Aforce exerted on an object produces an acceleration. if the mass remains the same and the acceleration is doubled, the force must be quadrupled halved doubled jupiter's gravitational field at the surface is approximately three times that of the earth. a person weighing 120 lb. on the earth's surface would weigh how much on jupiter? weight does not change 360 40 planet a takes one year to go around the sun at a distance of one a u. (astronomical unit). planet b is three a.u. from the sun. how many years does planet b take to orbit? choose the closest answer. 3 years 5 years 7 years 9 years

A
The formula is F = m*a. It looks like a direct variation. m is held constant so as a increases, so does F. The answer is if a is doubled so is F.

Doubled <<<<< answer.

B
Jupiter has a gravitational pull 3 times that of earth. If a person weighs 120 pound on earth, he will weigh 3*120 = 360 on Jupiter. The answer is not 40, that's for sure.

360 pounds on Jupiter <<<<< answer.

C
In the solar system the time taken for Mercury to orbit the sun is 88 days. The earth takes 365 days. The distances are 58 million miles and 150 million miles. The distance is about 3 times as far for the earth as it is for Mercury. Though not a very close approximation the time's ratio is roughly 3 times as much, perhaps 4 but that is not an option. Pick 3.

A<<<< answer. 

D

Explanation:

Terminal Velocity is the maximum velocity (speed) attainable by an object as it falls through a fluid air.