A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 10S1U1P14S1S1P0 kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/sS1U1P12S1S1P0. -Determine the magnitude of the acceleration of the spacecraft.

A) 51.4 m/s2 B) 0.36 m/s2 C) 2.5 × 10-3 m/s2 D) 7.0 × 10-3 m/s2 E) 3.97 × 10-4 m/s2 A) 51.4 m/s2 B) 0.36 m/s2 C) 2.5 × 10-3 m/s2 D) 7.0 × 10-3 m/s2 E) 3.97 × 10-4 m/s2

A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 10S1U1P14S1S1P0 kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/sS1U1P12S1S1P0. -Which one of the following statements concerning this situation is true?

A) The spacecraft does not move, but the astronaut moves to the right with a constant speed. B) The astronaut stops moving after he stops pushing on the spacecraft. C) The force exerted on the astronaut is larger than the force exerted on the spacecraft. D) The force exerted on the spacecraft is larger than the force exerted on the astronaut. E) The velocity of the astronaut increases while he is pushing on the spacecraft. A) The spacecraft does not move, but the astronaut moves to the right with a constant speed. B) The astronaut stops moving after he stops pushing on the spacecraft. C) The force exerted on the astronaut is larger than the force exerted on the spacecraft. D) The force exerted on the spacecraft is larger than the force exerted on the astronaut. E) The velocity of the astronaut increases while he is pushing on the spacecraft.

Exam 4: Forces and Newtons Laws of Motion

A block of weight W is suspended by a string of fixed length.The ends of the string are held at various positions as shown in the figures below. In which case, if any, is the magnitude of the tension along the string the largest?

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Question 1

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A block is pulled at constant speed along a rough level surface by a rope that makes an angle of 30° with respect to the horizontal.The applied force along the rope is .The force of kinetic friction between the block and the surface is 10 N. -Which one of the following expressions gives the magnitude of the force in SI units?

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Question 2

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A block of mass M is hung by ropes as shown.The system is in equilibrium.The point O represents the knot, the junction of the three ropes.Which of the following statements is true concerning the magnitudes of the three forces in equilibrium?

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Question 3

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A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 10⁴ kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s². -Determine the magnitude of the acceleration of the spacecraft.

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Question 4

Two forces act on a 16-kg object.The first force has a magnitude of 68 N and is directed 24° north of east.The second force is 32 N, 48° north of west.What is the acceleration of the object resulting from the application of these two forces to the object?

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Question 5

A block is pulled along a rough level surface at constant speed by the force .The figure shows the free-body diagram for the block. represents the normal force on the block; and represents the force of kinetic friction. -What is the magnitude of ?

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Question 6

Complete the following statement: The magnitude of the normal force could be reduced by

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Question 7

A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N as shown in the figure.The coefficient of static friction, $\mu$ _s, between the block and the wall is 0.60; and the coefficient of kinetic friction, $\mu$ _k, is 0.40.Which one of the following statements is true, if the block is initially at rest? $A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N as shown in the figure.The coefficient of static friction, \mu s, between the block and the wall is 0.60; and the coefficient of kinetic friction, \mu k, is 0.40.Which one of the following statements is true, if the block is initially at rest?$

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Question 8

A 250-N force is directed horizontally as shown to push a 29-kg box up an inclined plane at a constant speed.Determine the magnitude of the normal force, F_N, and the coefficient of kinetic friction, µ_k. F_N µ_k

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Question 9

A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown.The rope may be considered massless; and the pulley may be considered frictionless.The coefficient of static friction between the block and the plane is µ_s; and the coefficient of kinetic friction is $\mu$ _k. $A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown.The rope may be considered massless; and the pulley may be considered frictionless.The coefficient of static friction between the block and the plane is µs; and the coefficient of kinetic friction is \mu k. -If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane?$ -If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane?

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Question 10

What is the weight of a 2.50-kg bag of sand on the surface of the earth?

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Question 11

A 71-kg man stands on a bathroom scale in an elevator.What does the scale read if the elevator is ascending with an acceleration of 3.0 m/s²?

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Question 12

Two identical blocks are pulled along a rough surface as suggested in the figure.Which one of the following statements is false?

