Question 239: Laws of Motion

Question

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g = 10 ms$$-$$2, the tension in the supporting cable is

Accepted Answer

Here, Mass of a person, m = 60 kg
Mass of lift, M = 940 kg,
a = 1 m/s
2
, g = 10 m/s
2
Let T be the tension in the supporting cable.
$$ 	herefore $$ T Ã¢ÂÂ (M + m)g = (M + m)a
$$ \Rightarrow $$ T = (M + m)(a + g)= (940 + 60)(1 + 10) = 11000 N

Answer

8600 N

Answer

9680 N

Answer

11000 N

Answer

1200 N

Laws of Motion

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g = 10 ms$-$2, the tension in the supporting cable is

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