If a car engine has a thermal efficiency of 50% and it does 500 J of work in one cycle, how much energy input does it require each cycle?
1.250 J
2.500 J
3.750 J
4.1000 J
4
Physics & Space Science
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An object transfers heat when its temperature is lowered by contact with
Physics & Space Science
A metallic surface is illuminated with light of wavelength 400 nm
If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Physics & Space Science
Where are the greatest sources of error in this experiment?
Physics & Space Science
In present day technology, a substance can become a superconductor
A. only at absolute zero temperature. B. at room temperature. C. at a temperature above the boiling point of water. D. at temperatures above 0 Kelvin but less than 100 Kelvin.
Physics & Space Science