We use electrical devices that produce motion, light, and sound. which aspect of energy explains why these devices are possible?
energy can’t be created.
energy can change from one form to another.
energy isn’t made of matter.
energy can’t be destroyed.

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?