On its own,a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

A) 2.5 m/s2 B) 2.0 m/s2 C) 1.5 m/s2 D) 1.0 m/s2 A) 2.5 m/s2 B) 2.0 m/s2 C) 1.5 m/s2 D) 1.0 m/s2

Exam 8: Force | Examlex

A 20.0-N box rests on a 50.0-N box on a perfectly smooth horizontal floor.When a horizontal 15.0-N pull to the right is exerted on the lower box (see figure),both boxes move together.Find the magnitude and direction of the net external force on the upper box.

(Short Answer)

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Question 41

The figure shows a graph of the acceleration of an object as a function of the net force acting on it. The mass of this object,in grams,is closest to

(Multiple Choice)

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Question 42

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N.From this information,the student knows that the elevator must be moving

(Multiple Choice)

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Question 43

An 1100-kg car traveling at 27.0 m/s starts to slow down and comes to a complete stop in 578 m.What is the magnitude of the average braking force acting on the car?

(Multiple Choice)

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Question 44

A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. Which of the following forces is the other force if the acceleration of the object is 1.0 m/s² toward the east?

(Multiple Choice)

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Question 45

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point down the ramp.

(True/False)

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Question 46

A stalled car is being pushed up a hill at constant velocity by three people.The net force on the car is

(Multiple Choice)

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Question 47

A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure.The 6.00-kg block is being pushed by a horizontal 20.0-N force as shown. What is the magnitude of the force that the 6.00-kg block exerts on the 4.00-kg block?

(Multiple Choice)

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Question 48

A time-varying horizontal force F(t)= At⁴ + Bt² acts for 0.500 s on a 12.25-kg object,starting at time t = 1.00 s.In the SI system,A has the numerical value 4.50 and B has the numerical value 8.75. (a)What are the SI units of A and B? (b)What impulse does this force impart to the object?

(Short Answer)

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Question 49

A car is being towed at constant velocity on a horizontal road using a horizontal chain.The tension in the chain must be equal to the weight of the car in order to maintain constant velocity.

(True/False)

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Question 50

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure).Which one of the following relationships between T and P must be true?

(Multiple Choice)

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Question 51

On its own,a certain tow-truck has a maximum acceleration of 3.0 m/s². What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

(Multiple Choice)

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Question 52

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it.What is the acceleration at points A and B?

(Short Answer)

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Question 53

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands.The mass of object 2 is 36 kg.What are the masses of objects 1 and 3?

(Multiple Choice)

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Question 54

The figure shows two 1.0 kg-blocks connected by a rope.A second rope hangs beneath the lower block.Both ropes have a mass of 250 g.The entire assembly is accelerated upward at 2.3 m/s² by force .What is the tension at the top end of rope 1?

(Multiple Choice)

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Question 55

Two objects are connected by a very light flexible string as shown in the figure,where M = 0.60 kg and m = 0.40 kg. You can ignore friction and the mass of the pulley. (a) Draw free-body diagrams for each object. (b) Calculate the magnitude of the acceleration of each object. (c) Calculate the tension in the string.

(Essay)

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Question 56

During a collision with a wall,the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from the wall. If the time the ball was in contact with the wall was 60.0 ms,what was the magnitude of the average force applied to the ball?

(Multiple Choice)

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Question 57

A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3.0 m/s². (a) Determine the mass of the block. (b) Calculate the distance the block will travel if the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.

(Short Answer)

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Question 58

A fish weighing 16 N is weighed using two spring scales,each of negligible weight,as shown in the figure.What will be the readings of the scales?

(Multiple Choice)

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Question 59

Which one of the following free-body diagrams best represents the free-body diagram,with correct relative force magnitudes,of a person in an elevator that is traveling upward with an unchanging velocity? _f is the force of the floor on the person and _g is the force of gravity on the person.

(Multiple Choice)

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Question 60

Showing 41 - 60 of 76

Exam 8: Force

A 20.0-N box rests on a 50.0-N box on a perfectly smooth horizontal floor.When a horizontal 15.0-N pull to the right is exerted on the lower box (see figure),both boxes move together.Find the magnitude and direction of the net external force on the upper box.

