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ipn [44]
3 years ago
11

9. To completely describe the motion of an object, you need

Physics
2 answers:
Aneli [31]3 years ago
8 0
D- all of the above
pav-90 [236]3 years ago
4 0
I think it’s D) all of the above
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A feather, a marble, and a cannonball are dropped from the same height at
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The correct answer is that they would all hit the ground at the same time. If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. This statement follows from the law of conservation of energy and has been demonstrated experimentally by dropping a feather and a lead ball in an airless tube.

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If the distance between two asteroids is halved, the gravitational force they exert on each other will
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Here we have to use Newton's gravitational law that relates the gravitational force between two objects with their masses (m_{1} & m_{2}) and the distance between them (r) in the next way:

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Now if distance between asteroids is halved:

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F_{2}=G\frac{m_{1}m_{2}}{\frac{r^{2}}{4}}

F_{2}=G\frac{4m_{1}m_{2}}{r^{2}}=4G\frac{m_{1}m_{2}}{r^{2}}

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