The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s2.The coefficient of kinetic friction between the puck and ice is:

A) 0.062 B) 0.25 C) 0.41 D) 0.62 E) 1.2 A) 0.062 B) 0.25 C) 0.41 D) 0.62 E) 1.2

A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m3).What would be its terminal speed in water (ρ = 1.0 x 103 kg/m3)?

A) 0.05 m/s B) 1.5 m/s C) 18 m/s D) 42 m/s E) 1200 m/s A) 0.05 m/s B) 1.5 m/s C) 18 m/s D) 42 m/s E) 1200 m/s

Exam 6: Force and Motion II

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A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are $\mu$ _s = 0.5 and $\mu$ _k = 0.4, the magnitude of the frictional force on the block is:

(Multiple Choice)

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Question 61

A 40-N crate rests on a rough horizontal floor.A 12-N horizontal force is then applied to it.If the coefficients of friction are $\mu$ _s = 0.5 and $\mu$ _k = 0.4, the magnitude of the frictional force on the crate is:

(Multiple Choice)

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Question 62

The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s².The coefficient of kinetic friction between the puck and ice is:

(Multiple Choice)

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Question 63

A horizontal shove of at least 200-N is required to start moving an 800-N crate initially at rest on a horizontal floor.The coefficient of static friction is:

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Question 64

A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?

(Multiple Choice)

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Question 65

A block is placed on a rough wooden plane.It is found that when the plane is tilted 30 $\degree$ to the horizontal, the block will slide down at constant speed.The coefficient of kinetic friction of the block with the plane is:

(Multiple Choice)

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Question 66

Why do raindrops fall with constant speed during the later stages of their descent?

(Multiple Choice)

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Question 67

One end of a 1.0-m long string is fixed; the other end is attached to a 2.0-kg stone.The stone swings in a vertical circle, passing the bottom point at 4.0 m/s.The tension force of the string at this point is about:

(Multiple Choice)

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Question 68

In uniform circular motion,

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Question 69

A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m³).What would be its terminal speed in water (ρ = 1.0 x 10³ kg/m³)?

(Multiple Choice)

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Question 70

A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force as shown.The magnitude of frictional force is:

(Multiple Choice)

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Question 71

An automobile moves on a level horizontal road in a circle of radius 30 m.The coefficient of friction between tires and road is 0.50.The maximum speed with which this car can round this curve is:

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Question 72

A crate rests on a horizontal surface and a woman pulls on it with a 10-N force.No matter what the orientation of the force, the crate does not move.Rank the situations shown below according to the magnitude of the frictional force of the surface on the crate, least to greatest.

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Question 73

A giant wheel, 40 m in diameter, is fitted with a cage and platform on which a man can stand.The wheel rotates at such a speed that when the cage is at X (as shown)the force exerted by the man on the platform is equal to his weight.The speed of the man is:

(Multiple Choice)

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Question 74

Showing 61 - 74 of 74

Exam 6: Force and Motion II

A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are μ\muμ s = 0.5 and μ\muμ k = 0.4, the magnitude of the frictional force on the block is:

A 40-N crate rests on a rough horizontal floor.A 12-N horizontal force is then applied to it.If the coefficients of friction are μ\muμ s = 0.5 and μ\muμ k = 0.4, the magnitude of the frictional force on the crate is:

The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s2.The coefficient of kinetic friction between the puck and ice is:

A horizontal shove of at least 200-N is required to start moving an 800-N crate initially at rest on a horizontal floor.The coefficient of static friction is:

A block is placed on a rough wooden plane.It is found that when the plane is tilted 30 °\degree° to the horizontal, the block will slide down at constant speed.The coefficient of kinetic friction of the block with the plane is:

Why do raindrops fall with constant speed during the later stages of their descent?

One end of a 1.0-m long string is fixed; the other end is attached to a 2.0-kg stone.The stone swings in a vertical circle, passing the bottom point at 4.0 m/s.The tension force of the string at this point is about:

In uniform circular motion,

A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m3).What would be its terminal speed in water (ρ = 1.0 x 103 kg/m3)?

A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force as shown.The magnitude of frictional force is:

An automobile moves on a level horizontal road in a circle of radius 30 m.The coefficient of friction between tires and road is 0.50.The maximum speed with which this car can round this curve is:

A crate rests on a horizontal surface and a woman pulls on it with a 10-N force.No matter what the orientation of the force, the crate does not move.Rank the situations shown below according to the magnitude of the frictional force of the surface on the crate, least to greatest.

A giant wheel, 40 m in diameter, is fitted with a cage and platform on which a man can stand.The wheel rotates at such a speed that when the cage is at X (as shown)the force exerted by the man on the platform is equal to his weight.The speed of the man is:

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A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are $\mu$ _s = 0.5 and $\mu$ _k = 0.4, the magnitude of the frictional force on the block is:

A 40-N crate rests on a rough horizontal floor.A 12-N horizontal force is then applied to it.If the coefficients of friction are $\mu$ _s = 0.5 and $\mu$ _k = 0.4, the magnitude of the frictional force on the crate is:

The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s².The coefficient of kinetic friction between the puck and ice is:

A block is placed on a rough wooden plane.It is found that when the plane is tilted 30 $\degree$ to the horizontal, the block will slide down at constant speed.The coefficient of kinetic friction of the block with the plane is:

A baseball has a terminal speed of 42 m/s in air (ρ = 1.2 kg/m³).What would be its terminal speed in water (ρ = 1.0 x 10³ kg/m³)?