A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/sS1U1P12S1S1P0 near the surface of the earth. -What is the kinetic energy of the crate when it is 4.0 m above the floor?

A) 400 J B) 250 J C) 116 J D) 704 J E) 1180 J A) 400 J B) 250 J C) 116 J D) 704 J E) 1180 J

The kinetic energy of an 1800-kg truck is 7.2 × 105 J. What is the speed of the truck?

A) 25 m/s B) 33 m/s C) 28 m/s D) 17 m/s E) 21 m/s A) 25 m/s B) 33 m/s C) 28 m/s D) 17 m/s E) 21 m/s

Use the work-energy theorem to find the force required to accelerate an electron (m = 9.11 × 10-31 kg) moving along the x axis from 4.00 × 106 m/s to 1.60 × 107 m/s in a distance of 0.0125 m.

A) 8.75 × 10-15 N B) 5.47 × 10-22 N C) 8.20 × 10-17 N D) 1.64 × 10-14 N E) 3.56 × 10-19 N A) 8.75 × 10-15 N B) 5.47 × 10-22 N C) 8.20 × 10-17 N D) 1.64 × 10-14 N E) 3.56 × 10-19 N

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/sS1U1P12S1S1P0 near the surface of the earth. -How much work was done by the force in raising the crate 4.0 m above the floor?

A) 399 J B) 250 J C) 116 J D) 704 J E) 1180 J A) 399 J B) 250 J C) 116 J D) 704 J E) 1180 J

Exam 6: Work and Energy

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s² near the surface of the earth. -What is the kinetic energy of the crate when it is 4.0 m above the floor?

(Multiple Choice)

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(68)

Question 61

Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal direction. Calculate the work that Mike does on the mower each time he pushes it 9.1 m across the yard.

(Multiple Choice)

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Question 62

A 12.5-kg crate slides along a horizontal frictionless surface at a constant speed of 4.0 m/s. The crate then slides down a frictionless incline and across a second horizontal surface as shown in the figure. -What is the kinetic energy of the crate as it slides on the lower surface?

(Multiple Choice)

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Question 63

A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the elevator cable?

(Multiple Choice)

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Question 64

A helicopter (m = 3250 kg) is cruising at a speed of 56.9 m/s at an altitude of 185 m. What is the total mechanical energy of the helicopter?

(Multiple Choice)

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Question 65

A rock is thrown straight up from the surface of the Earth. Which one of the following statements describes the energy transformation of the rock as it rises? Neglect air resistance.

(Multiple Choice)

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Question 66

The kinetic energy of an 1800-kg truck is 7.2 × 10⁵ J. What is the speed of the truck?

(Multiple Choice)

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Question 67

A roller coaster starts from rest at the top of an 18-m hill as shown. The car travels to the bottom of the hill and continues up the next hill that is 10.0 m high. How fast is the car moving at the top of the 10.0-m hill, if friction is ignored?

(Multiple Choice)

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Question 68

How much power is needed to lift a 75-kg student vertically upward at a constant speed of 0.33 m/s?

(Multiple Choice)

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Question 69

A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A. -What is the speed of the box just before it reaches point A?

(Multiple Choice)

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Question 70

A constant force of 25 N is applied as shown to a block which undergoes a displacement of 7.5 m to the right along a frictionless surface while the force acts. What is the work done by the force?

(Multiple Choice)

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Question 71

The graph shows the force component along the displacement as a function of the magnitude of the displacement. Determine the work done by the force during the interval from 2 to 10 m.

(Multiple Choice)

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Question 72

How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s?

(Multiple Choice)

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Question 73

In which one of the following situations will there be an increase in kinetic energy?

(Multiple Choice)

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Question 74

Use the work-energy theorem to find the force required to accelerate an electron (m = 9.11 × 10^-³¹ kg) moving along the x axis from 4.00 × 10⁶ m/s to 1.60 × 10⁷ m/s in a distance of 0.0125 m.

(Multiple Choice)

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(74)

Question 75

Complete the following statement: A force that acts on an object is said to be conservative if

(Multiple Choice)

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Question 76

During the construction of a high rise building, 40-kg block is vertically lifted 20 meters from the surface of the earth. To one significant figure, what is the change in the gravitational potential energy of the block?

(Multiple Choice)

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Question 77

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s² near the surface of the earth. -How much work was done by the force 11ec8750_70f2_6588_a44c_113db0bdff1a_TB34225555_11 in raising the crate 4.0 m above the floor?

(Multiple Choice)

4.7/5

(74)

Question 78

Showing 61 - 78 of 78

Exam 6: Work and Energy

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. -What is the kinetic energy of the crate when it is 4.0 m above the floor?

Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal direction. Calculate the work that Mike does on the mower each time he pushes it 9.1 m across the yard.

A 12.5-kg crate slides along a horizontal frictionless surface at a constant speed of 4.0 m/s. The crate then slides down a frictionless incline and across a second horizontal surface as shown in the figure. -What is the kinetic energy of the crate as it slides on the lower surface?

A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the elevator cable?

A helicopter (m = 3250 kg) is cruising at a speed of 56.9 m/s at an altitude of 185 m. What is the total mechanical energy of the helicopter?

A rock is thrown straight up from the surface of the Earth. Which one of the following statements describes the energy transformation of the rock as it rises? Neglect air resistance.

The kinetic energy of an 1800-kg truck is 7.2 × 105 J. What is the speed of the truck?

A roller coaster starts from rest at the top of an 18-m hill as shown. The car travels to the bottom of the hill and continues up the next hill that is 10.0 m high. How fast is the car moving at the top of the 10.0-m hill, if friction is ignored?

How much power is needed to lift a 75-kg student vertically upward at a constant speed of 0.33 m/s?

A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, brings the block to rest at point B, 19 m to the right of point A. -What is the speed of the box just before it reaches point A?

A constant force of 25 N is applied as shown to a block which undergoes a displacement of 7.5 m to the right along a frictionless surface while the force acts. What is the work done by the force?

The graph shows the force component along the displacement as a function of the magnitude of the displacement. Determine the work done by the force during the interval from 2 to 10 m.

How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s?

In which one of the following situations will there be an increase in kinetic energy?

Use the work-energy theorem to find the force required to accelerate an electron (m = 9.11 × 10-31 kg) moving along the x axis from 4.00 × 106 m/s to 1.60 × 107 m/s in a distance of 0.0125 m.

Complete the following statement: A force that acts on an object is said to be conservative if

During the construction of a high rise building, 40-kg block is vertically lifted 20 meters from the surface of the earth. To one significant figure, what is the change in the gravitational potential energy of the block?

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. -How much work was done by the force 11ec8750_70f2_6588_a44c_113db0bdff1a_TB34225555_11 in raising the crate 4.0 m above the floor?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

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A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s² near the surface of the earth. -What is the kinetic energy of the crate when it is 4.0 m above the floor?

The kinetic energy of an 1800-kg truck is 7.2 × 10⁵ J. What is the speed of the truck?

Use the work-energy theorem to find the force required to accelerate an electron (m = 9.11 × 10^-³¹ kg) moving along the x axis from 4.00 × 10⁶ m/s to 1.60 × 10⁷ m/s in a distance of 0.0125 m.

A rope exerts a force on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s² near the surface of the earth. -How much work was done by the force 11ec8750_70f2_6588_a44c_113db0bdff1a_TB34225555_11 in raising the crate 4.0 m above the floor?