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An inventor claims to have developed a food freezer that at a steady state requires a power input of .5 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K.
Water at 3 MPa and 160°C is produced from water at 2.5 MPa and 40°C in an irreversible process. The mass of the water is 5.6 kg. Find the entropy change of the process (kJ/K).
If the compressor consumes 1.2 kW off power, determine the COP of the heat pump and the rate of heat absorption from the outside air. Show work.
The waste heat from this engine is rejected to a nearby lake at 60 degrees F at a rate 800 Btu/min. Determine A] the power output of the engine and B] the temperature of the source.
What nominal annual rate of return would you receive if you purchased the bond now and held it to maturity 20 years from now?
When the conveyor was installed it was determined through safety checks that at an angle of 30 degrees the crate would begin to slip down the slope. Calculate the length of the conveyor belt.
Determine the angular acceleration and angular velocity of link AB at this instant. The upward motion of the guide is in the negative y direction.
Find the strain in the tendons. How does it compare to the ultimate percent elongation (UPE) for tendons? (b) Relate f to Y for the tendon.
If the reaction of the concrete on the post can be approximated by the distributed loading shown, determine the intensity of w1 and w2 so that the resultant force and couple moment on the post due t
Calculate the final temperature and net work per kg. If a diatomic gas had been used instead of helium, would the final temperature be higher or lower?
A machine cost $40000 to purchase and $10000 per year to operate. the machine has no salvage value, and a 10 year life. If i- 10% per year compounded annually what is the present worth?
What series of equal payments is economically equivalent to what present sum, if the quarterly payments are invested at annual rate of 8%, compounded quarterly?
What is the overall shortening of S of the bar? If the compressive stress in the bar cannot exceed 48 MPa, what is the maximum permissible value of load P?
The radioisotope 224Ra decays by a emission primarily to the ground state of 220Rn (94% probability) and to the first excited state 0.241 MeV above the ground state (5.5% probability).
An air-water manometer is connected to a pitot-static tube used to measure air velocity. if the manometer deflects 2in., what is the velocity? assume T=60F and p=15 psia.
Determine the magnitude of the acceleration of the train engine moving with a constant speed of 40 ft/sec when it is at a point x=600 ft.
If kerosene at 68 degrees F is flowing and the deduction on a mercury-kerosene manometer connected to the pitot tube is 4 in., what is the velocity?
The electric field between the plates is increasing at the rate 1.1 106 V/(m · s). What is the magnetic field strength at the following distances from the axis.
Determine (a) the shortest distance in which the train can reach a speed of 72 km/h, (b) the corresponding constant rate of acceleration At.
What would be the actual velocity of the air at the exit with the results obtained above? If you were to use this exit velocity what result would you get for your temperature at the exit?
The flat plate has a uniform surface temperature of 35 deg C. If the friction force asserted of the flat plate is 0.1 N, determine the rate of heat transfer from the plate.
The specific heat of water is 4185 J/(kg K). After the heater is started, how long will it take the heater to raise the water temperature to 90 degrees C?
What is the final temperature of the air? if the heat is transferred during a constant pressure process, what is the final temperature of the air?
Characteristic length of L = 5m, is maintained at a surface temperature of Ts = 400K and is placed in atmospheric air at T1 = 300K, what will the value of the average convection coefficient be if th
If the face of the sign is subjected to a uniform pressure of a = 164 lb/ft2, determine the state of stress at points C and D. The sign has a width of 11.3 ft.