4. A block of mass m is connected to a spring of spring constant k and is initially at the top of a frictionless hemisphere of radius R. The block is given a slight nudge and slides down the hemisphere. Using work-kinetic energy methods, find the maximum velocity of the block. {Your answer may be in terms of 0, g, k, R and m}

Question 12

Which of the following force is doing a positive work on the box? The box is displaced to the right as shown. Select all apply.

A 3.2-kg bucket of water is lifted vertically 2 m How much work against gravity is done?  Use g = 9.8 m/s2 Calculate to one decimal