Gwen releases a rock at rest from the top of a 50-m tower.If g = 9.8 m/s2 and air resistance is negligible,what is the speed of the rock as it hits the ground?

A) 28 m/s B) 31 m/s C) 56 m/s D) 784 m/s A) 28 m/s B) 31 m/s C) 56 m/s D) 784 m/s

Exam 3: Vectors and Two-Dimensional Motion: Part A

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A baseball is released at rest from the top of the Washington Monument.It hits the ground after falling for 5.0 s.What was the height from which the ball was dropped? (g = 9.8 m/s² and assume air resistance is negligible)

(Multiple Choice)

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Question 21

As a 3.0-kg bucket is being lowered into a 10-m deep well,starting from the top,the tension in the rope is 19.6 N.The acceleration of the bucket will be:

(Multiple Choice)

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Question 22

A cue ball of weight W is falling with acceleration g/2 downward and speed v.What would be the terminal velocity of this ball as it continues to fall?

(Multiple Choice)

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Question 23

A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight line path displacement of 60 m.What is the vehicle's acceleration if its value may be assumed to be constant?

(Multiple Choice)

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Question 24

A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest.If the football has a mass of 0.50 kg and time of contact with the football is 0.020 s,what is the force exerted on the foot?

(Multiple Choice)

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Question 25

A stone is thrown downward from a cliff.Take "up" to be the positive direction.Which of the following statements is true about the stone?

(Multiple Choice)

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Question 26

Assume everyone in the United States consumes one soft drink in an aluminum can every two days.If there are 300 million Americans,how many tons of aluminum need to be recycled each year if each can weighs 1/16 pound,and one ton = 2000 pounds?

(Multiple Choice)

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Question 27

An automobile of mass 2000 kg moving at 20 m/s is braked suddenly with a constant braking force of 10,000 N.How far does the car travel before stopping?

(Multiple Choice)

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Question 28

A baseball batter hits an incoming 40 m/s fastball.The ball leaves the bat at 60 m/s after a ball-on-bat contact time of 0.030 s.What is the force exerted on the 0.15 kg baseball?

(Multiple Choice)

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Question 29

A rock,released at rest from the top of a tower,hits the ground after 2.0 s.What is the speed of the rock as it hits the ground? (g = 9.8 m/s² and air resistance is negligible)

(Multiple Choice)

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Question 30

A string is attached to the ceiling.At the bottom of the string a rope of the same length as the string is attached.In the rope-string system,which of the following is the position of greatest tension? Assume the rope has more mass per unit length than the string.

(Multiple Choice)

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Question 31

A cheetah can maintain its maximum speed of 100 km/hr for 35.0 seconds.What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?

(Multiple Choice)

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Question 32

Gwen releases a rock at rest from the top of a 50-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the speed of the rock as it hits the ground?

(Multiple Choice)

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(37)

Question 33

A rock is thrown straight up with an initial velocity of 24.5 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s². )

(Multiple Choice)

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Question 34

A man of weight W_man is standing on the second floor and is pulling on a rope to lift a box of weight W_box from the floor below.The rope,which is of negligible weight,has tension T in it,but the pull of the rope is insufficient to lift the box off the floor.What is the magnitude of the normal force that the second floor exerts on the man in this situation?

(Multiple Choice)

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Question 35

A hockey puck moving at 8.0 m/s coasts to a halt in 75 m on a smooth ice surface.What is the coefficient of friction between the ice and the puck?

(Multiple Choice)

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Question 36

Two blocks,joined by a string,have masses of 6.0 and 9.0 kg.They rest on a frictionless,horizontal surface.A second string,attached only to the 6.0-kg block,has horizontal force = 45 N applied to it.Both blocks accelerate.Find the tension in the string between the blocks.

(Multiple Choice)

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Question 37

Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless,level surface.Attached to the 20-kg mass is another light string,which a person uses to pull both blocks horizontally.If the two-block system accelerates at 0.50 m/s² what is the tension in the connecting string between the blocks?

(Multiple Choice)

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Question 38

A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate.What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?

(Multiple Choice)

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Question 39

A room has 110 ft² of floor space.What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity. )

(Multiple Choice)

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Question 40

Showing 21 - 40 of 64

Exam 3: Vectors and Two-Dimensional Motion: Part A

A baseball is released at rest from the top of the Washington Monument.It hits the ground after falling for 5.0 s.What was the height from which the ball was dropped? (g = 9.8 m/s2 and assume air resistance is negligible)

As a 3.0-kg bucket is being lowered into a 10-m deep well,starting from the top,the tension in the rope is 19.6 N.The acceleration of the bucket will be:

A cue ball of weight W is falling with acceleration g/2 downward and speed v.What would be the terminal velocity of this ball as it continues to fall?

A vehicle designed to operate on a drag strip accelerates from zero to 30 m/s while undergoing a straight line path displacement of 60 m.What is the vehicle's acceleration if its value may be assumed to be constant?

A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest.If the football has a mass of 0.50 kg and time of contact with the football is 0.020 s,what is the force exerted on the foot?

A stone is thrown downward from a cliff.Take "up" to be the positive direction.Which of the following statements is true about the stone?

Assume everyone in the United States consumes one soft drink in an aluminum can every two days.If there are 300 million Americans,how many tons of aluminum need to be recycled each year if each can weighs 1/16 pound,and one ton = 2000 pounds?

An automobile of mass 2000 kg moving at 20 m/s is braked suddenly with a constant braking force of 10,000 N.How far does the car travel before stopping?

A baseball batter hits an incoming 40 m/s fastball.The ball leaves the bat at 60 m/s after a ball-on-bat contact time of 0.030 s.What is the force exerted on the 0.15 kg baseball?

A rock,released at rest from the top of a tower,hits the ground after 2.0 s.What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)

A string is attached to the ceiling.At the bottom of the string a rope of the same length as the string is attached.In the rope-string system,which of the following is the position of greatest tension? Assume the rope has more mass per unit length than the string.

A cheetah can maintain its maximum speed of 100 km/hr for 35.0 seconds.What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?

Gwen releases a rock at rest from the top of a 50-m tower.If g = 9.8 m/s2 and air resistance is negligible,what is the speed of the rock as it hits the ground?

A rock is thrown straight up with an initial velocity of 24.5 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s2. )

A hockey puck moving at 8.0 m/s coasts to a halt in 75 m on a smooth ice surface.What is the coefficient of friction between the ice and the puck?

Two blocks,joined by a string,have masses of 6.0 and 9.0 kg.They rest on a frictionless,horizontal surface.A second string,attached only to the 6.0-kg block,has horizontal force = 45 N applied to it.Both blocks accelerate.Find the tension in the string between the blocks.

A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate.What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?

A room has 110 ft2 of floor space.What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity. )

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

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A baseball is released at rest from the top of the Washington Monument.It hits the ground after falling for 5.0 s.What was the height from which the ball was dropped? (g = 9.8 m/s² and assume air resistance is negligible)

A rock,released at rest from the top of a tower,hits the ground after 2.0 s.What is the speed of the rock as it hits the ground? (g = 9.8 m/s² and air resistance is negligible)

Gwen releases a rock at rest from the top of a 50-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the speed of the rock as it hits the ground?

A rock is thrown straight up with an initial velocity of 24.5 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s². )

A room has 110 ft² of floor space.What is the approximate volume of the room? (You will need to make a reasonable estimate of a missing physical quantity. )