Question

experiment on archimedes's principal of flotation

Answer 1

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EQUIPMENT

Triple-Beam Balance with string

Graduated Cylinder

Pipette

Cylinders: (2) Metal, (1) Wood

(Note: The cylinders have sharp hooks)

Overflow Container

Spouted Can

Digital Balance

(2) 123-Blocks

Wood Board/Block

Rod & Clamp

Paper Towels

Water

PROCEDURE

PART 1: Overflow Method

1. Measure the mass of the brass cylinder. Determine

its weight, Fg.

2. Place the overflow container on the digital balance.

3. Fill the spouted can with water. Position it so that

its spigot pours into the overflow container.

4. Submerge the brass cylinder in the water, allowing

displaced water to collect in the overflow container.

5. Measure the mass of the displaced water; calculate

its weight. This is the buoyant force, FB.

6. Calculate ρobj (density of the object):

ρobj =

ρW Fg

FB

(10.4)

PART 2: Direct Measurement - Mass

7. Calibrate the triple beam balance.

8. Suspend the object (brass cylinder) from a string

attached to the balance.

9. Partially fill the overflow container with water, then

submerge the object. Do not allow the object to

touch the container. Measure the apparent mass of

the object in water, m′

. Calculate F

′

g

.

10. Determine FB for the object. How much less does

it weigh in water than in air? (Eq. 10.1)

11. Calculate ρobj using Eq. 10.4.

PART 3: Displacement Method - Volume

12. Partially fill the graduated cylinder with water; take

note of the water level. Use the pipette to fine-tune

the meniscus.

13. Carefully submerge the object in water and deter-

mine its volume.

14. Remove and dry the object, then empty the gradu-

ated cylinder and invert it on a paper towel to dry.

15. Determine FB on the object with Eq. 10.2.

16. Calculate ρobj using Eq. 10.5:

ρobj =

m

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