A step-type escalator as shown below is designed to transport 100 persons per mi

Question

A step-type escalator as shown below is designed to transport 100 persons per minute at a constant rate of 2 ft/s. The overall efficiency of the escalator is estimated to be 75% and a 200% overload is allowed. Assuming the average weight per person is 180lb, determine the required capacity of the motor of the escalator in horsepower.

Two swimmers A and B, of mass 60 kg and 40 kg, respectively, dive off the end of a 100-kg boat. Each swimmer dives so that his relative horizontal velocity with respect to the boat is 5 m/s. If the boat is initially at rest, determine its final velocity swimmer A dives first, and (b) swimmer B dives first. A step-type escalator as shown below is designed to transport 100 persons per minute at a constant rate of 2ft/s. The overall efficiency of the escalator is estimated to be 75% and a 20 overload is allowed. Assuming the average weight per person is 180 lb, determine the requi capacity of the motor of the escalator in horsepower. A roller coaster starts from rest at A, rolls through a circular loop, what is the height h required for a 3g experience at B? What is the normal force at D?

Explanation / Answer

15/2 sinw ft=7.5cosecw =t

180 lbs*200 *g *15 ft=energy to take 200 people up suppose E

power=E/t

since eff is 75%

power*100/75=required power

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