What is electricity?
a. the movement of electrons due to a difference in electric potential energy.
b. the movement of protons due to a difference in electric potential energy.
c. the movement of neutrons due to a waterfall. (i know it's not this one.)
d. the movement of electrons due to kinetic energy.

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?

What are some important factors to consider when choosing a warm-up before your workout?