Light in air enters a diamond (n = 2.42) at an angle of incidence of 60.0°. What is the angle of refraction inside the diamond?
a. 45.6°
c. 17.9°
b. 24.7°
d. 21.0°
D
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In one particular case, the limiting angle of resolution for an eye is 1.4 × 10-4 rad. What is the minimum separation between two point sources of light that the eye can distinguish if they are at a distance of 40 m from the observer?
A) 2.8 mm B) 5.6 mm C) 1.4 mm D) 8.4 mm E) 4.7 mm
On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
A generator coil rotates through one revolution 60 times each second. The frequency of the emf is
A) 120 Hz. B) 60 Hz. C) 60 Hz. D) 30 Hz. E) (60/ ) Hz.
A 7.8-kg solid sphere, made of metal whose density is 2500 kg/m3, is suspended by a cord. When the sphere is immersed in water (of density 1000 kg/m3 ), what is the tension in the cord?
A) 46 N B) 61 N C) 76 N D) 92 N E) 110 N