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Buoyancy. Archimedes' Principle
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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 9.5 | Buoyancy. Archimedes' Principle |
Buoyancy. Archimedes' Principle Revision Questions
1. What force is needed to keep a ball immersed in water if the ball's diameter is 21 cm? Take g = 10 m/s2, π = 22 / 7, ρwater = 1000 kg/m3 and the air density inside the ball as ρair = 1.3 kg/m3. Do not consider the material the ball is made (it is already included in the value of air density).
- 48.45 N
- 48.51 N
- 0.63 N
- 0.81 N
Correct Answer: A
2. An object weight 17 N on the ground and 12 N when immersed in water. What is the volume of this object in cm3? Take ρwater = 1000 kg/m3 and g = 10 m/s2.
- 0.0005 cm3
- 0.5 cm3
- 500 cm3
- 1200 cm3
Correct Answer: C
3. A balloon weighs 10000 N when empty. Its volume when flying is 2000 m3. The balloon works with hot air (ρhot air = 0.8 kg/m3). What additional weight can it carry to stay stationary in air? Take ρcold air = 1.3 kg/m3 and g = 10 m/s2. Take the figure in the last solved example as a reference.
- 26 000 N
- 16 000 N
- 10 000 N
- 0 N
Correct Answer: D
(the balloon is already stationary in air)
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- Continuing learning density and pressure - read our next physics tutorial: Bernoulli Equation
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