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Determine (a) the coefficient of performance and (b) the heat supplied at 29 degree C, in kJ/s. (c) If an actual heat pump requires 10 kW of power input for the same temperatures and same heat suppl
The horizontal force moves the 3 kg package up a smooth hill whose profile is given by y = x2/4, where x and y are in meters. Determine the velocity vector of the package in Cartesian coordinates whe
The valve is opened and the two quantities of air are allowed to mix until equilibrium is attained. employing the ideal gas model with cv= 0.18 Btu/lb *R Determine the final temperature, in F.
Express this compressor work rate in kilowatts and calculate the cost per 24.0 hour day if electricity is purchased at 10.0 cents/(kW * hour).
Steam is now compressed in a reversible manner to a pressure of 1 MPa. Determine the work done on the steam during the compression.
A refrigerator freezer compartment is maintained at a temperature of -15°F by removing heat at a rate of 4500 Btu/hr. Calculate the rate of heat transfer (Btu/hr) from the refrigerant to the room.
Using the Kelvin-Planck statement of the second law of thermodynamics, demonstrate the following corollary. The coefficient of performance of an irreversible refrigeration cycle is always less that
To what depth should the tubing be buried so that the soil can be viewed as an infinite medium at constant temperature over a 12-month period?
Assume a weight of 164 lb for the bike and rider. What was the average power output used for this ride? Specify your answer in horsepower to 3 decimal places.
Find the minimum release height so that the car successfully goes all the way through the loop. Find the force exerted by the car on the track when it is a quarter of the way in the loop.
If an automobile of mass 2 Mg rounds this curve at 100 km/h, what is the minimum coecient of friction between tires and road so the automobile will not skid.
Determine the final velocity of each car, after all impacts, assuming (a) cars A and C hit car B at the same time, (b) car A hits car B before car C does.
Determine the change in specific entropy between states 1 and 2 of the fluids given below: R-134a. State 1: T1=0C, p1= 4.1 bar , State 2: T2 = 20C, p2= 4.0 bar.
Heat is transferred to the steam until the temperature is 300C, while the pressure remains constant. Determine the heat transfer and the work for this process.
Calculate the preload needed in the belt if a power of 7 kW should be transmitted at 1000 rpm by using only one-half the wrap angle on each pulley.
Calculate the thermal efficiency based on the net work and the heat addition. (Check to make sure that it matches the Carnot efficiency)
Calculate the material removal rate and the cutting time, and estimate the power required. Assume specific cutting energy to be 3.4 hp-min/in^3.
A first-order system with a time constant equal to 10 ms is subjected to a sinusoidal forcing with an input amplitude equal to 8 V. Determine the magnitude ratio for the 100 rad/s forcing case.
Neglecting KE and PE changes and assuming ideal gas behavior, find whether the expansion is internally reversible, irreversible or impossible.
How long will it take to drain the tank completely if it is full initally? Assume the velocity of the water at the tank surface is negligible compared to the velocity through the pipe.
A dredger is pulling sand from the bottom of a harbor and loading it onto a barge. What is the tension on the mooring line that connects the barge to the dredger during these loading conditions?
If it takes 6 seconds for the belt to go from zero to the speed of 3ft/s, calculate the final angular speed of the drum and it's angular acceleration. Assume constant acceleration.
An insulated piston-cylinder device contains 5 L of saturated liquid water at a pressure of 200 kPa. Determine the total entropy change of the water during this process in kJ/K.
Calculate the relative amount of iodine-132 (a/a0) in a patient's body 48 hours after receiving a dose. After determining the value of k, define a vector t= 0, 4, 8, ..48 and calculate the correspon
Estimate the pressure exerted against a sand below the bottom of the surface casing at a depth of 5,500 ft. Assume ideal gas behavior.