# Fluids Problem (Buoyancy)

## Study Problem

A piece of equipment weights 300 pounds on dry land. When the equipment is fully submerged in water the equipment weighs only 65 pounds.

What is the volume of the equipment?

A) 3.77 ft^{3}

B) 1.96 ft^{3}

C) 0.78 ft^{3}

D) 1.28 ft^{3}

What is the specific gravity of the equipment?

A) 1.03

B) 0.78

C) 1.28

D) 0.82

If the equipment was submerged in API 42 Oil, what would the equipment weight?

A) 246 lbs

B) 79 lbs

C) 193 lbs

D) 107 lbs

## Solution

This fluids study problems explains how to calculate volume, specific gravity and weight of an object when placed in water and crude oil.

#### Calculating buoyant force of water

#### Calculating the volume of water displaced

The volume is 3.77 cubic feet

Choice A is correct

#### Calculating specific gravity of the equipment

The specific gravity of the equipment is 1.28

Choice C is correct

#### Convert API to SG

#### Calculate density

#### Calculate the weight of oil displaced

#### Calculate the weight of the equipment in oil

The weight of the equipment in oil is 107 lbs

Choice D is correct