A 4 0 kg block is suspended from the ceiling of an elevator through a string having a linear mass density of 19 2 × 10 − 3 kg m − 1 . Find the speed (with respect to the string) with which a wave pulse can proceed on the string if the elevator accelerates up at the rate of 2 0 m s − 2 . Take g = 10 m s − 2 .

Question

Philoid · Accepted Answer

50 m s⁻¹

If we observe this from the frame of string, then we are going to measure an increase in mass due to pseudo force. This will increase the tension on the string.

The mass density is 192 × 10⁻³ kg m⁻¹

So, the speed will be,