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The weight (w) of an object in pounds is related to its distance (d) from the center of the earth by the equation: w= 320 over (d)cubed or 320
D2 Where (d) is in thousands of miles. How much does the object weigh at sea level which is about 4,000 miles form the center of the earth?

2007-11-19 16:19:11 · 3 answers · asked by sistermoon 4 in Science & Mathematics Mathematics

3 answers

d^3 is cubed
d^2 is squared

I think you mean 320 over d *squared* or:
w = 320 / d²

Where d is the distance from the center of the earth in thousands of miles.

In your example, the distance is 4 thousand miles, so d = 4.

Simply plug it into the equation:
w = 320 / (4)²
w = 320 / 16
w = 20

The object weighs 20 pounds at sea level.

P.S. You can add additional comments to your question without having to post with a second account.

2007-11-19 17:21:38 · answer #1 · answered by Puzzling 7 · 0 0

sry, i meant 320/ d^2 d is cubed. i just signed in on my other account. but i will still be able to see the answer on the other account.

2007-11-20 00:35:54 · answer #2 · answered by Indigo gurl 1 · 0 0

w = 320/d³ or w = 320D² ????
which is it? what's the difference between d and D? doesn't the size of the object matter, or its density?

2007-11-20 00:31:50 · answer #3 · answered by Philo 7 · 0 0

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