A force acting on an object moving along the x axis is given by Fx = (14x − 3.0x2) N where x is in m. How much work is done by this force as the object moves from x = −1 m to x = +2 m?

A) +12 J B) +28 J C) +40 J D) +42 J E) −28 J A) +12 J B) +28 J C) +40 J D) +42 J E) −28 J

Exam 7: Energy of a System

Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, K_A and K_B, is

(Multiple Choice)

4.8/5

(32)

Question 21

If = 10, = 15, and α = 130°, determine the scalar product of the two vectors shown.

(Multiple Choice)

4.8/5

(33)

Question 22

Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F acts on A and a constant force 2F acts on B. Both carts start from rest. The velocities _A and _B of the bodies at the end of distance D are related by

(Multiple Choice)

4.9/5

(43)

Question 23

A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?

(Multiple Choice)

4.9/5

(35)

Question 24

The equation below is the solution to a physics problem: . The most likely physical situation it describes is

(Multiple Choice)

4.8/5

(30)

Question 25

Equal amounts of work are performed on two bodies, A and B, initially at rest, and of masses M and 2M respectively. The relation between their speeds immediately after the work has been done on them is

(Multiple Choice)

4.9/5

(33)

Question 26

The only force acting on a 1.8-kg body as it moves along the x axis is given by F_x = −(3.0x) N, where x is in m. If the velocity of the body at x = 0 is v_x = +8.0 m/s, at what value of x will the body have a velocity of +4.0 m/s?

(Multiple Choice)

4.8/5

(32)

Question 27

A 4.0-kg block is lowered down a 37° incline a distance of 5.0 m from point A to point B. A horizontal force (F = 10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 10 J and at B it is 20 J. How much work is done on the block by the force of friction between A and B?

(Multiple Choice)

4.8/5

(39)

Question 28

The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m

(Multiple Choice)

4.8/5

(31)

Question 29

A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?

(Multiple Choice)

4.8/5

(31)

Question 30

A 2.0-kg particle has an initial velocity of m/s. Some time later, its velocity is m/s. How much work was done by the resultant force during this time interval, assuming no energy is lost in the process?

(Multiple Choice)

4.7/5

(37)

Question 31

A 10-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 1.2 kN/m). The block is initially at rest at its equilibrium position when a force (magnitude P) acting parallel to the surface is applied to the block, as shown. When the block is 8.0 cm from the equilibrium position, it has a speed of 0.80 m/s. How much work is done on the block by the force P as the block moves the 8.0 cm?

(Multiple Choice)

4.8/5

(35)

Question 32

A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?

(Multiple Choice)

4.9/5

(38)

Question 33

Carts A and B have equal masses and travel equal distances on straight frictionless tracks while a constant force F is applied to A, and a constant force 2F is applied to B. The relative amounts of work done by the two forces are related by

(Multiple Choice)

4.9/5

(40)

Question 34

When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is

(Multiple Choice)

4.8/5

(44)

Question 35

A 30-kg child sitting 5.0 m from the center of a merry-go-round has a constant speed of 5.0 m/s. While she remains seated in the same spot and travels in a circle, the work the seat performs on her in one complete rotation is

(Multiple Choice)

4.8/5

(32)

Question 36

The force of static friction exerted on an automobile's tires by the ground

(Multiple Choice)

4.8/5

(37)

Question 37

Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force.

(Multiple Choice)

4.8/5

(39)

Question 38

A mass attached to the end of a spring is pulled out and released on a surface with friction. The work done on the mass by the force exerted by the spring

(Multiple Choice)

4.9/5

(32)

Question 39

A force acting on an object moving along the x axis is given by F_x = (14x − 3.0x²) N where x is in m. How much work is done by this force as the object moves from x = −1 m to x = +2 m?

(Multiple Choice)

4.9/5

(42)

Question 40

Showing 21 - 40 of 74

Exam 7: Energy of a System

Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, KA and KB, is

If = 10, = 15, and α = 130°, determine the scalar product of the two vectors shown.

Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F acts on A and a constant force 2F acts on B. Both carts start from rest. The velocities A and B of the bodies at the end of distance D are related by

A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?

The equation below is the solution to a physics problem: . The most likely physical situation it describes is

Equal amounts of work are performed on two bodies, A and B, initially at rest, and of masses M and 2M respectively. The relation between their speeds immediately after the work has been done on them is

The only force acting on a 1.8-kg body as it moves along the x axis is given by Fx = −(3.0x) N, where x is in m. If the velocity of the body at x = 0 is vx = +8.0 m/s, at what value of x will the body have a velocity of +4.0 m/s?

The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m

A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?

A 2.0-kg particle has an initial velocity of m/s. Some time later, its velocity is m/s. How much work was done by the resultant force during this time interval, assuming no energy is lost in the process?

Carts A and B have equal masses and travel equal distances on straight frictionless tracks while a constant force F is applied to A, and a constant force 2F is applied to B. The relative amounts of work done by the two forces are related by

When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is

A 30-kg child sitting 5.0 m from the center of a merry-go-round has a constant speed of 5.0 m/s. While she remains seated in the same spot and travels in a circle, the work the seat performs on her in one complete rotation is

The force of static friction exerted on an automobile's tires by the ground

Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force.

A mass attached to the end of a spring is pulled out and released on a surface with friction. The work done on the mass by the force exerted by the spring

A force acting on an object moving along the x axis is given by Fx = (14x − 3.0x2) N where x is in m. How much work is done by this force as the object moves from x = −1 m to x = +2 m?

Physics and Measurement

Motion in One Dimension

Vectors

Motion in Two Dimensions

The Laws of Motion

Circular Motion and Other Applications of Newtons Laws

Conservation of Energy

Linear Momentum and Collisions

Rotation of a Rigid Object About a Fixed Axis

Angular Momentum

Static Equilibrium and Elasticity

Universal Gravitation

Fluid Mechanics

Oscillatory Motion

Wave Motion

Superposition and Standing Waves

Temperature

The First Law of Thermodynamics

The Kinetic Theory of Gases

Heat Engines, Entropy, and the Second Law of Thermodynamics

Electric Fields

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Sources of the Magnetic Field

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarization

Relativity

Introduction to Quantum Physics

Quantum Mechanics

Atomic Physics

Molecules and Solids

Nuclear Structure

Particle Physics and Cosmology

Filters

Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, K_A and K_B, is

Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force F acts on A and a constant force 2F acts on B. Both carts start from rest. The velocities _A and _B of the bodies at the end of distance D are related by

The only force acting on a 1.8-kg body as it moves along the x axis is given by F_x = −(3.0x) N, where x is in m. If the velocity of the body at x = 0 is v_x = +8.0 m/s, at what value of x will the body have a velocity of +4.0 m/s?

A force acting on an object moving along the x axis is given by F_x = (14x − 3.0x²) N where x is in m. How much work is done by this force as the object moves from x = −1 m to x = +2 m?