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A stone is released from an elevator goi...

A stone is released from an elevator going up with an acceleration 'a'.The acceleration of the stone after the release is

A

a upward

B

(g-a) upward

C

(g-a) downward

D

g downward

Text Solution

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The correct Answer is:
D
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A block slides down from top of a smooth inclined plane of elevation theta fixed in an elevator going up with an acceleration a_(0) . The base of incline has length L. Find the time taken by the block to reach the bottom.

A block slides down from top of a smooth inclined plane of elevation theta fixed in an elevator going up with an acceleration a_0 The base of incline has length L. Find the time taken by the block to reach the bottom.

Knowledge Check

  • A uniform triangular plate ABC of moment of inertia I (about an axis passing through A and perpendicular to plane of the plate) can roatete freely in the vertical plane about point 'A' as shown in figure. The plate is released from the position shown in the figure. Line AB is horizontal. The acceleration of the centre of mass just after the release of plate is :

    A
    `("mga"^(2))/(sqrt(3I))`
    B
    `("mga"^(2))/(sqrt(4I))`
    C
    `("mga"^(2))/(2sqrt(3I))`
    D
    `("mga"^(2))/(3I)`

  • The mass of a balloon with its contents is 1.5 kg. It is descending with an acceleration equal to half that of acceleration due to gravity. If it is to go up with the same acceleration keeping the volume same, its mass should be decreased by

    A
    1.2kg
    B
    1kg
    C
    0.75kg
    D
    0.5kg

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