A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down.
b. down and inwards.
c. down and outwards.
d. down and backwards.
e. down, inwards and backwards.
c
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Briefly describe Mars's surface
What will be an ideal response?
Saturn's atmosphere
a. has more distinctive zones and belts than Jupiter's. b. is rich in free oxygen. c. is hazy above the clouds. d. has more distinctive zones and belts than Jupiter's, is rich in free oxygen, and is hazy above the clouds. e. does not have more distinctive zones and belts than Jupiter's, is not rich in free oxygen, and is not hazy above the clouds.
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) The light that they emit is so weak that it is undetectable to our telescopes. B) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. C) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. D) They interact with other matter only through the weak force and not through gravity or any other force.
The sun radiates at a power of
How long does it take for the sun to lose an amount of mass equal to the mass of the Earth 
Choose the first answer that is correct.
A. less than one year
B. less than 1000 years
C. 
D. 
E. 