Which atom contains exactly 15 protons

What is the speed of a bobsled whose distance-time graph indicates that it traveled 121m in 30s?

Which scientist's work led to our understanding of how planets move around the Sun?

You apply 100.0n of force to a machine. the machine applies 20.0n of force to the load. what is the mechinical advantage of the macheine

Bill and Nageen have each built an electric motor and they are testing them by having them lift boxes. Bill's motor lifts a box 0.35 metres in 2 seconds. Nageen's motor lifts the same box 0.35 metres in 1.8 seconds.

How are force and acceleration related?

Why do some elements have symbols that don't use letters in the element's name?

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.

What are the two types of surface waves? How are they different and which one would cause more damage? Explain.

What causes a regular reflection?

43.278 kg - 28.1 g use significant figures rule