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)

Question

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)  (A) 510 N (B) 480 N (C) 490 N (D) 500 N

Tardigrade Admin · Accepted Answer

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× a but a=0 T=50 g T=50× 10 T=500 N

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 $10 m s^{- 1} .$ $(g = 10 m s^{- 2})$

510 N

480 N

490 N

500 N

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.
$T - m g = ma$ $T - 50 g = 50 \times a$ but $a = 0$ $T = 50 g$ $T = 50 \times 10$ $T = 500 N$

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 10ms−1. (g=10ms−2)