Physics

Problem

Tension in a string holding a mass inside a lift a. A mass of

5\,\text{kg}

is suspended from the ceiling of a lift by a light, inextensible string. Taking

g = 9.8\,\text{m s}^{-2}

, calculate the tension in the string when the lift: (a) is at rest or moving with constant velocity; (b) moves upward with an acceleration of

2\,\text{m s}^{-2}

; (c) moves downward with an acceleration of

3\,\text{m s}^{-2}

; (d) is in free fall after the supporting cable snaps.