How and why would the noon Sun appear different to an observer on Mercury compared to one on Earth?
What will be an ideal response?
Mercury's rotation axis is almost perpendicular to its orbit. This means the angle of the Sun with the southern (or northern) horizon never changes. On Mercury, an observer at the equator would always see the noon Sun overhead, an observer at the pole would always see it on the horizon. On Earth, the altitude of the Sun changes over the year because of the 23.5 degree axial tilt.
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Carnot Engine: An ideal Carnot engine extracts 529 J of heat from a high-temperature reservoir during each cycle, and rejects 225 J of heat to a low-temperature reservoir during the same cycle. What is the efficiency of the engine?
A. 0.57 B. 1.35 C. 2.35 D. 0.7
The diameter of a typical atom is about ________ the diameter of its nucleus.
A) the same as B) 10 times C) 100 times D) 1/10 of E) 100,000 times
Mars probably has a large solid core surrounded by a thin shell of liquid core material in which the _______________ is unable to generate a magnetic field
Fill in the blank(s) with correct word
Astronomers who subscribe to the Big Bang theory believe the Big Bang occurred
A) about 14 billion years ago. B) at the beginning of time. C) both of these D) neither of these