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A vapor-compression cycle heat pump using R-134a as the working fluid is to be designed for heating a house. The evaporator is to be buried in the ground below the frost line and consequently will remain at 14.0°C year-round. The condenser is to be inside a house and will operate at a constant 20.0°C. The refrigerant enters the condenser as a saturated vapor at 7.30 kg/min and exits as a saturated liquid. Assume the isentropic efficiency of the compressor is 91.0%. Determine
a. The coefficient of performance of this system.
b. The amount of heat (in kW) transferred into the house.
One end of a stretched ideal spring is attached to an airtrack and the other is attached to a glider with a mass of 0.360. Find the magnitude of the maximum acceleration of the glider
starting from rest, a 4.1 kg block slides 2.00 m down a rough 30 degree incline. The coefficient of kinetic friction between the block and the incline is uk= 0.436, determine the work done by the normal force
A large man sits on a four-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg. what pressure does each leg exert on the floor
a 100 sec long train (as measured at rest) moves in the x-direction with speed B=4/5. what is the position of the front of the train when the rear light is turned on, according to an observer on the ground
A point charge q1=15.00 µC is held fixed in space. What is the acceleration of the sphere at the instant when its speed is 23.0m/s
A capacitor has parallel plates of area 12cm^2separated by 2.5 mm. The space between the plates is filled with polystyrene (K=2.6,Em=2.0*10^7 V/m). Find the permittivity of polystyrene
Coherent light that contains two wavelengths, 660nm and 470nm , What is the distance on the screen between the first-order bright fringe for each wavelength
A double slit with d= 0.02 mm is illuminated by a blue laser at 450 nm and a red laser at 650 nm, what is the distance separating the blue and red fringe
A 0.55 kg- croquet ball is initially at rest on the grass. When the ball is struck by a mallet, the average force exerted on it is 200N. If the ball's speed after being struck is 3.5 m/s , how long was the mallet in contact with the ball?
a spherical non-conducting shell of inner radius r1 10 cm and outer radius r2 15 cm carries a total charge q 15 oc
a block of mass 12.0 kg is connected to a spring on a horizontal frictionless surface. write the expression for the position of the block as the function of time
An athlete swings a 4.50-kg ball horizontally on the end of a rope. The ball moves in a circle of radius 1.000 m at an angular speed of 0.540 rev/s. What is the tangential speed of the ball
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