Unit 3: Work, Energy and Power
Showing 20 of 43 questions
A 2 kg ball is dropped from a height of 5 m. What is its speed just before hitting the ground? (g = 10 m/s²)
A spring with k = 200 N/m is compressed 0.1 m. How much elastic potential energy is stored?
A 5 kg object is lifted 3 m vertically. The work done against gravity is (g = 10 m/s²)
A spring with spring constant k = 200 N/m is compressed 0.1 m. The elastic potential energy stored in the spring is
A roller coaster car (mass 500 kg) starts from rest at the top of a 40 m hill and reaches the bottom. If 20% of the energy is lost to friction, its speed at the bottom is approximately
The kinetic energy of a 2 kg object moving at 3 m/s is
A force of 100 N is applied at a 60° angle to the horizontal to push a box 5 m along a horizontal floor. The work done by the force is
An engine does 6000 J of work in 2 seconds. The power output is
A 0.5 kg ball is dropped from a height of 5 m. Just before hitting the ground, its kinetic energy is (assuming no air resistance, g = 10 m/s²)
If the speed of an object is tripled, its kinetic energy is multiplied by
A 2 kg ball is dropped from 20 m. If 20% of its energy is lost to air resistance, its speed just before hitting the ground is (g = 10 m/s²)
A car engine produces 5000 W of power. How much work does it do in 2 minutes?
A 0.5 kg ball is thrown straight up at 20 m/s. Using energy conservation, the maximum height reached is (g = 10 m/s²)
A roller coaster car of mass 500 kg is at the top of a 40 m hill. Its speed at the bottom of the hill, assuming no friction, is (g = 10 m/s²)
A 1500 kg car goes around a circular turn of radius 50 m at 20 m/s. What centripetal force is needed?
If you triple the distance between two objects, the gravitational force between them:
For a car turning on a flat road, the centripetal force is provided by:
An object completes one full revolution of radius 10 m in 4 seconds. What is its speed?
A satellite in orbit around Earth is held in orbit by:
If the mass of one object in a gravitational interaction is doubled, the gravitational force:
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