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

Assuming that the smallest measurable wavelength in an experiment is 0.610 fm (femtometers), what is the maximum mass of an object traveling at 199 m·s-1 for which the de Broglie wavelength is observable?.

A gaseous decay product of uranium that is found in rocks is called

Old cannons were built on wheeled carts, both to facilitate moving the canon and to allow the canon to recoil when fired. When a 200 kg canon in car recoils at 1.7 m/s, at what velocity would a 10 kg cannonball leave the Cannon?

What do simple machines accomplish

Which statements describe the process of scientific inquiry? Check all that apply.

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?