Question

13. A person, weighing 56 kg is standing in a lift. Find the weight as recorded by the weighing machine when, (a) The lift is stationary (b) The lift moves upward with a uniform velocity of 2.1 m/s (c) The lift moves downward with a uniform velocity of 2.1 m/s (d) The lift moves upwards with a uniform acceleration of 2.1 m/s^ 2 . (e) The lift moves downwards with a uniform acceleration of 2.1 m/s ^ 2 ​

Answer 1

A

48 kg

Mass of the man m=40kg

Acceleration of lift in upward direction a=2m/s

2

Let the weight shown by machine be N.

Equation of motion for the body : ma=N−mg

We get N=m(a+g)

∴ N=(40)(2+10)=480 N

Thus weight of the man recorded by machine W

′

=

g

N

∴ W

′

=

10

480

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=48 kg