A bucket filled with sand has a total mass of 25 kg. Your friend begins steadily lifting the bucket to the top of a building 20 meters above the ground using a cable of negligible mass, but the bucket has a hole in it and leaks 0.3 kg of sand for each meter your friend lifts it. The work your friend does lifting the bucket to the top of the building is: Joules

A bucket of water of mass 20 kg is pulled at constant velocity up to a platform 30 meters above the ground. This takes 18 minutes, during which time 5 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to raise the bucket to the platform. (Use ?=9.8m/s2 calculate work with unit

Your job is to lift 25.0 kg packaged boxes a vertical distance of 1.0 m from the ground onto the bed of a delivery truck. How many packaged boxes would you have to load onto the truck in one minute for your average output power that goes into lifting the boxes to be 0.11 hp?

Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown in the figure below. The monument is made from tens of thousands of small stone blocks of density 3 293 kg/m. The monument is 14.0 m high and 64.0 m wide at its base and is everywhere 2.50 m thick from front to back. Before the monument was built many years ago, all the stone blocks lay on the ground. How much work did laborers do on the blocks to put them in position while building the entire monument? Note: The gravitational potential energy of an object-Earth system is given by U, = Mgy CM, where M is the total mass of the object and yCM is the elevation of its center of mass above the chosen reference level.