Which component is found only in electric generators and not in electric motors?

a commutator

brushes

an armature

slip rings

Where do television waves come from? Where do radio waves come from?

What device is used to protect bulidings from lightning strikes

3. Which of the following units is NOT a scalar quantity? A. Temperature B. Acceleration C. Speed D. Mass

Elements in the family often have a similar

Which is least likely to cause a landslide? A. The force of gravity B. The growth of vegetation C. An increase in the slope of a hill D. Saturation of the ground by water

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car acceleration?

Why can crevasses in glaciers only be 50 meters deep? A. Plastic flow occurs below that depth. B. Glaciers cannot be thicker that 50 Meters. C. Surges prevent plastic flow below that depth. D. Basal slip occurs below that depth.

What are the changes to Earth's surface that occur as a result of plate movement

Two spaceships are approaching each other. (a) If the speed of each is 0.9c relative to Earth, what is the speed of one relative to the other?

Mechanical work is done an object when a force displaces the object in the direction of the force or a component of the force. True or false?