In an electric motor, the rotating coil of wires wrapped around an iron core is a (n)

brush

transformer

commutator

armature

What are the primary differences between stars and planets

What will happen if an electron is added to an atom

A car moving at 50 km/hr skids 20 m with locked brakes. how far will the car skid with locked brakes if it were traveling at 150 km/hr?

What is the ratio of the average velocity of hydrogen molecules to that of neon atoms at the same temperature and pressure?

Which of the following factors can affect the rate of soil formation? A. weathering rate B. environmental conditions C. bedrock composition D. all of these

How to reverse the heating effects of electric curent

To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. in one such episode, a 600 g falcon flying at 20.0 m/s ran into a 1.50 kg raven flying at 9.00 m/s.

Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table. A 2 column table with 4 rows. The first column is labeled spring with entries W, X, Y, Z.

Which type of light travels at the fastest speed? a. none of these b. ultraviolet light c. infrared light d. visible light

How far does a car go in 30 seconds at a speed of 29 m/s?