The tension in the cable supporting a lift is more when the lift is
________ .
लिफ्ट को सहारा देने वाली केबल में तनाव तब अधिक होता है जब लिफ्ट ________ होती है।
moving downwards with uniform velocity
moving upwards with uniform velocity
stationary
moving upwards with acceleration.
moving upwards with acceleration.
Now, Tension in cable when the lift is
stationary is given by,
Ts = W = mg
Tension in cable when the lift is moving downward is given by,
Td = mg - ma = m(g - a)
Similarly, tension in cable when the lift is moving upward is given by,
Tu = mg + ma = m(g + a)
Tension in cable when the lift is moving upward with uniform velocity (a = 0) is given by,
T uniform = mg + ma = mg
It is clear that, the tension in cable
is maximum when the lift is moving upward with an acceleration.
Hence, the correct option is (D).
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