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  • Tell me? The mass of a liftis 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is:

The mass of a lift is 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is:

  • Option 1)

    4ms-2 upwards

  • Option 2)

    4ms-2 downwards

  • Option 3)

    14ms-2 upwards 

  • Option 4)

    30ms-2 downwards 

 

Answers (1)

As we discussed in concept

Newton's 2nd Law -

F\propto \frac{dp}{dt}

F=\tfrac{kdp}{dt} 

F=\tfrac{d\left (mv \right )}{dt} 

F=\tfrac{m\left (dv \right )}{dt}

\frac{dv}{dt}=a

Therefore  F=ma

- wherein

K=1 in C.G.S & S.I

 

 Net force (F) = T - mg

                     ma = T - mg

2000 a = 28000 - 20000 = 8000

a\:=\: \frac{8000}{2000} = 4\:ms^{-2}\:(upwards)

 


Option 1)

4ms-2 upwards

This option is correct.

Option 2)

4ms-2 downwards

This option is incorrect.

Option 3)

14ms-2 upwards 

This option is incorrect.

Option 4)

30ms-2 downwards 

This option is incorrect.

Posted by

subam

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