A theory is an explanation of observable facts and phenomena. True of false.

A spaceship is built to reach a star system 15 light-years away. (a) How fast must the spaceship move (in units of c) so that the round trip time experienced by the crew is 20 years?

Speed is a measure of A. how long an object can travel with no energy. B. the amount of mass per unit volume of a material. C. how far an object travels in a certain amount of time. D.

What is meant by atmosperic refraction of light?

Which statement best compares momentum and kinetic energy?

Determine the x intervept of the line from equation 8x - 5y = - 11

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away. A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

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