A baseball is hit almost straight up into the air with a speed of 21 m/s. how much time does it take for the package to reach the ground?

Baseball Bat Testing Swing Force (N) Wood (Distance ft) Aluminum (Distance ft) Alloy X (Distance ft) 100 10 15 25 200 20 22 30 300 25 35 80 400 100 140 140 500 200 225 200 600 300 400 300 Which baseball bat will hit the ball the longest distance?

Jill is getting ready to push little Frank in his swing. She pulls Frank back as high as she can and then releases the swing. What is the initial transfer of energy that accelerates the swing when she lets go?

Peter and Fred are skateboarding in a large semicircular halfpipe. Peter starts out from rest at a height h and collides with Fred standing at the bottom. Peter and Fred have about the same mass. After the collision, which height will Fred reach?

Why isn't iron used to make coin

Although these quantities vary from one type of cell to another, a cell can be 2.2 micrometers in diameter with a cell wall 40 nm thick.

What evidence can you present for the possibility of time travel?

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?

As the width of an opening in a barrier increases, how will the amount of diffraction of the planar waves change as they pass through the opening? A. It will increase. B. It will decrease. C. It will remain the same.