The ideal efficiency for a heat engine operating between the temperatures of 227°C and 27°C is
A) 20%.
B) 25%.
C) 40%.
D) 88%.
E) none of the above
Answer: C
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Which of the following statements is not true about the sky at Earth's equator?
A) The Sun will pass directly overhead around noon each day. B) Over the course of the year, all 88 constellations will at some point be visible in the evening sky. C) There are no circumpolar stars in the equatorial sky. D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
Explain under what conditions you would use percentage error and when you would use percentage difference. Why would you sometimes use both?
A certain nucleus containing 8 protons and 7 neutrons has a radius R. Which of the following values would be closest to the expected value of the radius of a nucleus having 51 protons and 69 neutrons?
A) 1.85R B) 2.00R C) 2.14R D) 6.38R E) 8.00R
Estimate the rotational energy (in eV) for a diatomic hydrogen molecule in the L = 2 quantum state. (The equilibrium separation for the H2 molecule is 0.075 nm.)
A) 0.011 eV B) 0.022 eV C) 0.033 eV D) 0.044 eV E) 0.055 eV