A 40.0 kg ballet dancer stands on her toes during a performance with 25.0 cm2 in contact with the floor. What is the pressure exerted by the floor over the area of contact if the dancer is stationary

Why does water have a high surface tension? Hydrogen bonding keeps water molecules close together. Water is a liquid at room temperature. Water molecules contain 18 electrons. The lengths of the bonds in water molecules can change.

Solids that are made up of particles arranged in repeating geometric patterns are called (blank)

A train travels due south at 20 m/s. It reverses its direction and travels due north at 20 m/s. What is the change in velocity of the train? 50 m/s, due south e50 m/s, due north 120 m/s, due south zero ms 40 m/s, due north

A skydiver jumped out of a plane and has a velocity of 195 mls. How long ago did he jump out of the plane?

A sprinter accelerates from rest to 10.0 m/s in 1.30s. what is the acceleration in m/s2?

If you have a beam perfectly balanced on a fulcrum and put a weight at the very end of one side, is there a way to know where you should put a heavier object on the other end?

Most of the Earth's volcanoes occuWhen fossils or minerals form, certain unstable elements are sometimes locked into them.

a man is standing on the edge of a 20.0m high cliff. he throws a rock vertically with an initial velocity of 10.0m/s. how high does the rock go?

The slope of a velocity time graph over any interval of time gives the during that interval

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength