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A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up, the reading will be:
- a)zero.
- b)equal to 76 cm.
- c)more than 76 cm.
- d)less than 76 cm.
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
A barometer kept in a stationary elevator reads 76 cm. If the elevato...
If lift moves upwards with some acceleration, then effective g increases. So the value of h decreases i.e. reading will be less than 76 cm.
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A barometer kept in a stationary elevator reads 76 cm. If the elevato...
Explanation:
Pressure in an Elevator:
When an elevator is stationary, the barometer reading inside the elevator is equal to the atmospheric pressure outside, which is 76 cm.
Effect of Acceleration:
When the elevator starts accelerating upwards, the apparent weight of the air column above the barometer decreases. This leads to a decrease in the pressure inside the elevator.
Reasoning:
As the elevator accelerates upwards, the pressure inside the elevator decreases. This is because the force of gravity acting on the air column above the barometer is reduced due to the acceleration. This decrease in pressure will cause the reading on the barometer to be less than 76 cm.
Therefore, the correct answer is option d) less than 76 cm.
Pressure in an Elevator:
When an elevator is stationary, the barometer reading inside the elevator is equal to the atmospheric pressure outside, which is 76 cm.
Effect of Acceleration:
When the elevator starts accelerating upwards, the apparent weight of the air column above the barometer decreases. This leads to a decrease in the pressure inside the elevator.
Reasoning:
As the elevator accelerates upwards, the pressure inside the elevator decreases. This is because the force of gravity acting on the air column above the barometer is reduced due to the acceleration. This decrease in pressure will cause the reading on the barometer to be less than 76 cm.
Therefore, the correct answer is option d) less than 76 cm.
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A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up, the reading will be:a)zero.b)equal to 76 cm.c)more than 76 cm.d)less than 76 cm.Correct answer is option 'D'. Can you explain this answer?
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