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Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in the figure concentrates sunlight on one side of a heat engine, producing a hot-reservoir temperature of 500 . The cold reservoir, ambient air, is approximately 30. The actual working efficiency of this device is 30%. What is the theoretical maximum efficiency?
You make a capacitor by cutting the 15.5 cm--diameter bottoms out of two aluminum pie plates, separating them by 3.40 mm, What's the capacitance of your capacitor
A motorcyclist is traveling along a road and accelerates for 6.98 s to pass another cyclist. What is the angular displacement of each wheel during this time
If it takes you about 2 minutes to fill your 12 gal (or 0.48 m3) gas tank. Estimate the velocity of the gas as it leaves the nozzle
You walk 1140 m east and then 860 m south in a total time of 16 min. Compute your average velocity for east and south
A rubber raft of mass 3M floats past a dock at 1 m/s toward the east. Find the final velocity of the raft and girl
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. calcultae the velocity of the target ball after the collision
Chip rolls a ball down an incline (without slipping) at the same time Emmanuel slides a frictionless block with the same mass down the incline
An engineer in a locomotive sees a car stuck on the track at a railroad crossing in front of the train. When the engineer first sees the car, the locomotive is 130 m from the crossing and its speed is 17 m/s.
a heat engine expels its waste at 300 C and has a carnot efficency of 25% without changing its intake temprature. What the temprature of the cold reservoir
A device uses a Stirling cycle on 433 moles of a monatomic ideal gas between two reservoirs with temperatures of 416 K, How much work is done by the device on the gas
What is the "Curie Temperature? Find the Curie temperature for iron, cobalt and nickel
A singly ionized 24Mg ion (mass 3.983 10-26 kg) is accelerated through a 2.8 kV potential difference and deflected in a magnetic field of 500 G in a mass spectrometer. Find the radius of curvature of the orbit for the ion
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