Pushing on the pump of a soap dispenser compresses a small spring. when the spring is compressed 0.54 cm, its potential energy is 0.0025 j. (a) what is the force constant of the spring? (answer is in kn/m) (b) what compression is required for the spring potential energy to equal 0.0078 j? (answer is in cm),

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)