Mechanics
a barometer kept in an elevator accelerating upwardreads 76cm. the air pressure in the elevator is??
a barometer kept in an elevator accelerating upwardreads 76cm. the air pressure in the elevator is??
4 Answers
vikash kumar
under normal conditions when the elevator is accelerating upwards the reading in the barometer will be less than 76cm (air pressure is same as external) but as acc. to question the pressure is 76 cm means that the air is applying more pressure to lift the liquid to a height of 76cm.so the air pressure in the lift is higher than the normal(76 cm).
the liqiud becomes heavier m*(g+a) when the lift accelerating upwards. so it requires more more pressure from the air onto the liquid to rise at the height of 76 cm.
Rakesh Ramesh
under normal conditions when the elevator is accelerating upwards the reading in the barometer will be less than 76cm (air pressure is same as external) but as acc. to question the pressure is 76 cm means that the air is applying more pressure to lift the liquid to a height of 76cm.so the air pressure in the lift is higher than the normal(76 cm).
the liqiud becomes heavier m*(g+a) when the lift accelerating upwards. so it requires more more pressure from the air onto the liquid to rise at the height of 76 cm.
Harsh Tyagi
as you accelerate barometre upward the pressure inside the liquid increse but this increment is transmitted all over the liquid according to the pascal law so change in pressure between two points in liquid is constant. in non-inertial case pressure(p) = row(g+a)h. so when first term is increse second term must be decrese to make pressure constant. the actual atmoshperic pressure is same either of the case
Shubhapradha
Actually at heights the pressure decreases but in this question they have given that thereading as 76cm so to get this pressure in the barometer the elevator should contain more pressure in surroundings so the pressure near the elevator is more than 76cm
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