When three vectors are added graphically and form a closed triangle, the largest enclosed angle between any two of the vectors cannot be greater than:
a. 60°.
c. 180°.
b. 90°.
d. No maximum exists.
C
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Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure). P is closest to
A) 25 N. B) 125 N. C) 187.5 N. D) 245 N. E) 1225 N.
Assume that the tile vectors for tiles on the surface shown below point toward us. What is the sign of the current i that flows through this surface?
A. The signed current i is positive.
B. The signed current i is negative.
C. The signed current i is zero.
D. One cannot determine i’s sign from what is given.
Standing waves are produced by the superposition of two waves with
A. the same amplitude, frequency, and direction of propagation. B. the same amplitude, frequency, and opposite direction of propagation. C. the same amplitude, different frequencies, and opposite direction of propagation. D. the same amplitude, different frequencies, and same direction of propagation.
The spectra of interstellar gas clouds show that they have the same basic composition as
A) Earth's atmosphere. B) stars. C) asteroids. D) interstellar dust. E) the Martian polar caps.