A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. neither wire nor magnet is moving.
c. the wire's axis is parallel to the field. d. the wire is moved perpendicularly to the field.
D
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The antinode of a standing wave represents a point of
A. no motion B. maximum motion
The wavelength of an electromagnetic wave is 600 nm. What is its frequency?
A) 200 × 1012 Hz B) 300 × 1012 Hz C) 400 × 1012 Hz D) 500 × 1012 Hz E) 600 × 1012 Hz
A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The surface is now tilted at 20° and the block is projected up the surface with the same initial speed, v. Assume that the friction force remains the same as when the block was sliding on the horizontal surface. When the block
comes to rest momentarily, how does its total mechanical energy compare to the case where the block slid horizontally comes to rest? 1.It is the same. 2.It is less in the case where the block went up the slope. 3.It is more in the case where the block went up the slope. 4.We cannot tell from the information given.
A cup of water is filled to the brim when an ice cube is placed in it. The tip of the ice cube sticks out of the surface. As the ice melts, you observe that
A) the cup overflows. B) the cup might overflow but it depends on the actual mass of the ice cube. C) the water level remains the same. D) the water level actually goes down. E) There is not enough information to answer this question.