How much below the surface does the accl due to gravity become 70% of its value on the surface of the earth ?
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We use the "Universal Law of Gravitation" to solve the above.
Actually the question is incorrect. accl due to gravity decreases with increase in altitude. You say that the g is 70% of g at surface, so new g would be less than actual g. Hence altitude should increase not decrease. Hence you should ask at what height the g would be 70% of actual g, and not the depth.
Actually the question is incorrect. accl due to gravity decreases with increase in altitude. You say that the g is 70% of g at surface, so new g would be less than actual g. Hence altitude should increase not decrease. Hence you should ask at what height the g would be 70% of actual g, and not the depth.
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