Q2 of 81 Page 271

Consider the equations

and .


In an elevator accelerating upward


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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A liquid can easily change its shape but a solid cannot because

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The three vessels shown in figure (13-Q2) have same base area. Equal volumes of a liquid are poured in the three vessels. The force on the base will be


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Equal mass of three liquids are kept in three identical cylindrical vessels A, B and C. The densities are ρA, ρB, ρC with ρA < ρB < ρC. The force on the base will be