Which of the following energy sources is NOT a type of coal or coal-precursor?

Peat

Petroleum

Lignite

Anthracite

Machine breakdown and repair in a twelve machine factory having three repair mechanics would develop which type of queuing system line structure concerning machine breakdowns?

Which statement best describes how the temperature of the oceans surface water varies

two cans on a sunny window one black and the other white construct and explanation of the effect of sun will have on both cans over a two hour period?

A person of 83 kg is in an elevator. If the elevator is moving at a speed of 5 m/s, what's the person's kinetic energy? Keep 4 significant figures a 1,004 J b 1,038 c 1,280 J d 980 J e 1,435 J

During refraction, what happens to a wave when it travels from one medium to another?

Imagine two artificial satellites orbiting earth at the same distance. one satellite has a greater mass then the other one which of the following would be true about there motion? 1.

What is energy? (Not the answer from google search.)

Explain why the friction force between two surfaces increases if the force is pushing the surfaces together increases.

As energy moves in waves through the water, the water moves a. in waves toward shore. c. in the direction of the waves. b. in a small circular movement. d. against the current.

Which of the following values represents an index of refraction of an actual material? A. 0 B. 1 / 4 C. 5 / 4 D. 1 / 2