Three masses are positioned along the x-axis.Their masses and positions are m1 = m with x1 = 1 m,m2 = 2m with x2 = 2 m,and m3 = 4m with x3 = 3 m.What is the x-coordinate of the center of mass of this system,to the nearest tenth?

A) 4.7 m B) 2.4 m C) 2.0 m D) 1.1 m E) Not enough information A) 4.7 m B) 2.4 m C) 2.0 m D) 1.1 m E) Not enough information

Two masses m1 and m2,with m1 > m2,have momenta with equal magnitudes.How do their kinetic energies compare?

A) KE1 2 B) KE1 = KE2 C) KE1 > KE2 D) More information is needed. A) KE1 2 B) KE1 = KE2 C) KE1 > KE2 D) More information is needed.

Exam 7: Rotational Motion and the Law of Gravity: Part A

A cannon of mass 1500 kg fires a 10-kg shell with a velocity of 200 m/s at an angle of 30° above the horizontal.Find the recoil velocity of the cannon across the level ground.

(Multiple Choice)

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Question 41

A railroad freight car,mass 15,000 kg,is allowed to coast along a level track at a speed of 2.0 m/s.It collides and couples with a 60,000-kg loaded second car,initially at rest and with brakes released.What percentage of the initial kinetic energy of the 15,000-kg car is preserved in the two-coupled cars after collision?

(Multiple Choice)

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Question 42

A 7.0-kg bowling ball strikes a 2.0-kg pin.The pin flies forward with a velocity of 6.0 m/s;the ball continues forward at 5.0 m/s.What was the original velocity of the ball?

(Multiple Choice)

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Question 43

Jerome pitches a baseball of mass 0.15 kg.The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s.What is the magnitude of change in the ball's momentum?

(Multiple Choice)

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Question 44

Three masses are positioned along the x-axis.Their masses and positions are m₁ = m with x₁ = 1 m,m₂ = 2m with x₂ = 2 m,and m₃ = 4m with x₃ = 3 m.What is the x-coordinate of the center of mass of this system,to the nearest tenth?

(Multiple Choice)

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Question 45

A crane drops a 0.40-kg steel ball onto a steel plate.The ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s,respectively.If the ball is in contact with the plate for 0.030 s,what is the magnitude of the average force that the ball exerts on the plate during impact?

(Multiple Choice)

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Question 46

A 4.0 ft by 8.0 ft sheet of plywood of uniform density and thickness lies in the 1^st quadrant with its long side along the x axis,one corner at the origin,and the diagonally opposite corner at position (x,y)= (8.0 ft,4.0 ft).The lower right 2.0 ft by 4.0 ft quarter of the sheet is removed from the sheet.What are the coordinates of the center of mass of the remaining portion of the sheet?

(Multiple Choice)

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Question 47

Two masses m₁ and m₂,with m₁ > m₂,have momenta with equal magnitudes.How do their kinetic energies compare?

(Multiple Choice)

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Question 48

Showing 41 - 48 of 48

Exam 7: Rotational Motion and the Law of Gravity: Part A

A cannon of mass 1500 kg fires a 10-kg shell with a velocity of 200 m/s at an angle of 30° above the horizontal.Find the recoil velocity of the cannon across the level ground.

A 7.0-kg bowling ball strikes a 2.0-kg pin.The pin flies forward with a velocity of 6.0 m/s;the ball continues forward at 5.0 m/s.What was the original velocity of the ball?

Jerome pitches a baseball of mass 0.15 kg.The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s.What is the magnitude of change in the ball's momentum?

Three masses are positioned along the x-axis.Their masses and positions are m1 = m with x1 = 1 m,m2 = 2m with x2 = 2 m,and m3 = 4m with x3 = 3 m.What is the x-coordinate of the center of mass of this system,to the nearest tenth?

A crane drops a 0.40-kg steel ball onto a steel plate.The ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s,respectively.If the ball is in contact with the plate for 0.030 s,what is the magnitude of the average force that the ball exerts on the plate during impact?

Two masses m1 and m2,with m1 > m2,have momenta with equal magnitudes.How do their kinetic energies compare?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

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 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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Three masses are positioned along the x-axis.Their masses and positions are m₁ = m with x₁ = 1 m,m₂ = 2m with x₂ = 2 m,and m₃ = 4m with x₃ = 3 m.What is the x-coordinate of the center of mass of this system,to the nearest tenth?

Two masses m₁ and m₂,with m₁ > m₂,have momenta with equal magnitudes.How do their kinetic energies compare?