Two friction wheels A and B are both rotating freely at 300 rpm counterclockwise when they are brought into contact. After 12 s of slippage, during which time each wheel has a constant angular accel- eration, wheel B reaches a final angular velocity of 75 rpm coun- terclockwise. Determine (a) the angular acceleration of each wheel during the period of slippage, (b) the time at which the angular veloc- ity of wheel A is equal to zero.

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answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.