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A cycle receives 500 Btu of heat at 1000°F and rejects 200 Btu of heat at 200°F. There is work input of 275 Btu and work output of 575 Btu.
a. What is the net work? Is it into or out of the cycle?
b. Compute the cycle efficiency.
c. Does this cycle violate the first or second law of thermodynamics? Is it reversible, irreversible, or impossible?
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (?196°C), What value of absolute zero does the calibration yield
A baloon 1.2 g when empty has volume 800 cm ^3 and is filled with helium. density of air is 1.29 kg/m^3 while that of helium is .179 kg/m, calculate acceleration of balloon
A cue ball m1 = 0.39 kg is shot at another billiards ball m2 = 0.59 kg which is at rest. The cue ball has an initial velocity of v =9.5 m/s. What is the cue balls final velocity in m/s
The wake of a speedboat is 17â?? in a lake where the speed of the water wave is 2.8km/h. What Is the speed of the boat
A helicopter is ascending vertically with the speed of 5.79. At a height of 127 above the Earth, a package is dropped from a window. How long take the package to hit the ground.
Dario, a prep cook at an Italian restaurant, spins a salad spinner and observes that it rotates 20.0 times in 5.00 seconds and then stops spinning it. What is the angular acceleration of the salad spinner
A 5 kg block is dragged on a horizontal surface in a circular path of radius 2 m. what is the work done by friction during one turn
A 78-kg man standing on a scale in an elevator notes that as elevator rises, the scale reads 834 N. What is the acceleration of the elevator.
A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, What was the bear's average speed
A car is traveling at 85.1 km/h at this speed the car has a fuel efficiency of 14.5 km/L. What is the average flow rate of gasoline
Consider a balloon containing nitrogen molecules at room temperature (20°C) and atmospheric pressure. what is the number of molecules in the balloon
Starting from rest, a hammer thrower performs 4 revolutions in 4 seconds before releasing the hammer. What is the centripetal acceleration needed to rotate the hammer
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