An element is a substance composed of atoms that all have the same number of protons.

A. True

B. False

Forces that are equal strength in opposite in direction are

Desribe the measurements necessary to find the average speed of a high school track athlete

How does wind power generate electricity? A. Air currents spin a propeller that drives a turbine-electrical generator. B. Hot air converts water to steam and drives a turbine-electrical generator. C.

Having some knowledge of psychology, you'll shine your shoes and "dress for success" before going to a job interview because you want to

A luggage handler pulls a 20.0 kg suitcase up a ramp inclined at 33.0 ∘ above the horizontal by a force F⃗ of magnitude 161 N that acts parallel to the ramp. The coefficient of kinetic friction between the ramp and the incline is μk = 0.300.

How long did the astronauts stay on the moon?

Brenda is standing on the beach; the sea is choppy. she observes that the crests of distant waves appear not only smaller, but also closer together than do the crests of waves nearer the beach. this example illustrates a depth cue known as:

If two waves in the same space interfere completely destructively, which of the following occurs? A. The amplitude decreases. B. The amplitude increases. C. The wave speed increases. D. The wave speed decreases.

An electric force exists between which pair of objects? Check all that apply. A) a neutral object and a negative object two negative objects B) a neutral object and a positive object C) two positive objects D) a negative object and a positive object

A person jogs 40 km in 32 minutes then 20 km in 22 minutes and finally 10 km in 16 minutes what is his average speed in in per minute