If the speed of light through an unknown liquid is measured at 1.78 × 10^8 m/s, what is the index of refraction of this liquid? (c = 3.00 × 10^8 m/s)
a. 0.593
b. 1.69
c. 2.84
d. 1.30
e. 1.59
b
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An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
A person uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the angular magnification if the person's eye is relaxed and has a near point of 25 cm?
A) 4.0 B) 5.0 C) 6.0 D) 7.0
If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie
a. 1400 b. 25,000 c. 50,000 d. 170,000 e. This cannot be determined without knowing how many reels were used.
An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm
If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates? A) 100 N/C downward B) 100 N/C upward C) 40000 N/C upward D) 40000 N/C downward