Exam 4: Applying Newtons Laws

In a shuffleboard game,the puck slides a total of 12 m on a horizontal surface before coming to rest.If the coefficient of kinetic friction between the puck and board is 0.10,what was the initial speed of the puck?

(Multiple Choice)

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Question 41

A ball rolls over the edge of a platform with a horizontal velocity of magnitude v.The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m.What is the magnitude of v if you can ignore air?

(Short Answer)

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Question 42

For general projectile motion if we neglect air,the vertical component of a projectile's acceleration

(Multiple Choice)

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Question 43

A 50-kg box is resting on a horizontal floor.A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box.The coefficient of static friction between the box and the surface is 0.40,and the coefficient of kinetic friction is 0.30.What is the force of friction exerted by the floor on the box?

(Multiple Choice)

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Question 44

A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure.What is the magnitude of the force F?

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Question 45

Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure.Package A has a mass of 3.0 kg and can slide along a rough plane inclined at 30° above the horizontal.The string pulls on package A parallel to the surface of the plane.The coefficient of static friction between package A and the plane is 0.40.What minimum mass should package B have in order to start package A sliding up the ramp?

(Short Answer)

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Question 46

As shown in the figure,a 10-kg block on a perfectly smooth horizontal table is connected by a horizontal string to a 63-kg block that is hanging over the edge of the table.What is the magnitude of the acceleration of the 10-kg block when the other block is gently released?

(Multiple Choice)

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Question 47

Vector $\vec { A }$ is along the +x-axis and vector $\vec { B }$ is along the +y-axis.Which one of the following statements is correct with respect to these vectors?

(Multiple Choice)

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Question 48

A 50-kg box is being pushed along a horizontal surface.The coefficient of static friction between the box and the ground is 0.65,and the coefficient of kinetic friction is 0.35.What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s²?

(Multiple Choice)

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Question 49

A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N that is parallel to the slope.The coefficient of kinetic friction between the block and the slope is 0.200.What is the acceleration of the block?

(Multiple Choice)

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Question 50

A player throws a football 50.0 m at 61.0° north of west.What is the westward component of the displacement of the football?

(Multiple Choice)

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Question 51

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 52

A 5.0-kg block and a 4.0-kg block are connected by a 0.6 kg rod,as shown in the figure.The links between the blocks and the rod are denoted by A and B.A vertical upward force of magnitude F is exerted on the upper block.The blocks and rod assembly are moving downward at constant velocity of 85 cm/s. (a)What is the magnitude of the applied force F? (b)What magnitude force does link A exert?

(Short Answer)

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Question 53

When Jeff ran up a hill at 7.0 m/s,the horizontal component of his velocity vector was 5.1 m/s.What was the vertical component of Jeff's velocity?

(Multiple Choice)

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Question 54

The magnitude of a vector can never be less than the magnitude of any of its components.

(True/False)

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Question 55

A girl throws a rock horizontally with a speed of 12 m/s from a bridge.It falls 2.28 s before hitting the water below.Neglect air. (a)How high is the bridge from the water below? (b)How far horizontally does the rock travel before striking the water?

(Short Answer)

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Question 56

Two boxes,A and B,are connected by a horizontal string S on a horizontal floor.A very light wire pulls horizontally on box B,as shown in the figure,exerting a force of 100 N.The Newton's third law pair force to this pull is

(Multiple Choice)

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Question 57

A hunter points a rifle horizontally and holds it 3.30 m above the ground.The bullet leaves the barrel at 325 m/s.Ignore air and assume that free-fall acceleration is 9.80 m/s². (a)How long does it take for the bullet to strike the ground? (b)How far horizontally does it travel?

(Short Answer)

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Question 58

Jason takes off across level water on his jet-powered skis.The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible).Water exerts a force of 200 N on the skis.The coefficient of kinetic friction between skis and water is 0.10.Unfortunately,the skis run out of fuel after only 90 s.What is Jason's top speed?

(Multiple Choice)

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Question 59

You throw a rock horizontally off a cliff with a speed of 20 m/s.Assuming no effects of air,after 2.0 s,the magnitude of the velocity of the rock is closest to

(Multiple Choice)

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Question 60

Showing 41 - 60 of 178

Exam 4: Applying Newtons Laws

In a shuffleboard game,the puck slides a total of 12 m on a horizontal surface before coming to rest.If the coefficient of kinetic friction between the puck and board is 0.10,what was the initial speed of the puck?

A ball rolls over the edge of a platform with a horizontal velocity of magnitude v.The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m.What is the magnitude of v if you can ignore air?

For general projectile motion if we neglect air,the vertical component of a projectile's acceleration

A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure.What is the magnitude of the force F?

As shown in the figure,a 10-kg block on a perfectly smooth horizontal table is connected by a horizontal string to a 63-kg block that is hanging over the edge of the table.What is the magnitude of the acceleration of the 10-kg block when the other block is gently released?

Vector A⃗\vec { A }A is along the +x-axis and vector B⃗\vec { B }B is along the +y-axis.Which one of the following statements is correct with respect to these vectors?

A 50-kg box is being pushed along a horizontal surface.The coefficient of static friction between the box and the ground is 0.65,and the coefficient of kinetic friction is 0.35.What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?

A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N that is parallel to the slope.The coefficient of kinetic friction between the block and the slope is 0.200.What is the acceleration of the block?

A player throws a football 50.0 m at 61.0° north of west.What is the westward component of the displacement of the football?

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?

When Jeff ran up a hill at 7.0 m/s,the horizontal component of his velocity vector was 5.1 m/s.What was the vertical component of Jeff's velocity?

The magnitude of a vector can never be less than the magnitude of any of its components.

A girl throws a rock horizontally with a speed of 12 m/s from a bridge.It falls 2.28 s before hitting the water below.Neglect air. (a)How high is the bridge from the water below? (b)How far horizontally does the rock travel before striking the water?

Two boxes,A and B,are connected by a horizontal string S on a horizontal floor.A very light wire pulls horizontally on box B,as shown in the figure,exerting a force of 100 N.The Newton's third law pair force to this pull is

A hunter points a rifle horizontally and holds it 3.30 m above the ground.The bullet leaves the barrel at 325 m/s.Ignore air and assume that free-fall acceleration is 9.80 m/s2. (a)How long does it take for the bullet to strike the ground? (b)How far horizontally does it travel?

You throw a rock horizontally off a cliff with a speed of 20 m/s.Assuming no effects of air,after 2.0 s,the magnitude of the velocity of the rock is closest to

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Vector $\vec { A }$ is along the +x-axis and vector $\vec { B }$ is along the +y-axis.Which one of the following statements is correct with respect to these vectors?

A 50-kg box is being pushed along a horizontal surface.The coefficient of static friction between the box and the ground is 0.65,and the coefficient of kinetic friction is 0.35.What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s²?

A hunter points a rifle horizontally and holds it 3.30 m above the ground.The bullet leaves the barrel at 325 m/s.Ignore air and assume that free-fall acceleration is 9.80 m/s². (a)How long does it take for the bullet to strike the ground? (b)How far horizontally does it travel?