3. Ignoring friction how much effort is required to lift the load?
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- 1. You lift a heavy book from a table to a high shelf. List the forces on the book during this process, and state whether each is conservative or nonconservative.How much more gravitational potential energy does a 2.0 kg hammer have hen it is opn a table 1.5 m high then when it is on a chair 0.45 m high? 5.11. The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. Minimum power rating of the motor should be
- Question 10) Sasha pushes a 15 kg cart full of donated books through a 5.0 m fong starting area. The cart is then released and must reach the top of the hill 2.5 m in height, as shown in the diagram below, He must apply enough force on the cart so that the cart is able to travel along the 80 m path and reach the top of the hill. The force of Tnction between the 8.0 m path and the cart is 11.0 N. What minimum force on the cart in the starting area is required to get it to the top of the hill? Stopping point 8.0 m 2.5 m Mass = 15 kg 5.0 m Starting area terW1. A body of weight 450 N is pulled up an inclined plane, by a force of 300 N. The inclination of the plane is 30° to the horizontal and the force is applied parallel to the plane. Determine the co-efficient of friction.1. How much work is required for a mechanical hoist to lift a 9000. N automobile to a height of 1.800 m for repairs?
- 4. Calculate the power made by a 50-kg boy running up the stairs with a height of 3.00 m in 2.50 s.5). Which requires more work, pushing a 200 kg refrigerator up a ramp into a truck, or lifting it straight up and setting it in the truck? Explain.1. To compress spring 1 by 0.20m takes 150 J of work. Stretching spring 2 by 0.30m requires 210J of work. Which spring is stiffer? Explain and draws.
- 4. A 3000 lb elevator is supported by a 14 ft cable that weighs 15 lbs/ft. Find the work required to lift the elevator 12 feet by winding the cable. (Hint: Calculate the work required to pull the rope up, then add the work required for the elevator.)13. True or false, Kinetic energy is the quantity that measures the amount of work that goes into the motion of an object15