second point (m/s)At one point in the pipe, the radius is 0.150 m.Therefore, the cross-sectional area, A₁ is given by:

A₁ = πr₁² = π (0.150 m)² = 0.0707 m²Given that the water is flowing into the pipe at a steady rate of 1.20 m³/s, we can write;Q = A₁V₁1.20 m³/s = 0.0707 m² V₁V₁ = 1.20/0.0707V₁ = 16.97 m/s.Therefore, the speed of water at the point with a radius of 0.150 m is 16.97 m/s.

b) To find the radius of the pipe at a point where the water speed is 2.90 m/s, we'll use the same equation as in part (a);Q = A₁V₁ = A₂V₂At a second point in the pipe, the water speed is 2.90 m/s.Given that the water completely fills the pipe, we know that the volume flow rate, Q will remain constant at 1.20 m³/s.So, we have:

Q = A₁V₁ = A₂V₂We know that A₁ = πr₁²So, Q = πr₁²V₁Also, we know that A₂ = πr₂²So, Q = πr₂²V₂Since the volume flow rate is constant, we can equate both equations,πr₁²V₁ = πr₂²V₂Dividing both sides of the equation by π, we have;r₁²V₁ = r₂²V₂But we are interested in finding the radius of the pipe at the second point, r₂.So, we can express r₁ in terms of r₂ using the relationship between the cross-sectional areas;

A₁ = A₂r₁² = (A₂/A₁)²r₂²r₁ = r₂ (A₂/A₁)^(1/2).We know that A₁ = πr₁²We can find A₂ using the fact that the water completely fills the pipe;

A₁V₁ = A₂V₂πr₁²V₁ = A₂V₂π(0.150 m)²(16.97 m/s) = A₂(2.90 m/s)A₂ = π(0.150 m)²(16.97 m/s)/(2.90 m/s)A₂ = 0.0707 m²

So,r₂ = r₁(A₂/A₁)^(1/2)r₂ = 0.150 m × (0.0707 m²/π)/(0.0150 m²)^(1/2)r₂ = 0.0682 m. Therefore, the radius of the pipe at the point where the water speed is 2.90 m/s is 0.0682 m.

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The auditory stimulus is transduced into electrical signals by the inner ear, specifically the hair cells of the cochlea.

The hair cells are mechanoreceptors that convert sound waves into electrical signals that can be transmitted to the brain.The auditory stimulus is any sound that is heard by the ear. Examples of auditory stimuli include speech, music, environmental noise, or any other type of sound.

Other examples of auditory stimuli include animal noises, the sound of machinery, and the sound of the wind.

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The angular frequency of circular motion is given by the expression:

ω = [tex]\sqrt{qB/m}[/tex]

If the resulting trajectory of the charged particle is a circle, the angular frequency (ω) of the circular motion can be expressed in terms of g, m, and Bo as follows:

ω = [tex]\sqrt{qB/m}[/tex]

where q is the charge of the particle, B is the magnetic field strength, and m is the mass of the particle.

This formula is known as the cyclotron frequency equation.

The circular motion occurs because the magnetic force (F = qvB) on the charged particle is perpendicular to its velocity (v) and results in a centripetal force that keeps the particle in a circular path with a constant speed.

The angular frequency (ω) represents the rate at which the particle completes a full revolution (2π radians) around the center of the circular path per unit of time.

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Answer:

1. Net force: 60N (⭐️)

Direction: West

2. Net force: 60N

Direction: East

3. Net force: 18N (⭐️)

Direction: East

4. Net force: 20N

Direction: No movement

5. Net force: 20N

Direction: No movement

Explanation:

Hope you understand :)

The change in momentum of a dynamic cart acted upon by the force of a spring is related to the impulse.Impulse is equal to the change in momentum of an object. The force that acts on an object over a given time period determines the impulse. It is the product of force and time.

Impulse, in fact, is also equal to the total momentum of the object before the force is applied. Impulse is a vector quantity with the same direction as the force, as well as the momentum.

The impulse delivered to the cart by the spring will be equal and opposite to the impulse exerted by the cart on the spring, according to Newton's third law of motion.

As a result, the change in momentum of the dynamic cart due to the force of a spring is related to the impulse.

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Option (B) longer time to stop, is the correct answer.The reason for wine glasses not breaking when they fall on a carpeted floor, compared to falling on a wooden floor, is due to the longer time to stop.

Impulse is a measure of the change in momentum that an object experiences when subjected to an impact force. The impulse in stopping is not the reason wine glasses may not break when they fall to a carpeted floor.Wine glasses are fragile, and when they hit a hard surface, they are likely to break. Wine glasses may not break when they fall on a carpeted floor because the carpet is soft and has a low elastic modulus.

The carpet is capable of absorbing some of the impact's energy, reducing the amount of energy that the wine glass receives. Because the carpet has a low elastic modulus, it takes longer for the wine glass to come to a stop, reducing the force that the glass experiences when it hits the ground. When a wine glass falls on a hard surface such as a wooden floor, the glass comes to a stop more quickly, meaning that the stopping time is less, and the force of impact is higher, making it more likely to break.

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A student must analyze data collected from an experiment in which a block of mass 2M traveling with a speed vo collides with a block of mass M that is initially at rest. After the collision, the two blocks stick together. Thus, the correct options are A and B.

The initial momentum of the system = the momentum of block 1 = (2M)vo. The final momentum of the system = the momentum of the combined blocks = (2M + M)uf = 3Muf. Therefore, the correct applications of the equation for the conservation of momentum that represent the initial and final momentum of the system for a completely inelastic collision between the blocks are:

2Mo = 3Muf, because the blocks stick together after the collision. 3Mvo = 3MUf, because the blocks stick together after the collision.

Therefore, the correct options are A and B.

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