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 [ Return to question menu ] Answer 1 1/2D CORRECT This answer is correct, because you have to use the equation F = Gm1m2 / r^{2} 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 / r^{2}, 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 / r^{2}, 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 / r^{2}, 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 / r^{2}) to use and how the force is affected by the number in (r) in the equatiion. return to top |
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