Of the following heat engines, which has the highest efficiency?
a. Hero's engine
c. a car's gasoline engine
b. a Carnot engine
d. a truck's diesel engine
B
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Dimensional Analysis: When dividing several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
Molecular Rotation: Estimate the maximum rotational energy (in electron-volts) for a free and freely-spinning diatomic hydrogen molecule in the L = 2 quantum state. The equilibrium separation for the atoms in the H2 molecule is 0.075 nm. (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s)
A. 0.011 eV B. 0.022 eV C. 0.033 eV D. 0.044 eV
On an H-R diagram, stellar radii
A) are greatest in the lower left and least in the upper right. B) decrease from left to right. C) are impossible to determine. D) increase diagonally from the lower left to the upper right.
Why is Hubble's Law called the top of the distance ladder?
What will be an ideal response?