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  • A man weighs 80kg. He stands on a weighing scale in a lift which is moving upwards with a uniform accelaration <img alt="10m/s^2" src="http://entrancecorner.oncodecogs.com/gif.latex?10m/s%5E2"

A man weighs 80kg. He stands on a weighing scale in a lift which is moving upwards with a uniform accelaration 10m/s^2. What would be the reading (in Kg) on the scale(g=10m/s^2).

Option: 1

160


Option: 2

100


Option: 3

150


Option: 4

90


Answers (1)

best_answer

Solution :
Given:

Acceleration of the lift a = 10 m/s2

Let the normal reaction from the weighing machine (Reading of weighing machine) on man be R.

F.B.D of man-

 

R-mg=ma\\ R=m(g+a)=80\times(10+10)\\ R= 1600N

Let apparent mass of man be m_{app}-

\\ R=m_{app}g \\ m_{app}\times10=1600\\ \Rightarrow m_{app}=160kg

Posted by

rishi.raj

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