A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block.

A) 4.2 N B) 3.0 N C) 3.4 N D) 3.8 N E) 2.3 N A) 4.2 N B) 3.0 N C) 3.4 N D) 3.8 N E) 2.3 N

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0. The total time of travel is 2t. The total distance the body travels in that time is

A) . B) . C) . D) . E) . A) . B) . C) . D) . E) .

Exam 5: The Laws of Motion

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Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration of the first person to the acceleration of the second person. Which statement is correct?

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Question 81

The horizontal surface on which the objects slide is frictionless. If M = 1.0 kg and the magnitude of the force of the small block on the large block is 5.2 N, determine F.

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Question 82

If α = 40° and the tension in string 2 is 30 N, determine M.

(Multiple Choice)

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Question 83

A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s² down the incline. Determine the magnitude of the force of friction acting on the block.

(Multiple Choice)

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Question 84

The surface of the inclined plane shown is frictionless. If F = 30 N, what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?

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Question 85

Which type of force would be the equal and opposite force to a gravitational force?

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Question 86

A constant force F is applied to a body of mass m that initially is headed east at velocity v₀ until its velocity becomes −v₀. The total time of travel is 2t. The total distance the body travels in that time is

(Multiple Choice)

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Question 87

The vector sum of three co-planar forces

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Question 88

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s². What is the mass of the body?

(Multiple Choice)

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Question 89

Given the equation , which answer or answers provide(s) the best description of a possible physical situation?

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Question 90

A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15. What is the magnitude of the block's acceleration?

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Question 91

When the vector sum of three co-planar forces, , and , is parallel to , we can conclude that and

(Multiple Choice)

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Question 92

When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction

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Question 93

A 5.0-kg mass is suspended by a string from the ceiling of an elevator that is moving upward with a speed which is decreasing at a constant rate of 2.0 m/s in each second. What is the tension in the string supporting the mass?

(Multiple Choice)

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Question 94

A high-diver of mass 70.0 kg jumps off a board 10.0 m above the water. If, two seconds after entering the water, his downward motion is stopped, what average upward force did the water exert on him?

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Question 95

The horizontal surface on which the block slides is frictionless. If F = 20 N and M = 5.0 kg, what is the magnitude of the resulting acceleration of the block?

(Multiple Choice)

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Question 96

If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1?

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Question 97

A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is

(Multiple Choice)

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Question 98

The apparent weight of a fish in an elevator is greatest when the elevator

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Question 99

Two bodies, A and B, collide as shown in Figures I and II below. Which statement is true?

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Question 100

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Exam 5: The Laws of Motion

Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration of the first person to the acceleration of the second person. Which statement is correct?

The horizontal surface on which the objects slide is frictionless. If M = 1.0 kg and the magnitude of the force of the small block on the large block is 5.2 N, determine F.

If α = 40° and the tension in string 2 is 30 N, determine M.

A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block.

The surface of the inclined plane shown is frictionless. If F = 30 N, what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?

Which type of force would be the equal and opposite force to a gravitational force?

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0. The total time of travel is 2t. The total distance the body travels in that time is

The vector sum of three co-planar forces

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?

Given the equation , which answer or answers provide(s) the best description of a possible physical situation?

A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15. What is the magnitude of the block's acceleration?

When the vector sum of three co-planar forces, , and , is parallel to , we can conclude that and

When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction

A 5.0-kg mass is suspended by a string from the ceiling of an elevator that is moving upward with a speed which is decreasing at a constant rate of 2.0 m/s in each second. What is the tension in the string supporting the mass?

A high-diver of mass 70.0 kg jumps off a board 10.0 m above the water. If, two seconds after entering the water, his downward motion is stopped, what average upward force did the water exert on him?

The horizontal surface on which the block slides is frictionless. If F = 20 N and M = 5.0 kg, what is the magnitude of the resulting acceleration of the block?

If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1?

A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is

The apparent weight of a fish in an elevator is greatest when the elevator

Two bodies, A and B, collide as shown in Figures I and II below. Which statement is true?

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A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s² down the incline. Determine the magnitude of the force of friction acting on the block.

A constant force F is applied to a body of mass m that initially is headed east at velocity v₀ until its velocity becomes −v₀. The total time of travel is 2t. The total distance the body travels in that time is

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s². What is the mass of the body?