Physics questions (problems), please help.

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moto_za

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can someone please help me with these: thanks a bunch:

1) The olympic diving tower is 10 meters high. The top platform is about three meters long.

A good runner could get into trouble by taking a running dive and overshooting the length of the diving pool.

Make a reasonable assumption about a good runner's maximum speed and estimate the minimum length for a "safe" diving pool.

2) A football is kicked at ground level in such a way that the horizontal component of its initial velocity is 7 m/s, while the vertical component is 10 m/s. When it returns to the ground the football will have a speed of about:

17 m/s.

7 m/s.

12 m/s.

It cannot be determined from the data.

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This thread will be closed, but here goes.

The answer for the first question depends on the angle, but you can say a good runner runs a 10 s 100 m, so 10 m/s. If you assume the runner has only horizontal velocity at the end of the board, then you only need to calculate two things: the time it takes for the diver to fall 10 m and the horizontal distance the diver travels in that time + 3 m (i.e. 10t + 3).

For the second, assuming no big loss to wind, your velocity will be the same when the ball lands as when it takes off. In this case, the answer would be sqrt (7^2 + 10^2), which is approximately one of the answers. Without knowing about wind though, an argument for choice D can be made.
 
Sorry OP but this isn't a homework help forum. You could possibly get some relevant physics help in the MCAT forum, but not answers to specific homework questions like this.

Closing this thread, please refrain from posting threads like this in the future :) .
 
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