When a puddle of water evaporates, does the water change into a new kind of matter

Why do astronauts need to wear pressurized suits in space? a. Because air pressure is so great in space they could be crushed without the suits. b. Because without the pressure in the suits the astronauts could freeze to death. c.

Calculate the speed of a proton having a kinetic energy of 0.995 * 10-19 J and a mass of 1.673 * 10-27 kg. Answer in units of m/s.

Suppose that the period of a particular ideal mass-spring system is 5 s. What would be the period of the system if the mass were two times the original mass?

A world-class runner can complete a 100m dash in about 10s. past studies have shown that the runners in such a race accelerate uniformly for a time t (u) and then run at a constant speed for the remainder of the race.

Electrical Force is possible because of

A 6.0-kg ball is sliding to the right at 25.0m/s and strikes a second ball (15-kg) that is initially at rest head-on. After the collision, the 6-kg ball moves to the left at 12.5m/s. What is velocity of the second ball?

At a certain harbor, the tides cause the ocean surface to rise and fall a distance d (from highest level to lowest level) in simple harmonic motion, with a period of 12.4 h. how long does it take for the water to fall a distance 0.

What is the average speed of an object with a total distance traveled of 45 meters in 50 seconds

Some machines do not multiply the force that is applied to them

An automotive research facility is testing a new design on bumpers to determine the force at which it will break.