Chapter 5, Problem 5.77P

body (mass 800 g) changes velocity from 25 m/sec to 40 m/sec, find the kinetic energy?

thermodynamics problem

5. a) Using the Euler whirl equation, find the power transfer between a throughput of 100kg/s of air and a rotor where impeller speed in constant at 300m/s and the change in whirl velocity of the air is 150m/s. b) If this impeller is a compressor, producing isentropic compression, find the exit pressure and temperature of air taken in at sea level standard conditions.

The pressure inside a diesel engine cylinder is 20 kPa, find the work done if the volume changes from 3.5 m3 to 5.0 m3.

3.16 The store advertisement claims that a new light bulb type consumes only 9 W to generate the same visible light as an old 40-W light bulb. The advertised saving in electric power consumption is 31 W. The objec- tive of this problem is to question this advertisement. Assume that the light bulb is on inside a building of temperature Tg = 20°C, while the 35°C. A heat pump removes the heat atmospheric temperature is TA current generated by the light bulb (Q) and rejects it to the ambient. The heat pump power required to do this is WHp. The Q/WHP ratio of the heat pump is one-fifth of what it would be in the limit of reversible operation. (a) Determine the Q/WHp ratio in the reversible limit and in the actual heat pump design. (b) Calculate the heat pump power WHp required to evacuate Q from the old light bulb and the new light bulb. (c) Calculate and compare the total power dissipated because of the old light bulb and the new light bulb. The total power of one light bulb is the sum of…

In a turbine, steam enters with an enthalpy of 1275 Btu/lb, and leaves with an enthalpy of 1115 Btu/lbm. The transferred heat is 13 Btu/ibm. Find the turbine work in hp where the steam flow rate is 5 lbm/sec?

Find kinetic energy

A steam engine has a boiler that operates at 500 K. The energy from the boiler changes water to steam, which drives the piston. The temperature of the exhaust is that of the outside air,  250 K. If the  3500 J of energy is supplied from the boiler, find the energy transferred to the cold reservoir and the work done by the engine on its environment.

4.28 A wind turbine can extract at most a fraction 16/27 of the wind kinetic energy. With a rotor diameter of 15 m and a wind speed of 5 m/s find the mass flow rate and the power generation. You need to assume something.