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An air conditioner operating between 97F and 72F is rated at 3900 Btu/h cooling capacity. Its coefficient of performance is 27% of that of a Carnot refrigerator operating between the same two temperatures. What horsepower is required of the air conditioner motor?
An electric eld of magnitude 3.5 kN/C is applied along the x axis. Calculate the electric flux through a rectangular plane 0.35 m wide and 0.7 m
Many chemical reactions release energy. Suppose that at the beginning of a reaction, How much electric potential energy was lost in this reaction (in units of eV)
What is the acceleration of a car that moves at a steady velocity of 100 km/h for 100 second? Explain your answer and state why this question is an exercise in careful reading as well as in physics.
Calculate the period of a satellite orbiting the Moon, 130km above the Moon's surface. Ignore effects of the Earth
If the hypotenuse of a right triangle is 6.00cm long, and the opposite is 4.00. What is the angle facing the opposite
A sinusoidal transverse wave traveling in the positive direction of an x axis has an amplitude of 1.0 cm, a wavelength of 22 cm, find the speed of the wave
While surveying a cave, a spelunker follows a passage 190{\rm m} straight west, find the magnitude and direction of the fourth displacement
Consider a sunspot with measured field strength 1000 Gauss. Assume the ratio of the total brightness of the gas at the center of the sunspot, Determine the temperature of the gas inside and outside the sunspot
plan a picutre showing Mary's displacment due to rowing, her displacemnet due to the river's motion, and her net displacement.
Red light of wavelength 633nm from a helium-neon laser passes through a slit 0.370mm wide. What is the width of the central bright fringe
A ballplayer catches a ball 2.75 seconds after throwing it vertically upward. With what speed did he throw it? Calculate the final & resultant velocity and acceleration.
A 33.0 g bullet moving at 434 m/s strikes a 5.0 kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 295 m/s. How fast is the bag moving while the bullet exits.
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