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October 21, 2014

Homework Help: physics

Posted by taz taz pakhtoon on Tuesday, June 3, 2008 at 6:55am.

a body of mass 1kg on the equator rotates about the axis of the earth with a period of 1 day. (mass of earth = 5.98x10^24kg n may b assumed to b concentrated at its centre n radius of earth = 6380km)
first question asks to calculate gravitational force of attraction between earth n mass....simple enuff
second qs asks to work out centripetal force on mass...easy
then it asks us to work out the difference between these two forces n use the answer as the resultant force to calucalte g at the equator using F =ma; what i've been taught is centripetal force is the resultant force so then y the need to find resultant force as the qs says. and then wat i also dont understand is why the resultant force is the difference between two forces that are acting in the same direction.
if someone cud clarify id b gr8ful
thanks in advance

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