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The 50-mm radius pulley A of the clothes dryer rotates with an angular acceleration of alpha = 24*(theta)^(1/2) rad/s^2, where theta is in radians. Determine its angular acceleration when t = 2s, s
Determine the horsepower input for a motor necessary to lift a 200 kg box at a constant rate of 2 m/s. The overall efficiency of the system is 0.8.
A steam turbine produces 3000 hp with a mass flow rate of 22,000 pounds per hour. The steam enters at 1100 °F and 900 psi and exits at 2.5 psi.
What is the temperature at the exit of the valve in oC? what is the internal energy (kJ/kg) of the refrigerant at the exit of the valve?
An insulated,thin walled pipe of 100mm diameter is used to transport water to equipment that operates outdoors and uses the water as a coolant.
Assume the density of air is 1.16 kg/m3, and neglect the weight of the ropes and the cage. (b) Also, determine the maximum amount of load, in kg, the balloon can carry.
A single degree of freedom system has a concentrated mass weighing 38.6 lb, a spring constant of 22.5 lb/in and a damping coefficient of .6 lb-sec/in.
What is the thermal resistance associated with a wall that is 2.5m high by 6.5m wide ( having 10 studs, each 2.5m high)? assume surfaces parallel to the x-direstion are adiabatic.
Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first starts moving, and (c) the work done during this process. Also, (d) show the process on a P-v dia
Based on inernal energy considerations, what dislocation density in Cu is needed to make the crystalline form of Cu unstable with respect to the liquid form? What would be dislocation spacing be at
Cold water (c_p = 4.18 kJ/kg*C) leading to a shower enters a well-insulated, thin walled, double-pipe, counter-flow heat exchanger at 10 C at a rate of 0.95 kg/s and is heated to 70 C by hot water (
The energy generated within the house from people, lights, and appliances amounts to 4,500 kJ/h. For a COP of 2.5, determine the power input to the heat pump in kW.
If the plant uses 28.7 kg/s of coal as its fuel and coal has a nominal heating value of 32,000 kJ/kg, what is the overall efficiency of the plant (in percent)?
A bar of high strength aluminum alloy is 150 mm long and has a circular cross section of diameter 40mm. It is subjected to a tensile load of 250kN, which gives a stress well below the material's yie
Steam enters an adiabatic turbine at 3 MPa and 350 celsius and leaves the turbine at 75 kPa with a quality of 89%. IF you can neglect the potential energy effects, the inlet velocity is 100 m/sec an
How much is the mass rate for the outlet gases that is needed to get an initial acceleration of one standard gravity, i.e., 9.8 m/s2?
Calculate the rate of heat removal (kW) required using the heat capacities from Transport Processes and Unit Operations 3rd Ed. by Geankoplis (reproduced in the class notes).
Predict the boiling heat-transfer coefficient for water under pressure boiling at 250 degrees F for a horizontal surface of 1/16 inch thick stainless steel having a k of 9.4 btu/h ft F.
A long spring with a K=50 lb/in is cut into three equal parts. The resulting springs are connected to a 386 lb block as shown in figure. Determine the natural frequency of this system. Assume negli
One of the problems of wind tunnel testing at airspeeds near sonic speed is the large effect on the flow conditions of a small change in the test configuration. Suppose sonic velocity in a wind tunn
A mass of 10-g of nitrogen is contained in a spring loaded piston cylinder. The spring constant is 1 kN/m and the piston diameter is 10 cm. When the spring exerts no force against the piston, the ni
If the roller at B can sustain a maximum load of 3 kN, determine the largest magnitude of each of the three forces F that can be supported by the truss.
What is the change in entropy of the water going from state 1 to state 2? If the surroundings are treated as a thermal reservoir, what is the total change in entropy of the universe due to this cool
A well-insulated turbine operating at steady state develops 28.75 MW of power for a steam flow rate of 50 kg/s. The steam enters at 25 bar with a velocity of 61 m/s and exits as saturated vapor at 0