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Potential Energy Formulae

Two bodies ...

Question

Two bodies $P$ and $Q$ have $5 k g$ weight each. Body $P$ is suspended from a spring balance whereas body $Q$ is balanced on a physical balance. Both balances are placed in an elevator, which upwards with an acceleration $g / 2$ . now the:

weight of

P

increases and the weight of

Q

decreases

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weight of

P

increases and the weight of

Q

remains the same.

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weight of

P

decreases and the weight of

Q

remains the same.

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weight of

P

decreases and the weight of

Q

increases

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Solution

The correct option is B weight of $P$ increases and the weight of $Q$ remains the same.
Weight increases for both, but weight recorded remains same for the common balance one, as both sides are affected by pseudo force.
Spring balance will read $w_{s p r i n g} = m (g + a) = m (g + \frac{g}{2}) = \frac{3 m g}{2} = m (\frac{3}{2}) g$
The reading will be $5 \times \frac{3}{2} = 7.5 k g$

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Two bodies P and Q have 5kg weight each. Body P is suspended from a spring balance whereas body Q is balanced on a physical balance. Both balances are placed in an elevator, which upwards with an acceleration g/2. now the:

Two bodies $P$ and $Q$ have $5 k g$ weight each. Body $P$ is suspended from a spring balance whereas body $Q$ is balanced on a physical balance. Both balances are placed in an elevator, which upwards with an acceleration $g / 2$ . now the: