A 700 kg elevator lifts 300 kg of passengers up 20 meters. It performs this task in 40 seconds. W
How many Watts of power was developed by the elevator and passenger system?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the