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A block of mass 'm' is raised by a man o...

A block of mass 'm' is raised by a man of mass `m_2` in two different ways as shown (`m_1 = 25kg, m_2 = 50kg)`

A

The action of the man on the floor in first case is 750N

B

The action of the man on the floor in second case is 250N

C

The action of the man on the floor in first case is 250N

D

The action of the man on the floor in second case is 750

Text Solution

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The correct Answer is:
A, B
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A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. What is the action on the floor by the man in the two cases ? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding ?

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig . What is the action on the floor by the man in the two cases ? If the floor yields to a normal force of 700 N , which mode should the man adopt to lift the block without the floor yielding ?

Knowledge Check

  • A body of mass 4 kg is attached to another body of mass 2 kg with a massless rod. If the 4 kg mass is at (2i + 5j)m and 2 kg mass is at (4i + 2j)m, the centre of mass of the system is at (in m)

    A
    `8i+12j`
    B
    `(1)/(2)(8i+12j)`
    C
    `(1)/(3)(8i+12j)`
    D
    `(1)/(4)(8i+12j)`

  • A body of mass 4kg is attached to another body of mass 2kg with a massless rod. If the 4kg mass is at (2i+5j)m and 2kg mass is at (4i+2j)m , the centre of mass of the system is at (in m)

    A
    `8i+12j`
    B
    `(1)/(2)(8i+12j)`
    C
    `(1)/(3)(8i+12j)`
    D
    `(1)/(4)(8i+12j)`

  • Two blocks of masses '3m' and '2m' are in contact on a smooth table. A force P is first applied horizontally on block of mass '3 m' and then on mass '2m'. The contact forces between the two blocks in the two cases are in the ratio:

    A
    `1:2`
    B
    `2:3`
    C
    `3:2`
    D
    `5:3`

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