Question

An elevator cab that weighs 27.8 kN moves upward. What is the tension in the cable if the cab’s speed is ___.

Find the mass of the elevator:

a. At rest

b. Uniform motion

Answer 1

Given:

$W=27.8*10^3\:\rm N$

The tension in cable

$$T=W+ma$$

a. $a=0$

$$T=W=27.8\rm \: kN$$

b. $a=0$

$$T=W=27.8\rm \: kN$$