An object slides on a level floor.It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2.What is the coefficient of kinetic friction between the object and the floor?

A) 0.24 B) 0.48 C) 0.12 D) It is impossible to determine without knowing the mass of the object. A) 0.24 B) 0.48 C) 0.12 D) It is impossible to determine without knowing the mass of the object.

Exam 6: Applications of Newtons Laws

A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal.It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block,as shown in the figure.The string pulls on the 15-kg block parallel to the surface of the ramp.Find the magnitude of the acceleration of the 19-kg block after the system is gently released?

(Multiple Choice)

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Question 21

A driver in a Car traveling at Slams on the brakes and skids to a stop.If the coefficient of friction between the tires and the level road is 0.80,how long will the skid marks be?

(Multiple Choice)

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Question 22

In the figure,what does the spring scale read? The pulleys are ideal and the strings and scale are also massless.

(Multiple Choice)

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Question 23

A 10-kg sign is held by two ropes as shown in the figure.What is the tension on rope A?

(Multiple Choice)

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Question 24

A 50.0-kg crate is being pulled along a horizontal smooth surface.The pulling force is 10.0 N and is directed 20.0° above the horizontal.What is the magnitude of the acceleration of the crate?

(Multiple Choice)

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Question 25

A horizontal 52-N force is needed to slide a Box across a flat surface at a constant velocity of 3.5 m/s.What is the coefficient of kinetic friction between the box and the floor?

(Multiple Choice)

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Question 26

A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal.What must be true about force of static friction f on the block?

(Multiple Choice)

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Question 27

An object moves with a constant speed of 30 m/s on a circular track of radius 150 m.What is the acceleration of the object?

(Multiple Choice)

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Question 28

Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord.The mass of P is greater than that of Q.A horizontal force Is applied to box Q as shown in the figure,accelerating the bodies to the right.The magnitude of the force exerted by the connecting cord on body P is

(Multiple Choice)

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Question 29

A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction.What is the tension in each cable?

(Multiple Choice)

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Question 30

A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation.What is the acceleration of that point due to the spin of the wheel?

(Multiple Choice)

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Question 31

An object slides on a level floor.It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s².What is the coefficient of kinetic friction between the object and the floor?

(Multiple Choice)

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Question 32

An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant)of 20.0 N/m.The ornament is then lowered very slowly until the spring stops stretching.How much does the spring stretch?

(Multiple Choice)

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Question 33

Two objects have masses m and 5m,respectively.They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance.Which one of the following statements about these objects is correct?

(Multiple Choice)

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Question 34

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice,causing the force of friction between the tires and the road to become zero.While the car is on the ice,it

(Multiple Choice)

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Question 35

A 1000-kg barge is being towed by means of two horizontal cables.One cable is pulling with a force of 80.0 N in a direction 30.0° west of north.In what direction should the second cable pull so that the barge will accelerate northward,if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge.

(Multiple Choice)

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Question 36

A very light ideal spring stretches by When it is used to hang a 135-N object.What is the weight of a piece of electronic equipment that would stretch the spring by If you hung the equipment using the spring?

(Multiple Choice)

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Question 37

The Moon is accelerated toward the earth,so it is gradually getting closer to the earth.

(True/False)

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Question 38

A push of magnitude P acts on a box of weight W as shown in the figure.The push is directed at an angle θ below the horizontal,and the box remains a rest.The box rests on a horizontal surface that has some friction with the box.The friction force on the box due to the floor is equal to

(Multiple Choice)

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Question 39

Two boxes are connected to each other by a string as shown in the figure.The 10-N box slides without friction on the horizontal table surface.The pulley is ideal and the string has negligible mass.What is true about the tension T in the string?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 104

Exam 6: Applications of Newtons Laws

A driver in a Car traveling at Slams on the brakes and skids to a stop.If the coefficient of friction between the tires and the level road is 0.80,how long will the skid marks be?

In the figure,what does the spring scale read? The pulleys are ideal and the strings and scale are also massless.

A 10-kg sign is held by two ropes as shown in the figure.What is the tension on rope A?

A 50.0-kg crate is being pulled along a horizontal smooth surface.The pulling force is 10.0 N and is directed 20.0° above the horizontal.What is the magnitude of the acceleration of the crate?

A horizontal 52-N force is needed to slide a Box across a flat surface at a constant velocity of 3.5 m/s.What is the coefficient of kinetic friction between the box and the floor?

A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal.What must be true about force of static friction f on the block?

An object moves with a constant speed of 30 m/s on a circular track of radius 150 m.What is the acceleration of the object?

A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction.What is the tension in each cable?

A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation.What is the acceleration of that point due to the spin of the wheel?

An object slides on a level floor.It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2.What is the coefficient of kinetic friction between the object and the floor?

An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant)of 20.0 N/m.The ornament is then lowered very slowly until the spring stops stretching.How much does the spring stretch?

Two objects have masses m and 5m,respectively.They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance.Which one of the following statements about these objects is correct?

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice,causing the force of friction between the tires and the road to become zero.While the car is on the ice,it

A very light ideal spring stretches by When it is used to hang a 135-N object.What is the weight of a piece of electronic equipment that would stretch the spring by If you hung the equipment using the spring?

The Moon is accelerated toward the earth,so it is gradually getting closer to the earth.

A push of magnitude P acts on a box of weight W as shown in the figure.The push is directed at an angle θ below the horizontal,and the box remains a rest.The box rests on a horizontal surface that has some friction with the box.The friction force on the box due to the floor is equal to

Two boxes are connected to each other by a string as shown in the figure.The 10-N box slides without friction on the horizontal table surface.The pulley is ideal and the string has negligible mass.What is true about the tension T in the string?

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An object slides on a level floor.It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s².What is the coefficient of kinetic friction between the object and the floor?