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Physics Homework Help?

0 votes

A 0.78-kg piece of wood floats in water but is found to sink in alcohol (SG=0.79), in which it has an apparent mass of 0.088 kg .

What is the SG of the wood?

asked Oct 30, 2015 in PHYSICS by anonymous

1 Answer

0 votes

Step 1:

The weight of the wood is image.

The specific gravity of alcohol is image.

The apparent weight of the wood is image.

The apparent weight of the wood image, where image is buoyant force.

The buoyant force is image.

image

image.

The weight of the wood is image.

Step 2:

Specific gravity of an object is the ratio of density of sample to density of reference substance.

The specific gravity of alcohol is image.

image.

The specific gravity of wood is image.

image.

Step 3:

Find the specific gravity of wood.

Consider image.

image

Substitute image and image.

image

image

image

image

image

image.

The specific gravity of wood is image.

Solution:

The specific gravity of wood is image.

answered Oct 31, 2015 by Sammi Mentor
edited Oct 31, 2015 by Sammi

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