A light bulb is in front of a converging lens, creating a well-focused image of the light bulb on the screen on the opposite side of the lens. If the light is moved farther from the lens, how can the screen be adjusted to keep the image in focus?
A. The screen should be moved further from the lens.
B. The screen should be made larger, but in the same place.
C. The screen should be moved closer to the lens.
D. No changes need to be made to the screen.
Ans: C. The screen should be moved closer to the lens.
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Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?
a. The hardwood floor is at a lower temperature than the rug. b. The hardwood floor is at a lower temperature than your feet. c. The hardwood floor conducts heat away from your feet better than the rug. d. all of the above
Compared with a motor, a generator is
A) one and the same. B) its opposite. C) of an entirely different design.
The figure below is a graph of the magnitude B versus time for a magnetic field that passes through a fixed loop and is oriented perpendicular to the plane of the loop. Rank the magnitudes of the emf generated in the loop at the three instants indicated from largest to smallest
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time. B. the same distance up as before, but take a longer time. C. a smaller distance up, but take a shorter time. D. a greater distance up, but take a longer time. E. a greater distance up, but take the same time.