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A light globe dissipates 200W as heat. It is exposed to a light breeze of air at 20C, which results in a convective heat transfer coecient of 5(W/(m^2*K)).
In each case, calculate the Biot number for the object and indicate whether or not the lumped approximation is valid.
The system undergoes a polytropic process with pV1.2 = const. to a final pressure of 150 kPa. Determine the specific work required to go from the initial state to the final state. What phase is the
Find the pressure inside the cylinder due to the piston and the ambient air. Find the energy transfer from the system by work
Determine the amount of CO2 emission per year that is saved by the use of the wind turbines for replacement of coal-fired power plants.
An oven has five radiant heaters; each one is rated at 15 kW. It should heat some 2-kg steel plates from 20 degrees CELCIUS to 800 KELVIN. How many of these plates per minute can it heat?
At resonance the amplitude is measured to be 0.58 cm. At 0.80 resonant frequency, the amplitude is measured to be 0.46 cm. Determine the damping factor of the system.
Determine the phase or phases in a system consisting of H2O at the following conditions, sketch p-v and T-v diagrams showing the location of each state and determine the specified property at at the
Was this person napping in the nut pile the day God was cracking nuts? Evaluate this suggestion, assuming the copper surface temperature is 150'C, the rubber is 5-mm thick.
For each sketch, keep the direction vector within one unit cell, using the fact that the direction does not change when all vector coordinates are multiplied or divided by the same factor.
Determine the time needed for the rod temperature to experience 95% of its maximum temperature change. Neglect change in the dimensions of the SMA rod when calculating thermal response of rod.
The pressure ratio is 6, and air leaves the combustion chamber at 1100 K. Determine the cycle thermal efficiency if an ideal regenerator is employed
List the compressibility factors for Air, Nitrogen, Oxygen, Carbon dioxide, Argon, and water at 300 K and 100 kPa. Also, list beside each species whether they can be assumed to be an ideal gas at t
What is the work required using the saturated liquid approximation? What is the work required using the compressed liquid tables? What is the work required if you use the mechanical energy equation?
Can the final equilibrium state be determined? How many independent properties are needed to fix a state? What is the first law for the process described above?
The tank is allowed to exchange heat with the surroundings to maintain its temperature at all times. What kind of a process is this? What is the pressure remaining in the tank?
Show the state on a T- v diagram with the vapor dome and a constant pressure line passing through the state. Then determine the requested properties using the steam tables.
A levitation fan has been selected that delivers this pressure at a flowrate of 0.032 m3/s. What is the resulting gap height (in mm)? Assume the density of air is 1.19 kg/m3.
A water pump pumps out 2400kg of water pr min. (A) if water coming out with a velocity of 3m/s, what is power of the pump? (b) how much work is done if the pump runs for 10 hours?
Assume the only thermal interaction is conduction between the masses along the bar. How long does it take for the masses to equilibrate to within 5 degrees celcious of each other?
Determine the power (kW) required to run the compressor. Calculate the power (kW) required for isentropic compression from the same inlet state to the same final pressure in a single stage.
Draw the system with any indicated work and heat transfer and choose a system boundary that only contains the water. If present, make sure you indicate the direction of the work and heat transfer.
What is the frequency of the motion? What is the amplitude? What is the total mechanical energy of the motion?
Find the isentropic and the second law efficiencies for a turbine. It receives steam at 3000 KPa, 500c and has two exit flows, one at 1000 kPa.