Spherical Mirrors: If you stand in front of a convex mirror, at the same distance from it as its focal length,
A. you won't see your image because there is none.
B. you won't see your image because it is focused at infinity.
C. you will see your image and you will appear smaller than you.
D. you will see your image and you will appear larger than you.
E. you will see your image and it will be the same size as you except upside down.
Answer: C
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What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. B) The atmosphere is too cold and thin for abundant liquid water today, yet we see evidence of large areas of flowing water in the past. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tells us that Mars must once have been much warmer.
What would be the most significant change in the plot if the planet were more massive?
A) It would not change, because it describes the motion of the star, not the planet. B) The peaks and valleys would get larger (greater positive and negative velocities) because of larger gravitational tugs. C) The peaks and valleys would get closer together (shorter period) because of larger gravitational tugs.
Sound waves in air are transverse waves
Indicate whether the statement is true or false
An ideal spring has a spring constant (force constant) of 60 N/m. How much energy does it store when it is stretched by 1.0 cm?
A) 0.30 J B) 60 J C) 0.0030 J D) 600 J