Unit 2 Quiz 1 1. The diagrams below show pulses as they head toward each other. Using the principle of superposition, show the appearance of the string at the instant the centers of the pulses overlap. A B A B 2. Pulses are sent down a stretched spring. Answer the following questions about the speed of a pulse. a) If the spring is shaken with amplitude twice as large, what will happen to the pulse speed? G L S (Greater, Less, Same) b) The people holding the spring move 1 meter closer, what will happen to the pulse speed? G L S c) What would happen to the pulse speed if the hand shaking the spring goes up and down in half the time? G L S d) What would happen to the pulse speed if the hand shakes the spring with more force? G L S e) What would happen to the pulse speed if the pulse is made longer? G L S f) If the spring is replaced with one with the same tension, but twice the linear density what will happen to the pulse peed? G L S 3. Sketch the two ropes below just after the original pulse reflects off hits the wall. (The pulses may be placed on the diagram below right.) The rope with stripes has the higher lin