Question on: JAMB Physics - 2011
An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.
[g = 10 ms2]
[g = 10 ms2]
A
50 N
B
520 N
C
220 N
D
80 N
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Correct Option: D
Here's how to solve the problem:
1. **Calculate the weight of the object in air:** Weight in air = 30 kg \* 10 m/s² = 300 N
2. **Calculate the weight of the object in water:** Weight in water = 22 kg \* 10 m/s² = 220 N
3. **Calculate the upthrust:** Upthrust = Weight in air - Weight in water = 300 N - 220 N = 80 N
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