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

Which one of the following is NOT a simple machine? A. Wheel and axle. B. Inclined Plane. C. Lever. D. Bicycle

What is an example of a simple machine? A. an electric light B. a small buzzer C. a car D. a screwdriver

The distance a wave moves from resting position

A girl sitting on a merry-go-round moves counterclockwise through an arc length of 2.38 m. If the girl's angular displacement is 2.94 rad, how far is she from the center of the merry-go-round? Answer in units of m.

Determine the displacement of a plane that is uniformly accelerated from 66 m/s to 88 m/s in 12 sec

You measure the magnetic field of a long, current-carrying wire to be B is equal to start fraction 50 times mu naught over pi end fraction at a distance of r = 7.5 cm. How much current is running through the wire?

In any food chain or web, the original source of energy is

Which organisms develop gills from pharyngeal arches and later develop lungs to breathe on land

How much energy (in joules) is required to evaporate 0.0005 kg of liquid ammonia to vapor at the same temperature?

It is 5.5 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisurely at 3.0 km/h (which uses energy at 290 W).