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A vapor-compression refrigeration unit uses R-22 and has an isentropic efficiency of 88.0% when working between the temperature limits of -20.0°F and 80.0°F.
The refrigerant enters the condenser as a saturated vapor and exits as a saturated liquid. Determine the coefficient of performance (COP) of this unit.
A spacecraft that moves away from the earth with a speed of 0.800c and fires a space probe in the direction of its movement with a speed of 0.650c. What is the velocity of the probe relative to the earth?
A large tank is filled with methane gas at a concentration of 0.690 kg/m3. What is the cross-sectional area of the pipe
The spacing between two closely spaced oppositely charged parallel plates is decreased. Explain what happens to the electrostatic potential difference between the plates
Julie drives 100 mi to grandmother's house. On the way, Julie drives half the distance at 40 mph, How long does the return trip take
How long after being thrown will the balls collide
On his honeymoon, James Joule attempted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. Find what maximum temperature rise
question a 140g arrow is shot vertically from a bow whose effective spring constant is 500 nm. if the bow is drawn 60cm
Suppose a 7.1 eV electron and a 9.77 eV positron collide, Find the frequency of these new photons
A rifle fires a bullet of mass 0.0350 kg which leaves the barrel with a positive velocity of 304 m/s. At what velocity does the rifle recoil
1. Determine the magnitude and direction of the electric field at a point midway between a -6.μC and a +4.5 μC charge at 8.0 cm apart. Assume no other charges are nearby.
A 65-kg bicyclist rides his 8.8-kg bicycle with a speed of 14 m/s. What is the magnitude of the braking force? How far does the bicycle travel if it takes 4.0 s to come to rest?
Two point charges Q1 = +1.8 C and Q2 = +4.0 C are initially separated by 1.0 m and held fixed. What is the sum of the kinetic energies of the two particles when they are very far apart
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