we often talk about the speed of sound and the speed of light. sound and light are two different types of waves. what do you think we mean when we talk about the ""speed"" of a wave?

28. a stone is projected at a cliff of height h with an initial speed of 42.0 mls directed at angle θ0 = 60.0° above the horizontal. the stone strikes at a, 5.50 s after launching. find (a) the height h of the cliff, (b) the speed of the stone just before impact at a, and (c) the maximum height h reached above the grou

What are atoms of the same element with varying number of neutrons

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?