Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?

You serve a volley ball with a mass of 1.5 kg. The ball leaves your hand at 15m/s. The ball has how much kinetic energy?

The density of a material is calculated by:

By how much does his gravitational potential energy change during this climb?

A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the ground wants to feed the monkey. He uses a bow and arrow to launch the food to the monkey.

Where are iron and aluminum often found?

An arrow is shot upward on mars from ground level with a velocity of 60 meters per second. Its height (in meters) after t seconds is given by 2 s (t) = 60t - 1.9t^2.

What are (a) the lowest frequency, (b) the second lowest frequency, (c) the third lowest frequency of transverse vibrations on a wire that is 10.0m long, has a mass of 100g, and is stretched under tension of 250 N?

Why is a rock salt crystal likely to shatter when struck

Find the speed required to throw a ball straight up and have it return 6 seconds later. neglect air resistance. how high does the ball go?

Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?