Why does a gymnast rub powder on his hands before exercising on a set of parallel bars? (I need a scientific answer)

Explain why you can hear your friends talking in a classroom before you turn the corner.

If the power of an engine is known and the amount of time that the engine exerts this power is known, what can be calculated?

An example of a scalar is ___ and an example of a vector is ___. Question options: velocity; displacement speed; velocity velocity; acceleration distance; speed

An object will float if its density is what?

Is the reduction of copper from copper (ii) oxide by carbon exothermic or endothermic? what is the sign of the energy change?

What is a planetary nebula? a. leftover gas from a supernova explosion b. the ejected envelope of a giant star surrounding the remnant of a star c. a type of young, medium-mass star d. a planet surrounded by a glowing shell of gas e.

A train is moving 4.82 m/s when it begins to accelerate. After 24.8s it is moving 7.09m/s how far did it move in that time

List three different emotions?

The jet stream flows from east to west across the United States. True False

You are in a hot air balloon, 350 m above the flat Texas plains. You look out toward the horizon. How far out can you see--that is, how far is your horizon? The Earth's radius is about 6400 km.