Find the potential energy of a 2 kg rock held 3 meters above the ground.
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- If two bodies of equal weight are kept at heights h and 1.5h respectively, then the ratio of their potential energies isProve that internal energy is the property of the system.The potential energy of water in a cylindrical tank located on top of a building 15m high, is 150 KJ. What is the diameter of the tank if the height of the water level is 3m?
- A spring, whose unstretched length is 3 ft, stretches to a length of 8 ft when a force of 10 lb is applied. If 16 ft-lb of work is applied to stretch this spring from an unstretched position, what is it's total final length?Explain the forms of energy.A 1-slug mass has a kinetic energy of 1 ft.lb when its speed is a. 0.25 ft/s c. 1 ft/sb. 1.4 ft/s d. 8 ft/s
- 5. Find the kinetic energy of a 70-kg runner who covers 400 m in 45 s at constant speed.Find the work done by pumping out molasses from a conical tank filled to 2 ft from the top of the tank. The tank has a maximum radius of 3 ft and a height of 10 ft. Molasses weighs 100 lb/ft^3. a) 1.44 x 10^4 ft-lb b)1.93 x 10^4 ft-lb c) 2.77 x 10^4 ft-lb d) 1.63 x 10^4 ft-lbIf the energy crossing the boundary of a closed system is not heat, it must be work?
- Find the work done by a variable force in two dimensions?Start with 1 lbf ft ⁄s and convert it to N⋅m/s and show that 1 lbf ⋅ ft ⁄s is equal to 1.36 W. Knowing that 550 lbf ⋅ ft ⁄s is equal to 1 hp (horsepower), how many kW is that?Calculate the energy used per day (kWh) of a car with an efficiency of 8 kilometers per liter and has driven 85 kilometers in the past 7 days