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

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SUMMARY

On Planet X, a 70 kg object experiences a lifting force of 400 N, resulting in an acceleration of 5.7 m/s². When calculating the weight of a 1500 kg car on Planet X, the formula W=mg yields a weight of 8550 N. The discussion highlights the importance of using significant figures in calculations, as noted by a participant who pointed out potential inaccuracies due to insufficient precision. The source of the quiz question is identified as being from a specific educational website.

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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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