Q. 23.7( 3 Votes )

Consider the equations

and .

In an elevator accelerating upward

A. both the equations are valid

B. the first is valid but not the second

C. the second is valid but not the first

D. both are invalid

Answer :

The first equation describes the pressure acting on a point (area tends to zero). Thus it is valid even in all frames as the excess acceleration is taken care if by the force term. The second equation is invalid as the acceleration if a body in an elevator accelerating upwards is not “g” but “a+g” where “a” is the upwards acceleration of the elevator.

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