Work & Energy

Work and Energy

Work & Energy Principles

Articles
Title
A rifle fires a 4.0-g bullet at a velocity of 950 m/s. If the length of the rifle barrel is 1.01 m, then what force does the rifle exert on the bullet?
Two cars skid to a stop. How does the skid distance of a 100-kg car moving at 30 miles per hour compare to the skid distance of a 50-kg car moving at 15 miles per hour?
A 1000-kg car traveling at 30 m/s skids 10 m before it stops. What magnitude of force is the frictional force on the car?
A tall sailing ship (m = 1.43 x 10^4 kg) is initially at rest. A steady wind blows at the 60.0° angle shown in the diagram and moves the ship forward a distance of 850 km. The ships final speed is 9.0 m/s.What is the average force of the wind?
How much work is done to accelerate a 5-kg object from 6 m/s to a speed of 12 m/s?
A mover uses a pulley system to lift a grand piano with a mass of 500 kg from the ground to a height of 10 m. What is the change in the pianos gravitational potential energy?
A 70-kg man runs at a constant velocity of 2 m/s. What is his kinetic energy?
Spring 1 is stretched and stores 2 J of elastic potential energy. An identical spring, Spring 2, is stretched and stores 18 J of elastic potential energy. What is the ratio of the displacement of Spring 2 to the displacement of Spring 1?
A 9.0-kg box is attached to a horizontal spring with a spring constant of 2500 N/m. If the box is pulled 12 cm horizontally from the equilibrium position, what is its maximum kinetic energy?
An object is initially at rest. A force of 2 N exerted on an object for5 m increases the objects velocity by 1 m/s. What was the mass of the object?

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