A string is connected at one end to a vibrating reed and on the other to a weight pulling the string tight over a pulley. At the time t = 0 a photograph of the string looks like the picture at the left below. The wave is then observed to grow in amplitude, reaching a maximum of 3 cm at t = 0.02 sec. It then shrinks in amplitude, and then at time t = 0.06 sec appears flat, as shown in the picture to the right below.

(17%) Problem 1: A string is connected at one end to a vibrating reed and on the other to a weight pulling the string tight over a pulley. At the time t = O a photograph of the string looks like the picture at the left below. The wave is then observed to grow in amplitude, reaching a maximum of 3 cm at t = 0.02 see. It then shrinks in amplitude, and then at time t = 0.06 sec appears at, as shown in the picture to the right below. t=U sec t=U.06 sec A III-- Ill-IIIIIEEI Each box in the grid has a side of 1 cm. A 10% Part (a) In what direction is point A (shown on the left graph above) moving at t = 0? Down, Grade Summary Deductions UP- Potential 100% Right. It is not moving at all. Submissions ' . Lf't Attempts remaining: _ i ( per attempt) dailed view Submit I give up! Hints: for a deduction. Hints remaining: Feedback: deduction per feedback. A 10% Part (b) In what direction is point B (shown on the left graph above) moving at t = 0? A 10% Part (c) Is point A or B moving faster at t: 0? A 10% Part ((1) In what direction is point A moving at t = 0.06? A 10% Part (e) In what direction is point B moving at t = 0.06? A 10% Part (f) Is point A or B moving faster at t = 0.06? A 10% Part (g) Between t = 0 and t = 006, would point A have moved to the left or the right on the string? A 10% Part (h) Between t = 0 and t = 0.06, would point B have moved to the left or the right on the string? A 10% Part (i) What is the period of the oscillation in seconds? A 10% Part (j) Explain what could be changed to make the velocity of point A zero throughout the oscillation. Give two different ways to do this, and explain why such a change would work