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An electric motor of mass 75 kg and speed 1200 rpm is mounted at the free end of a cantilevered steel beam of length 5 m, width 0.5 m and thickness of 0.1 m.
The ball of mass m is guided along the vertical circular path r = 2rc cos(theta) using the arm OA. If the arm has a constant angular velocity thetadot0 , determine the angle theta (less than or equa
A closed steel bottle contains carbon dioxide at -20C, x=20% and the volume is 0.05m^3. It has a safety valve that opens at a pressure of 6 MPa. By accident, the bottle is heated until the safety va
A boiler is designed to convert water at 1MPa, 50 degree C to a superheated vapor at 1MPa, 500 degree C (a) Determine the amount of heat transferred to water if the mass flow rate of water is 2 kg/
Water at 25 degrees C enters a heat exchanger at 0.1 kg/s and exits at 50 degrees C. Kerosene enters the other side of the exchanger at 100 degree C at a rate of 0.1L/s.
A steam turbine operating at steady state has water entering at 3MPa, 500 degrees C and velocity of 10m/s The water exits at 800 KPa, 250 degrees C and 100 m/s.
The average speed in the discharge pipe is 3 m/s. If the pump efficiency is 75 %, determine the power required to drive it.
A nitrogen line, 300 K and 0.5 Mpa, shown in the figure, is connected to a turbine that exhausts to a closed initially empty tank of 50m3. The turbine operates to a tank pressure of 0.5 Mpa, at whic
At a certain instant, a valve is opened and mass flows from the bottle at ?m/?t = 0.105 lbm/s. Find the rate of change of temperature in the bottle at this instant.
What are individual cutting tool with a number of cutting edges. they are useally held on the tool shank with various locking mechanisms?
The cylinder (with a friction-less piston of 2-kg mass and a radius of 5 cm) initially at 1 liter in volume and is filled with a given gas at 200 K and 105 Pa. It is perfectly heat insulated and is
The working fluid at 23 degrees C rejects 100 kJ/min as heat transfer from the engine. Determine the power output of the engine, in kilowatts.
A close rigid tanks with a volume of 2 m3 contain hydrogen gas initially at 320 K and 180 kPa. Heat transfer from a reservoir at 500 K takes place until the gas temperature reaches 400 K.
The COP of the refrigerator is 2.40, and the power input is 360 W. Find the time required, in minutes, to cool the water to 10 degrees C.
Steam enters a turbine at 120 bars and 440 0C and expands to 1 bar. At the exit entropy is 0.650 kJ/kg. K, greater than at the inlet. The process is adiabatic and change in kinetic and potential ene
The structure of a house is such that it loses heat at a rate of 4825 kJ/h per degree Celcius difference between the indoors and outdoors. A heat pump that requires a power input of 6.2 kW is used t
If the mass flow rate of steam is 50 kg/h, determine the rate at which heat is removed from the steam, in kJ/h. The rate of heat rejection to the cold reservoir, in kJ/h.
Is globalization a form of Western imperialism that may homogenize non-Western values? Why or why not? Can homogenization be avoided or mitigated?
Estimate the eutectic composition(%wt). Sketch the microsture during slow cooling of an alloy conataing 25%B from its liquid state to room temperature.
A rigid tank whose volume is 0.5 m3, initially containing ammonia at 20oC, 1.5 bar, is connected by a valve to a large supply line carrying ammonia at 12 bar, 60oC.
An 85kg man is riding a snowmobile at a constant speed of 80km/hr along a straight track near the South Pole . Explain why, although his speed is constant, the snowmobile has a non-zero acceleration
Saturated water vapor at 300 kPa undergoes an isothermal process in a closed system until it becomes a saturated liquid. How much heat transfer is required for this process?
A mixing chamber which is heated externally by hot air has two inlets and one exit. The water in each inlet and exit is at a pressure of 5 bar. Water enters through inlet 1 (d=6 cm) at 25oC with a m
The pump-turbine system draws water from the upper reservoir in the daytime to produce power for a city. At night, it pumps water from lower to upper reservoirs to restore the situation.
If a kitchen-sink water tap leaks one drop per second, how many gallons of water are wasted annually? what is the mass of the wasted water, in Ib? Asumme that there are 46,000 drops per gallon and