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A heat engine exhausts its heat at 330 µC and has a Carnot efficiency of 38 percent. Find what exhaust temperature would enable it to achieve a Carnot efficiency of 42 percent?
you make a capacitor by cutting the 12.5-cm-diameter bottoms out of two aluminum pie plates separating them by 3.50mm
In reaching her destination, a backpackerwalks with an average velocoity of 1.34 m/s. How far east did she walk
A 20-kg object on a frictionless horizontal surface oscillating on a spring that has a force constant equal to 3.5 kN/m has a total mechanical energy of 0.60 J. (a) What is the amplitude of the motion?
A series RLC circuit contains a 2200 ohm resistor, a 14.0 nF capacitor, and a 0.0300 H inductor. what is the ratio of the charge to its initial value
When the lights of a car are switched on, an ammeter in series with them reads 7.52 A and a voltmeter connected across them reads 12.0 V, find the current through the starting motor
A supertrain of proper length 97 m travels at a speed of 0.91c as it passes through a tunnel having proper length 50 m. As seen by a trackside observer, is the train ever completely within the tunnel? Yes No If so, how much room does it have to spare..
Out of a gamma, beta, and an alpha source, what would be the best way to minimize radiation exposure given the following? Which one would you place in your mouth?
A 58 kg gymnast does a vault. He is traveling at 5.6 m/s just before he lands. He comes to a stop in 0.08 s. What is the average net force acting on him during this time
In a certain radio wave, the shortest distance between positions where the electric and magnetic fields are zero is 0.98 m. Determine the frequency of this radio wave.
A person blows into a rubber tube connected to one arm of a manometer containing glycerin of relative density 1.260. what is the gauge pressure of the air in the person's lungs
Richard is driving home to visit his parents. 140 of the trip are on the interstate highway where the speed limit is 65. How many minutes does he save
At one instant, a 19.0-kg sled is moving over a horizontal surface of snow at 5.00 m/s. find the magnitude of the average friction force acting on the sled while it was moving
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