- #1
whitehorsey
- 192
- 0
1. An elevator (mass 4700 kg) is to be designed so that the maximum acceleration is 6.80×10-2. What is the maximum force the motor should exert on the supporting cable?
Force Diagram:
Force Tension
|
elevator
|
mg
3. FT = ma + mg
4700[(0.068(-9.8) - 9.8)]
= -435178.8N
but the answer should be positive. Why isn't gravity negative?
Force Diagram:
Force Tension
|
elevator
|
mg
3. FT = ma + mg
4700[(0.068(-9.8) - 9.8)]
= -435178.8N
but the answer should be positive. Why isn't gravity negative?