1. Tardigrade
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  3. Physics
  4. A boy of mass 50 kg is standing on a weighing machine placed at the floor of a lift. The machine reads his weight in newtons. What is the reading of the machine, if the lift is moving Upwards with a uniform Speed of 10 text ms-1. (g=10ms-2)

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Q. A boy of mass 50 kg is standing on a weighing machine placed at the floor of a lift. The machine reads his weight in newtons. What is the reading of the machine, if the lift is moving Upwards with a uniform Speed of $ 10\text{ }m{{s}^{-1}}. $ $ (g=10m{{s}^{-2}}) $

EAMCETEAMCET 2009

Solution:

Given that mass of boy m = 50 kg Weighing machine is moving upwards with uniform speed, so acceleration of machine will be zero, a = 0.
$ T-mg=ma $ $ T-50g=50\times a $ but $ a=0 $ $ T=50\,g $ $ T=50\times 10 $ $ T=500\,N $

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