Physics Energy Review

The chart represents the work output and the time to do the work for four machines.

For which machine is the power output least?

A 290-N force is used to compress a spring. The spring constant of the spring is 5,880 N/m. How far is the spring compressed?

A ball is released from the top of an inclined plane as shown below. Ignoring friction, where will het potential energy (PE) and kinetic energy (KE) of the ball be at a maximum?

A 588-N person carrying 294 N of equipment starts climbing a mountain that is 3,118 m high. What is the minimum energy required for the person to climb the mountain?

A machine lifts a 35-kg object 20.0 m in 2.0 s. How much power is produced by the machine to lift the object?

A force of 50 N is required to hold an ideal spring stationary after the spring has been stretched 0.1 m from its equilibrium position. How much potential energy is stored in the stretched spring?

How much power does it take to lift a 12-N object 0.87 m in 1.3 s?

A 2.00-kg brick falls from the top of a building 6.00 m above the ground. What is the kinetic energy of the brick just before it reaches the ground?

A constant 3.0-N horizontal force is applied to a 0.10-kg object as it moves a distance of 0.20 m along a horizontal, frictionless surface. How much work does the force perform on the object?

A student walked up a flight of stairs. Later, the same student ran up the same flight of stairs in less time. What can be concluded about the relative amounts of work performed and power produced by the student in these instances?