Consider a rope hung from the top of a tall ceiling to the ground. Someone sets up waves from the bottom of the rope and watches as they propagate up the rope. The wave's speed along the vertical rope will
1.remain constant up the rope.
2.increase with vertical position up the rope.
3.decrease with vertical position up the rope.
4.increase until midway up the rope, then decrease.
2
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Atoms can be photographed by
A) electron beams. B) scanning electron microscopes. C) both of these D) neither of these
A mass is oscillating on a spring with a period of 4.60 s. At t = 0 s the mass has zero speed and is at x = 8.30 cm. What is the value of t the first time after t = 0 s that the mass is at x = 4.15 cm?
A) 0.575 s B) 0.767 s C) 1.15 s D) 1.30 s E) 1.53 s
An image is formed by a converging lens. Suppose the bottom half of the lens in covered, as shown
What happens to the image?
Sources of red, blue, and yellow light each emit light with a power of 50 mW. Which source emits the least photons per second?
a. the red source b. They all emit the same number per second. c. the blue source d. the yellow source