An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?
A) greater than mg
B) less than mg
C) equal to mg
D) depends on the speed of the elevator

Question

Quizplus · Accepted Answer

When the elevator is increasing its upward speed, it is accelerating upwards. This means the object experiences a greater force due to the combined effect of gravity and the upward acceleration of the elevator. Therefore, the tension in the string must be greater than mg to counteract these forces and hold the object in place.

An Object of Mass M Is Hanging by a String