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

A rubber ball weighs 49 N ... a) What is the mass of the ball? (Answer: 5.0 kg). b) What is the acceleration of the ball if an upward force of 69 N is applied? (Answer: 4.0 m/s/s). For a) I used the equation W = Fg = mg, which becomes 49 = m (9.8).

The volume of a substance must be measured several times during an experiment. Which units should be used to measure the volume of the substance? centimeters milligrams kelvins liters

What would happen if you touched the knob of a positively charged electroscope with a negatively charged object

A real heat engine operates between temperatures Tc and Th. During a certain time, an amount Qc of heat is released to the cold reservoir.

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars

What is the relationship between a planet's position in the solar system and the length of that planet's year?

The process of how rocks can tell us how old the earth is

why does a bicycle fitted with solid tyres give a bumper ride than on which has air fitted tyres

Faina says that an object cannot be in mechanical equilibrium when only a single force acts on it. do you agree or disagree? explain.

The following measurements were made to determine the density of a material whose value was, occording to the handbook of Chemistry and Physics, 3.75g/ml. Trial #1 4.75 g/ml Trial #2 4.75 g/ml Trial #3 4.74 g/ml