1. How much work is required for a mechanical hoist to lift a 9000-N automobile to a height of 1.80 m for repairs?
2. A hay wagon is used to move bales from the field to the barn. The tractor pulling the wagon exerts a constant force of 350 lb. The distance from field to barn is mi. How much work (ft lb) is done in moving one load of hay to the barn?
3. A worker lifts 75 concrete blocks a distance of 1.50 m to the bed of a truck. Each block has a mass of 4.00 kg. How much work is done to lift all the blocks to the truck bed?
4. The work required to lift eleven 94.0-lb bags of cement from the ground to the back of a truck is 4340 ft lb. What is the distance from the ground to the bed of the truck?
5. How much work is done in lifting 450 lb of cement 75 ft above the ground?
6. How much work is done lifting a 200-kg wrecking ball 6.50 m above the ground?