1. You need to load a crate of mass m onto the bed of a truck. One possibility is just to lift the crate straight up over a height h, equal to height of the truck's bed. The force exert in this case is F] and the work done in this case is 171- The other possibility is to slide the crate up the frictionless ramp of length L as shown in the figure. In this case you exert force F2 and perform work W2. Which statement is true? A F1 > F2 and W1 > W2 B. F1 =F2 and W1 > W2 C. F1 = F2 and W1 = W2 D. F1 > F2 and W] < W2 E. F1 > F2 and W1 = W2 2. The human ear canal is much like an organ pipe that is closed at one end (at the tympanic membrane, or eardrum) and open at the other. Suppose that a person's ear canal is of length L=0.0277 m What is the fundamental frequency of the ear canal if the speed of sound is 343 m's? A. 1.3 kHz B. 3.8 kHz C. 1.8 kHz D. 3.1 kHz E. 2.8 kHz Page 13. The diagram shows a cube floating in a container of oil If D=20.0 cm, what is the density of the cube if d= 5cm? Poil = 0.9-83 = 900- d D A 1125 kg'm3 B. 675 kg/m3 C. 1575 kg/m3 D. 450 kg/m3 E. 225 kg/m3 4. If you drop an object from a height h above the ground, how long would it take for the object to reach a speed of 39 m's assuming that the object is initially high enough that it doesn't hit the ground first (neglect air resistance)? A 1.4 s B. 4.0 s C. 2.0 s D. 1.0 s E. 3.0 s Page 25. A block is connected to a spring and hung vertically. The block is set into motion and a short time later, a sequence of nme snapshots is recorded (the photos are taken at regular time intervals). These snapshots are arranged side-by-side below. Of the choices below, at what instant in time is the block experiencing the largest magnitude of the velocity? A t=2 B. t= 3 C. t=4 D. t= 6 E. t= 7 6. A violinist plays the note 'A' (frequency 440 Hz). This is the fundamental frequency for the string If the string is 15 cm long what is the wave speed on the string? A. 132 m's B. 264 m's C. 66 m's D. 343 m's E. We cannot determine this without knowing the tension on the string and its linear mass density. 7. A ball of mass 0.5 kg is dropped from rest at a point some distance above the ground. If the ball's kinetic energy just before it hits the ground is 25 J, from what height was the ball dropped? (Use g= 10 m/'s2) A. 1.0 m B. 50.0 m C. 5.0 m D. 0.5 m E. 4.0 m Page 3