An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free body force diagram for the airplane?
A. Figure 1
B. Figure 2
C. Figure 3
D. Figure 4
E. Figure 5
B. Figure 2
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Two speakers are emitting coherent sound waves at a frequency of 440 Hz. If the speed of sound is 343 m/s, and it is observed that no sound is heard a distance of 17.2 m from one speaker, which of the following is a possible distance to the second speaker?
A. 14.6 m B. 17.2 m C. 19.6 m D. 18.8 m E. 16.5 m F. 18.0 m
The existence of the neutrino was postulated to account for which basic conservation laws during the beta decay process?
a. conservation of energy b. conservation of momentum c. Both choices a and b are valid. d. None of the above choices are valid.
The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the moment of inertia of this molecule about its center of mass?
A) 1.5 x 10-47 kg? m2 B) 1.9 x 10-47 kg? m2 C) 9.1 x 10-48 kg? m2 D) 4.6 x 10-48 kg? m2 E) 2.3 x 10-48 kg?v
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror:
a. depends on both the height of the man and the distance from the man to the mirror. b. is equal to the height of the man. c. is equal to one-half the height of the man. d. depends on the distance the man stands from the mirror.