Posts by bee-z
Total # Posts: 3
A tennis ball (m 57 g) is projected vertically with an initial speed of 8.8 m/s. (a) If the ball rises to a maximum height of 3.7 m, how much kinetic energy was dissipated by the drag force of air resistance? (b) How much higher would the ball have gone in a vacuum?
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moons surface. Ignore air drag from the Earths atmosphere. Hint: The spacecraft will not have zero velocity when...
A rock is dropped from a tree of height 25 m into a lake (depth 5.0 m) below. After entering the water, the rock then fl oats gently down through the water at a speed of 1.5 m/s to the bottom of the lake. What is the total elapsed time?