Poke a pinhole in a piece of card and hold it in sunlight and an image of the Sun is cast on the floor. The Sun-image diameter depends on the height of the pinhole above the floor
Measurements for all heights show the Sun-image diameter is about 1/100 the distance between the pinhole and the floor. This means that
A) about 100 end-to-end Sun images would fit between the pinhole and the floor.
B) distance-wise, the Sun is about 100 Suns away from Earth.
C) both of these
D) none of the above
Answer: C
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Together which two gases make up 99% of Jupiter's atmosphere?
A) Ammonia and methane B) Water vapor and methane C) Helium and ammonia D) Hydrogen and ammonia E) Hydrogen and helium
The largest plutons are called ______________
Fill in the blank(s) with correct word
All real engines are less efficient than the Carnot engine because
a. they do not operate through the Otto cycle. b. they do not operate through a reversible cycle. c. the working substance does not maintain a constant volume through the cycle. d. the working substance does not maintain a constant pressure through the cycle. e. the working substance does not maintain a constant temperature through the cycle.