The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A) 1.1
B) 1.2
C) 1.4
D) 1.6
E) 1.8
C
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What is the magnitude of the angle of dip at Earth's magnetic north pole?
The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA ? VC, at t = 3.0 s?
a.
?7.2 V
b.
+7.2 V
c.
?4.8 V
d.
+4.8 V
e.
?12 V
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thick-ness t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
The amount of heat that flows through a rod whose ends are held at different temperatures is proportional to the area of the rod
Indicate whether the statement is true or false