Why is atmospheric pressure less on top of a mountain than at sea level?
a. It is cooler in the mountains.
b. Denser air sinks to sea level; the air on mountains is lighter.
c. The pressure at every height in the atmosphere is due to the weight of the air above it.
d. None of the above.
Answer : c. The pressure at every height in the atmosphere is due to the weight of the air above it.
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Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). How far away are the nearest stars (the three stars of Alpha Centauri)?
A) 2.5 miles B) 2,500 miles C) 250 miles D) the length of a football field E) 25,000 miles
If Jupiter were about 80 times more massive than it is, nuclear fusion should have been possible, making it a small star. What might have been the most likely effect on the Earth?
A) The gravitational pull might have prevented the Earth settling into a stable orbit, which would have prevented the development of life on Earth. B) Jupiter's moons would have been likely to develop life, which would have competed with life on Earth. C) The extra radiation from a second star in the solar system would have prevented life forming on Earth. D) Jupiter's magnetic field would have been much larger, disrupting Earth's magnetic field. E) Nothing because Jupiter is so much further from the Earth than the Sun is.
Doppler Effect: A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequency of 827 Hz between the sound it emits and the echo bouncing from the wall. What is the speed of the bat if the speed of sound in air is 343 m/s?
A. 2.7 m/s B. 3.0 m/s C. 3.6 m/s D. 5.4 m/s E. 9.0 m/s
Explain how gravity is used to explain the presence of the tides we experience on Earth
What will be an ideal response?