Figure 1 String B _ U Also Strlng B Also String A U ' = 'II String A Figure 1, above, shows the situation in the rst ve questions on this quiz. You might want to read questions 2, 4 and 5 before answering questions 1 and 3. Three blocks, labeled 1, 2, and 3, are connected by two massless strings, labeled A and B. Block 1 hangs from one end of string A. From there, string A runs over a massless and frictionless pulley, and the other end is connected to block 2. Block 2 slides over an inclined plane (with ordinary kinetic friction) as shown in Figure 1 above. The other side of block 2 is connected to string B which runs over a massless and frictionless pulley to connect with block 3. Block 3 slides with ordinary kinetic friction over a different inclined plane, also as shown in Figure 1. Question 3 1 pts This question also refers to the situation shown in Figure 1. Read this question carefully {especially the last paragraph]. Block 1 has a mass of 1.27 kg. Block 2 has a mass of 2.26 kg. Block 3 has a mass of 5.23 kg. The plane beneath block 2 is inclined at an angle of theta = (9 = 62.35 degrees away from vertical, as shown in Figure 1 above. The plane beneath block 3 is inclined at an angle of phi = (p = 18.97 degrees away from horizontal, also shown in Figure 1. The coefcient of kinetic friction between block 2 and the plane below it is 0.55. The coefcient of kinetic friction between block 3 and the plane below it is 0.41. Assume the only forces on the blocks are gravity (with g = 9.81 mfs2), normal forces from the planes, friction forces from the planes, and tension forces from the strings. Do not ignore friction. The velocity of block 1 points up {and the strings do not stretch]. The velocities of blocks 2 and 3 both point roughly to the right. Calculate the acceleration of block 1 in units of meters per second squared. The sign of your answer is important. A positive acceleration for block 1 still points down