On Planet X, a 70 kg object can be lifted by a force of 400 N

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On Planet X, a 70 kg object can be lifted by a force of 400 N, indicating a gravitational acceleration of 5.7 m/s². For a car with a mass of 1500 kg, the weight is calculated as 8550 N using the formula W=mg. There is a mention of an incorrect answer on a referenced site regarding this calculation. A suggestion is made to use more significant figures during calculations to improve accuracy. The discussion emphasizes the importance of precision in scientific computations.
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On Planet X, a 70 kg object can be lifted by a force of 400 N
Suppose your car was taken to Planet X. If the car has a mass of 1500 kg, what would its weight be?

W=mg

a=W/m
a=400/70
a=5.7m/s/s

W=1500*5.7
W=8550N

on the site http://library.thinkquest.org/10796/ they say that the answer is incorrect. Quiz is under 4. Forces and Newton's Laws/scroll down to the bottom
 
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Hi EJ25! Welcome to PF! :smile:

I suspect you didn't use enough significant figures in your intermediate stages …

it's always best to use an extra figure or two until just before the end :wink:
 
Hi

thank you very much and thanks for the info.
 

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