Where does the energy form to give the roller coaster potential energy at the top of the first hill?

Gamma rays are waves of energy that have no charge.

A ball thrown with 50N of force accelerates at 25 m/s2. What is the mass of the ball?

The human vocal tract is a pipe that extends about 17 cm from the lips to the vocal folds (a. k. a. vocal cords) near the middle of your throat. The vocal folds behave rather like the reed of a clarinet, and the vocal tract acts like a closed pipe.

An astronaut is on a new planet. She discovers that is she drops a space rock from 12m above the groundnut has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?

L'aigua es una mescla de d'oxigen i hidrogen

A worker pushes horizontally on a large crate with force of 298 N and the crate is moved 4.3 m. How much work was done?

What would happen to the volume of a ballon left on a sunny window sill and which gas law pridict this result

An open-topped freight car with mass 24,000 kg is coasting without friction along a level track. It is raining very hard, and the rain is falling vertically downward. Originally, the car is empty and moving with a speed of 4.00 m/s.

Photons travel outward from a light bulb in

The critical angle for a beam of light passing from water into air is 48.8°. this means that all light rays with an angle of incidence in the water that is greater than 48.8° will be