The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. minimum power rating of the motor should be

Which proportionality does Kepler's third law describe?

Which physical layer of earth is broken into tectonic plates?

What causes light traveling in a straight line to bend? A traveling through a dense liquid B moving toward a solid object C traveling through a uniform medium D moving through the boundary of a new medium

What is the relationship between the number of loops of wire and the magnitude of the magnetic field?

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at - 9°C to water at 0°C? A. 2.48 MJ B. 2.13 MJ C. 3.26 MJ D. 3.09 MJ

What are some things cyclists do to reduce friction?

A person with his ear to the ground, sees a huge stone strikethe concrete pavement. A moment later two sounds are heard from theimpact: one travels n the air and the other in the concrete, andthey are 2.2 s apart.

An athlete on a sled is moving with a speed of 3.0 m/s across a pond covered with ice. If the total mass of the sled-athlete system is 95.0 kg, what magnitude of the average force is required to bring the sled to rest in 15.0 s

What device is used for side mirrors on automobiles

In order for an object to accelerate, what must be applied?