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November 27, 2014

November 27, 2014

Posted by **usha** on Monday, August 15, 2011 at 1:02pm.

- physics -
**bobpursley**, Monday, August 15, 2011 at 3:28pmLets do this the long way.

In the water, the net force=mass*acceleration (neglecting considerable friction).

but net force=bouyantforce-mg or

bouyant force=mass*g* 1/3 +mg=4/3 mg

this bouyant force does not change. So to go now,

bouyant force-(m+Masssand)g=-1/4 (M+m)

4/3 mg-mg-Mg=-1/4 mg

Mg=mg(.25+1.33)

solve for M

check all this.

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