Homework Help: Physics

Posted by Sara on Sunday, November 28, 2010 at 7:21pm.

A beaker of mass 1.2 kg containing 2.1 kg
of water rests on a scale. A 2.2 kg block of aluminum (of density 2700 kg/m3) suspended from a spring scale is submerged in the water.
Find the reading of the upper scale (the spring scale). The acceleration of gravity is 9.81 m/s2 . Answer in units of N.
Find the reading of the bottom scale(scale placed under the beaker).
Answer in units of N.

Physics - bobpursley, Sunday, November 28, 2010 at 7:25pm
The lower scale supports the beaker, water, and the buoyant force of water on the aluminum

buoyantforce= densitywater*g*volumeAl

volumeAl= massAl/denstityAl
Physics - Sara, Sunday, November 28, 2010 at 7:33pm
and what about the spring scale?
is it apparent weight = actual weight - densitywater*g*V ?
Physics - bobpursley, Sunday, November 28, 2010 at 7:40pm
yes.

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