19. The work done by a magnetic field on a charged particle moving in it is:

a. Double that in electric field b. half that in clectric field czero

d. none of these

What name is given to a fuel made from living organisms or their waste?

What does the rate of solution measure how fast a substance recipitates how fast a substance dissolves how much of a substance dissolves how much of a substance precipitates

Which of the following changes will result in a stronger electromagnet? A. Using a longer nail B. Using a lower voltage C. Using more coils of wire D. Using a shorter wire

A ball is thrown directly downward with an initial speed of 8.00 m/s, from a height of 30.0 m. After what time interval does it strike the ground?

By applying a 12-newton horizontal force, a 7-kilogram block is moved 12 meters in 3 seconds on a frictionless, horizontal surface. How much power was used in moving the block. A) 144 watts B) 112 watts C) 16 watts D) 48 watts

What often happens to light when it travels from one medium to another

60,000 is 100 time as much as

A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3.

Which of the following atoms do not usually form bonds

The red LED consists of a white LED covered with a red filter. What does the red filter do?