If an air traffic controller is describing the speed of an airplane as well as the direction in which it should begin its decent, then the air traffic controller is describing the airplane's

a. magnitude.
b. velocity.
c. speed.
d. acceleration.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

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?