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Question
A person standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with uniform downward acceleration of 1.8 m/s2 will be ______ N. [g = 10 m/s2]
Options
192
294
393
492
MCQ
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Solution
A person standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with uniform downward acceleration of 1.8 m/s2 will be 492 N. [g = 10 m/s2]
Explanation:
Mass of the person, M = 60 kg
Tension in the lift's rope as it moves downward with acceleration a,
T = M(g - a)
= 60 (10 - 1.8)
= 492 N
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Motion of Connected Bodies, Pulley and Equilibrium of Forces
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