Posted by **Anonymous** on Sunday, June 29, 2014 at 1:06am.

A large store escalator that is designed to transfer customers to one floor to another, a vertical distance of 8.0m. It takes each person 20 seconds to ride from bottom to top of the escalator. Explain how you would determine the power of the escalator motor.

- Physics -
**Damon**, Sunday, June 29, 2014 at 6:23am
Guess mass of person, say 80 kg

guess how many on elevator, say 50 (guess high, we want a strong enough motor)

so total mass of people on elevator at one time = 80*50 = 4,000 kg

energy change = m g h

= 4,000 * 9.8 * 8 = 316,600 Joules

divide by 20 seconds

----> 15,688 Watts

If the efficiency is 40% then you need about a 40 kw motor

## Answer This Question

## Related Questions

- physics - An escalator is 15.0 m long. If a person stands on the escalator, it ...
- physics - In a mall, a shopper rides up an escalator between floors. at the top ...
- geometry - an escalator lifts people to the second floor, 25 ft above the first ...
- Physics - A person climbs from a Paris metro station to the street level by ...
- Physics - A person climbs from a Paris metro station to the street level by ...
- Physical Science - An escalator 14 m long is carrying a 70-kg person from one ...
- Algebra 2 - If Graham runs up 6 steps of the escalator, then it takes him 46.5 ...
- math - one elevator leaves first floor of a building at 9:00 a.m. It takes 5 ...
- Algebra - If Angela runs up 5 steps of the escalator, then it takes her 40 ...
- Ap Physics - An escalator in a shopping centre carries people up through a ...

More Related Questions