1pt A ball with mass (m) is dropped from a certain height. Which equality could be rearranged to find the velocity of the
ball after it has fallen through a certain distance?
A. (1/2) mv2 = mgah
B. (1/2) mv2 = (1/2) kx2
c. 1/2mv2= kq1q2/r
D. mgAh = (1/2)kx2

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.