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Question 13

Two 5-N boxes are attached to opposite ends of a spring scale and suspended from pulleys as shown. -Suppose that the system were placed in an elevator that accelerates downward at 2 m/s².What would the scale read?

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Question 14

Under what condition(s) will an object be in equilibrium?

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Question 15

A book is resting on the surface of a table.Consider the following four forces that arise in this situation: (1) the force of the earth pulling on the book (3) the force of the book pushing on the table (2) the force of the table pushing on the book (4) the force of the book pulling on the earth -The book has an acceleration of 0 m/s².Which pair of forces, excluding "action-reaction" pairs, must be equal in magnitude and opposite in direction?

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Question 16

A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m.What is the magnitude of the average net force acting on the car?

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Question 17

A spring scale is fastened to the ceiling of a railway car.When a 1.0-kg block is hung from the scale, it reads 12 N and is oriented as shown in the figure. What is the approximate acceleration of the car as measured by an observer at rest on the ground outside of the car?

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Question 18

In which section of the graph is the magnitude of the net force decreasing?

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Question 19

A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 10⁴ kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s². -Which one of the following statements concerning this situation is true?

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Question 20

Showing 1 - 20 of 103

Exam 4: Forces and Newtons Laws of Motion

A block of weight W is suspended by a string of fixed length.The ends of the string are held at various positions as shown in the figures below. In which case, if any, is the magnitude of the tension along the string the largest?

A block of mass M is hung by ropes as shown.The system is in equilibrium.The point O represents the knot, the junction of the three ropes.Which of the following statements is true concerning the magnitudes of the three forces in equilibrium?

A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 104 kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s2. -Determine the magnitude of the acceleration of the spacecraft.

Two forces act on a 16-kg object.The first force has a magnitude of 68 N and is directed 24° north of east.The second force is 32 N, 48° north of west.What is the acceleration of the object resulting from the application of these two forces to the object?

A block is pulled along a rough level surface at constant speed by the force .The figure shows the free-body diagram for the block. represents the normal force on the block; and represents the force of kinetic friction. -What is the magnitude of ?

Complete the following statement: The magnitude of the normal force could be reduced by

A 250-N force is directed horizontally as shown to push a 29-kg box up an inclined plane at a constant speed.Determine the magnitude of the normal force, FN, and the coefficient of kinetic friction, µk. FN µk

What is the weight of a 2.50-kg bag of sand on the surface of the earth?

A 71-kg man stands on a bathroom scale in an elevator.What does the scale read if the elevator is ascending with an acceleration of 3.0 m/s2?

Two identical blocks are pulled along a rough surface as suggested in the figure.Which one of the following statements is false?

Two 5-N boxes are attached to opposite ends of a spring scale and suspended from pulleys as shown. -Suppose that the system were placed in an elevator that accelerates downward at 2 m/s2.What would the scale read?

Under what condition(s) will an object be in equilibrium?

A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m.What is the magnitude of the average net force acting on the car?

A spring scale is fastened to the ceiling of a railway car.When a 1.0-kg block is hung from the scale, it reads 12 N and is oriented as shown in the figure. What is the approximate acceleration of the car as measured by an observer at rest on the ground outside of the car?

In which section of the graph is the magnitude of the net force decreasing?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Dynamics of Uniform Circular Motion

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Rotational Kinematics

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The Principle of Linear Superposition and Interference Phenomena

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The Reflection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

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The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

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A 70.0-kg astronaut pushes to the left on a spacecraft with a force in "gravity-free" space.The spacecraft has a total mass of 1.0 × 10⁴ kg.During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s². -Determine the magnitude of the acceleration of the spacecraft.

A 250-N force is directed horizontally as shown to push a 29-kg box up an inclined plane at a constant speed.Determine the magnitude of the normal force, F_N, and the coefficient of kinetic friction, µ_k. F_N µ_k

A 71-kg man stands on a bathroom scale in an elevator.What does the scale read if the elevator is ascending with an acceleration of 3.0 m/s²?

Two 5-N boxes are attached to opposite ends of a spring scale and suspended from pulleys as shown. -Suppose that the system were placed in an elevator that accelerates downward at 2 m/s².What would the scale read?