The figure shows a graph of the acceleration of an object as a function of the net force acting on it. The mass of this object,in grams,is closest to

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N.From this information,the student knows that the elevator must be moving

An 1100-kg car traveling at 27.0 m/s starts to slow down and comes to a complete stop in 578 m.What is the magnitude of the average braking force acting on the car?

A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. Which of the following forces is the other force if the acceleration of the object is 1.0 m/s2 toward the east?

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point down the ramp.

A stalled car is being pushed up a hill at constant velocity by three people.The net force on the car is

A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure.The 6.00-kg block is being pushed by a horizontal 20.0-N force as shown. What is the magnitude of the force that the 6.00-kg block exerts on the 4.00-kg block?

A time-varying horizontal force F(t)= At4 + Bt2 acts for 0.500 s on a 12.25-kg object,starting at time t = 1.00 s.In the SI system,A has the numerical value 4.50 and B has the numerical value 8.75. (a)What are the SI units of A and B? (b)What impulse does this force impart to the object?

A car is being towed at constant velocity on a horizontal road using a horizontal chain.The tension in the chain must be equal to the weight of the car in order to maintain constant velocity.

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure).Which one of the following relationships between T and P must be true?

On its own,a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it.What is the acceleration at points A and B?

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands.The mass of object 2 is 36 kg.What are the masses of objects 1 and 3?

The figure shows two 1.0 kg-blocks connected by a rope.A second rope hangs beneath the lower block.Both ropes have a mass of 250 g.The entire assembly is accelerated upward at 2.3 m/s2 by force .What is the tension at the top end of rope 1?

During a collision with a wall,the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from the wall. If the time the ball was in contact with the wall was 60.0 ms,what was the magnitude of the average force applied to the ball?

A fish weighing 16 N is weighed using two spring scales,each of negligible weight,as shown in the figure.What will be the readings of the scales?

Which one of the following free-body diagrams best represents the free-body diagram,with correct relative force magnitudes,of a person in an elevator that is traveling upward with an unchanging velocity? f is the force of the floor on the person and g is the force of gravity on the person.

Foundations

A: Foundations

Motion in One Dimension

Acceleration

Momentum

Energy

Principle of Relativity

Interactions

Work

Motion in a Plane

Motion in a Circle

Torque

Gravity

Special Relativity

Periodic Motion

Waves in One Dimension

Waves in Two and Three Dimensions

Fluids

Entropy

Energy Transferred Thermally

Degradation of Energy

Electric Interactions

The Electric Field

Gausss Law

Work and Energy in Electrostatics

Charge Separation and Storage

Magnetic Interactions

Magnetic Fields of Charged Particles in Motion

Changing Magnetic Fields

Changing Electric Fields

Electric Circuits

Electronics

Ray Optics

Wave and Particle Optics

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A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. Which of the following forces is the other force if the acceleration of the object is 1.0 m/s² toward the east?

A time-varying horizontal force F(t)= At⁴ + Bt² acts for 0.500 s on a 12.25-kg object,starting at time t = 1.00 s.In the SI system,A has the numerical value 4.50 and B has the numerical value 8.75. (a)What are the SI units of A and B? (b)What impulse does this force impart to the object?

On its own,a certain tow-truck has a maximum acceleration of 3.0 m/s². What would be the maximum acceleration when this truck was towing a bus of twice its own mass?

The figure shows two 1.0 kg-blocks connected by a rope.A second rope hangs beneath the lower block.Both ropes have a mass of 250 g.The entire assembly is accelerated upward at 2.3 m/s² by force .What is the tension at the top end of rope 1?

Which one of the following free-body diagrams best represents the free-body diagram,with correct relative force magnitudes,of a person in an elevator that is traveling upward with an unchanging velocity? _f is the force of the floor on the person and _g is the force of gravity on the person.