Each escalator has one motor with an average power of 4000 W. The motor is turned on for an average of 8 hours
each day, 6 days each week. Electricity costs 15 pence
per kilowatt-hour.

Calculate the cost of the electricity used in an average
week to run one escalator.​

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?