1.) FTFTFT
 2.)  (1) 2-D projectile motion, force addition, wave intereference
       (2) work independent of path, work expressbale via potential energy, PE=mgh,0.5kx²
       (3) x-Theta, v-omega, a-alpha, F-tau, m-I
       (4) engine: Q_H in, W and Q_C out, refrigerator: Q_C and W in, Q_H out
 3.)  (a) 112.5m/s, 7.87m/s  (b) 3.91m  (c) 2^o
 4.)   56.9mph
 5.) (a) 2.54m/s², 1.17s  (b) 2.97m/s  (c) 2.66m/s
 6.) (a) -0.115m/s  (b) -0.0876J
 7.)  (a) -20.76Nm  (b) 1.7s
 8.) (a) 495N (b) 1617J, 3.27m
 9.) (a) 1.6m  (b) 71.25Hz  (c) 6.9dB