g A spaceship carrying a light clock moves at a speed of 0.90c relative to an observer on Earth. If the clock on the ship advances by 2.00 s as measured by the space travelers aboard the ship, how long did that advance take as measured by the observer on Earth

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

What are similarities and differences of reflection, refraction, diffraction and absorption?