Homework Statement
An 80 kg man jumps from a height of 3.00 m onto a platform mounted on springs. As the springs compress, the platform is pushed down a maximum distance of 0.200 m below its initial position, and then it rebounds. The platform and springs have negligible mass.
a. what is the...
Homework Statement
A pump is required to lift 800 kg. ( about 200 gallons) of water per minute from a well that is 14.0 m deep and eject it with a speed of 30 m/s
a.) how much work is done per minute in lifting the water?
b.) how much in giving it kinetic energy?
Homework Equations
W =...
this is what i did:
first i solved for the potential energy
PE = mgh = 6(9.8)(2) = 117.6 J
then i solved for the force done on the block
F = ų*mg = (0.25)(6)(9.8) = 14.715 N
then i solved for the work done on the block
W = (14.715)(2) = 29.43
then i solved for the kinetic energy
KE = PE - W =...
Homework Statement
Consider the system shown. The coefficient of kinetic friction between the 8.00 kg block and the tabletop is ųk = 0.25. Neglect the mass of the rope and of the pulley, and assume that the pulley is frictionless. Use energy methods to calculate the speed of the 6.00 kg...