# I have a hard time solving this problem.

The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320 times Earth's. An apple weighs 1.0 N on Earth. How much would it weigh on Jupiter?

wouldn't one multiply by 320(proportional to mass) and divide by 11 squared (inversely proportional to the square of distance)?

2.6N

Question ID
421

Created
August 28, 2005 4:10am UTC

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-1

6

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1679

1. Yes I just had a problem like this too. You would multiply by 320 and divide by 11 squared. 2.6 N would be correct for 2 signifigant digits.

25129

Created
August 26, 2007 9:24pm UTC

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2. The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320 times Earth's. An apple weighs 1.0 N on Earth. How much would it weigh on Jupiter?

27521

Created
September 5, 2007 1:34pm UTC

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3. In cleaning out the artery of a patient, a doctor increases the radius of the opening by a factor of two. By what factor does the cross-sectional area of the artery change?

27522

Created
September 5, 2007 1:37pm UTC

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4. The average speed of a nitrogen molecule in air is proportional to the square root of the temperature in kelvins. If the average speed is 475 m/s on a warm summer day (temperature = 300.0 kelvins), what is the average speed on a cold winter day (250.0 kelvins)?

27524

Created
September 5, 2007 1:39pm UTC

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0

5. gfd

397073

Created
September 7, 2010 10:32pm UTC

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