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A vapor-compression cycle refrigerator using R-22 as the working fluid has an evaporator temperature of -30.0°C and a condenser temperature of 50.0°C.
The refrigerant enters the compressor at 7.50 kg/min as a saturated vapor and exits the condenser as a saturated liquid. The isentropic efficiency of the compressor is 82.5%. Determine
a. The coefficient of performance for the system.
b. The coefficient of performance for a reversed Carnot cycle with the same temperature limits.
c. The refrigeration (in tons) that this system can provide.
A 31.0 kg child runs with a speed of 3.00 m/s tangential to the rim of a stationary merry-go-round. Calculate the initial kinetic energy of the system
A 700-N force P is applied at point A of a structural member. Replace P with
A train is travelling up a 5 degree incline at a speed of 2.2 m/s while the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did last car travel before mom..
A disk 8.00 cm in radius rotates at a constant rate of 1,200 rev/min about its central axis. Determine its angular speed in radians/sec
Curious about the resistance of an audio speaker, Luke Klaus Lee measures the resistance of a speaker which is labeled as having a6 Ω impedance. The voltmeter’s lowest scale is 200Ω and only gives one digit. What is the range of frequencies involved?
A monatomic ideal gas expands on a linear process such that P=3V + P1 ( initial pressure.) P1 and V1 are the initial pressure and initial volume
An explorer is caught in a whiteout (in which the snowfall is thus thick that the ground cannot be distinguished from the sky) while returning to base camp. Find how far must he now travel to reach base camp
The support assembly shown is bolted in place at B, C, and D and supports a downward force P at A. Knowing that the forces in members AB, AC, and AD are directed along the respective members and that P = 45 lb, determine the forces in the members.
Lasers are used extensively in eye surgery to remove unwanted "material" from the eye or reshape the eye's lens. What is the power during one of these pulses
Imagine a perfectly elastic collision between to masses. Mass m1 is moving horizontally to the right at v0 towards mass m2. Calculate the recoil angle of m2 and the recoil speed of m2
A 3500kg car traveling to the north isslowed down uniformly from an initial velocity of 20m.s by a 6250Nbraking force acting opposite the car's motion. How long does it take the car to come to a complete stop
a ball thrown straight upward returns to its original level in 2.60 s. a second ball is thrown at an angle of 32.0deg
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