How can we run out of energy if energy cannot be created or destroyed?

Experiment to determine the cubic expansivity of a liquid

Who first proposed that each layer of rock represented a specific interval of geologic time?

Involves the transformation of chemical energy directly into light energy?

Starting at the same time, an arrow and a ball are shot horizontally with a speeds of 50 m/s and 44 m/s respectively from the top of a building over flat ground. Which best describes what happens? A.

If energy is conserved, why do people get tired, and why are we running short on "energy supplies?"

A radio wave has a wavelength of 300 m. The wave moves with a speed of 3.0 * 108 m/s. What is the frequency of the radio wave? A. 1.0 * 106 Hz B. 1.0 * 10-5 Hz C. 1.0 * 10-6 Hz D. 1.0 * 105 Hz

What is the momentum of a 0.145 kg baseball traveling at 40.0 m/s

To analyze the motion of a body that is traveling along a curved path, to determine the body's acceleration, velocity, and position. A motorcyclist travels around a curved path that has a radius of 250 ft.

You walk with a velocity of 2 m/s north. You see a man approaching you, and from your frame of reference he has a speed of 3 m/s to the south.

Imagine you are holding an apple. Does this apple have energy? how do you know?