Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
The rotor starts at t = 0 with no initial velocity; after 2.5 sec, the rotor has completed 5 revolutions. Write the equations of motion for the rotor and determine the angular velcity at t = 2.5sec.
If the wind blows across the wire with a velocity of 25 km/hr, determine the surface temperature. The ambient temperature is 22 degree C.
Calculate the final velocity. Assume that the specific heat at constant volume is 10.0 kJ/kg.K and that the inlet velocity is negligible.
For this gas in the temperature range involved, Cp = 0.84 +0.00075T, where T is in Kelvins and Cp is in kJ/kg. K. Calculate: - the enthalpy change of the gas - the work done on the gas.
Sketch the cycle on a T-s diagram and compute the fraction of steam that is extracted from the turbine at 5 bars, for the feed water heater.
The turbine exhaust pressure is 0.1 bar. The turbine is adiabatic with an isentropic efficiency of 82% and the pump has an efficiency of 78%. Determine the thermal efficiency of the cycle.
The turbine inlet is 140 C and the mass flow rate is 1200 kg/hr. Determine: a. the net work in kJ/kg. b. the thermal efficiency. c. the area of the solar collectors (in m2) if the collector picks up
Find the work output of the heat engine, the efficiency of the heat engine, the temperature of the low temperature reservoir for the refrigerator, in degrees Celsius, and the COP of the refrigerator
If an actual heat pump requires 10 kW of power input for the same temperatures and same heat supplied from -7 degree C, determine the actual COP and the actual heat rejected to the 29 degree C reser
The tested centrifugal pumps are being considered to pump water from reservoir to the tank. Estimate how long will it take to fill the tank: (a) using the parallel configuration, (b) using the serie
Estimate the shaft power required to pump the water at these conditions. Neglect all friction and heat-transfer. Assume temperature of water at he exit is 300K.
Determine the configuration of a heat exchanger to accomplish these needs. Use a water velocity of 1 ft./sec and in your calculations show at least two design solutions.
If using the similitude assumption (e.g., keeping Re the same), what is the required length of the wind tunnel model if test speed is 80 m/sec?
Determine the thermal efficiency of this cycle. Repeat the problem assuming the isentropic efficiency of the turbine is 87% and the isentropic efficiency of the pump is 85%.
If the mass center of the body is displaced 3 cm to the left of its equilibrium position and released from rest, describe the motion as a function of time.
Determine the coefficient of performance of the refrigerator and compare with the COP of a reversible refrigerator operating between the same reservoirs.
Determine the radiosity at the top plate surface, the net radiation heat flux at the top surface, and the rate at which the temperature of the plate is changing with time.
There is no significant heat transfer between the engine and its surroundings, and kinetic and potential energy effects are negligible. For operation at steady state, determine the maximum rate that
At the exit, the pressure is 0.1 bar, the quality is 0.9 and the velocity is 50 m/s. Calculate the rate of heat transfer between the turbine and its surroundings.
Determine the thermal efficiency of this power plant. The thermal efficiency of stem is superheated at 600°C instead of 350°C
Estimate the torsional load at which the cylinder will fail. Draw a differential element in cylindrical coordinates and indicate the plane on which the failure would initiate.
The combined mass of the toboggan and riders is 110 kg, and the slope of the hill is 20°. Calculate the average friction force between the toboggan and the snow and the corresponding coefficient
At what wind tunnel speed should the wind tunnel be run in order to acheive dynamic similarity? Estimate the aerodynamic drag of the model parachute in the wind tunnel?
Some steam leaves the turbine at a pressure of 1 MPa and enters the open feedwater heater. Determine the fraction of steam extracted from the turbine and the thermal efficiency of the cycle.