Physics Review Question

Unit: Mechanics
Year: 1990 Question#: 12
Question: Two point masses are located a distance, D apart. The gravitational force of attraction between them can be quadrupled by changing the distance to

(1 ) 1/2D
(2 ) 2D
(3 ) 1/4D
(4 ) 4D

What is this question really asking?




Explanation by: ALON B

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Answer 1
1/2D

CORRECT

This answer is correct, because you have to use the equation F = Gm1m2 / r2 and after pluging in 1/2 as (r) you will see that the force gets quadrupled. return to top























Answer 2
2D

INCORRECT

This answer is incorrect because after pluging in 2D for (r) into the equation F = Gm1m2 / r2, the force will be quartered and not quadrupled. return to top



























Answer 3
1/4D

INCORRECT

This answer would be incorrect becasuse after pluging in 1/4 for (r) into the equation F = Gm1m2 / r2, the force will have to be multiplied by sixteen. return to top


























Answer 4
4D

INCORRECT

This answer would be incorrect because after pluging in 4 for (r) in the equation
F = Gm1m2 / r2, the force be multiplied by 1/16. return to top


























What's this question really asking?

This qestion is testing to see if you know which formula (F = Gm1m2 / r2) to use and how the force is affected by the number in (r) in the equatiion. return to top

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