The figure belows shows an object whose mass is 25 lb attached to a rope wound around a pulley. The radius of the pulley is R = 3 in. Pulley R |V = 5 ft/s If the mass falls at a constant velocity of 5 ft/s, determine the power transmitted to the pulley, in hp, and the rotational speed of the shaft, in revolutions per minute (RPM). The acceleration of gravity is 32.2 ft/s?

The figure belows shows an object whose mass is 25 lb attached to a rope wound around a pulley. The radius of the pulley is R = 3 in. Pulley R |V = 5 ft/s If the mass falls at a constant velocity of 5 ft/s, determine the power transmitted to the pulley, in hp, and the rotational speed of the shaft, in revolutions per minute (RPM). The acceleration of gravity is 32.2 ft/s?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?

See similar textbooks

Similar questions

How many Btu/h would be produced in a 12-kW electricheater?
Figure 1 shows a piston-cylinder assembly containing gas, on top of a hot plate. At the beginning, the system is at room temperature, and the piston seats on the set of stops. Then, the heating plate is turned on and eventually the piston starts to rise. Determine at which pressure this happens, considering that g = 9.81 m/s 2.
Prove that internal energy is the property of the system.
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz⁢= 5 m higher than the pump, where m˙=50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. Determine:(a) the magnitude of the pump power, in kW.(b) the mass flow rate of steam, in kg/s, that flows through the turbine.
Four bodies are located in a region where g=9.67 m/s2 = 31.7148 ft/s2 Body1=750gm; Body2=4 slugs; Body3=4.5N and Body4=32.2 lbf (2.2lbm=1kgm, 1slugm=32.2lbm) a. What is the total mass expressed in lbm?
Given the lifting table shown below, The diameter of the plunger DP 20 cm. The ram diameter DR 60 cm , The efficiency is 100 %, The stroke of the plunger is 30 cm. The ram has to raise a load F2 = 20 kN. Find: a) The force F1 exerted on the plunger b) the number of strokes needed to raise the load given above by a distance of 10 cm . c) the volume of oil pumped if the load moves by 30 cm (using plunger force given in a ) d) What will be the new diameter of the ram piston if the new load force is 16 times the force exerted in the plunger the diameter of the plunger is kept to 20cm. (please check the picture carefully).
8: The kinetic energy E of a body is proportional to its weight W and the square of its velocity v. A 10 lb body moving at 6 ft/sec has an 8 ft – lb of kinetic energy. How much is the kinetic energy of a 2 ton ( 4,000 lb ) truck speeding at 45 kph ( 66 ft/sec )?. Select one: a. 268,400 ft – lb b. 325,500 ft – lb c. 387,200 ft – lb d. 258,900 ft - lb
The torque (in N-m) exerted on the crank shaft of a two stroke engine can be described as T = 10000 1000 sin2θ − 1200 cos 2θ , where θ is the crank angle as measured from inner dead center position. Assuming the resisting torque to be constant, the power (in kW) developed by the engine at 100 rpm is_____
Which of the following is intensive property heat: work, internal energy, specific heat, heat capacity, pressure
3. The movement of a piston in a cylinder is restrained by a spring with a spring constant K=250lbf/in. At a position of x=0 the force exerted by the spring on the piston is 0lbf. How much work is done (in Btu) on the spring by the piston when the piston has moved 2in (compressed the spring 2in)? a.Sketch the problem. b.Draw lines identifying the control volume, or control mass. c.Identify the states with numbers, letters, or descriptions such as “in” and “out”. d.Write down the knowns and unknowns. e.Identify what is being asked for f.State all assumptions.
In a four wheeler, the heat energy is converted into ___________ A. kinetic energy B. work energy C. potential energy D. datum energy
I want this question required A)The inlet air temperature in K is: B) The net linear momentum in kN is: C)The exhaust gas density in kg/m^3 is: D)The reaction force F_R in kN is: E)The inlet mass flow rate in kg/s is: F)The linear momentum at the exhaust in kN is: G)The exhaust area in m^2 is: H)The exhaust gas density in kg/m^3 is: I)The exhaust mass flow rate in kg/s is: J) The exhaust area in m^2 is: