If a galaxy is moving away from us at 1.0% of the speed of light, use Hubble's law to estimate how far away it is from us if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 140 ly
B) 14 ly
C) 140 thousand ly
D) 140 million ly
E) 140 billion ly
D
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If the relative magnetic permeability of a material is equal to 0.99999, this material is
(a) Diamagnetic. (b) Paramagnetic. (c) Ferromagnetic. (d) Antiferromagnetic.
Coulomb's Law: An asteroid of mass 58,000 kg carrying a negative charge of 15 ?C is 180 m from a second asteroid of mass 52,000 kg carrying a negative charge of 11 ?C. What is the magnitude of the net force the asteroids exert upon each other, assuming we can treat them as point particles? (G = 6.67 × 10-11 N ? m2/kg2, k = 1/4 ??0 = 8.99 × 109 N ? m2/C2)
A. 0.000040 N B. 0.0062 N C. 570,000 N D. 510,000 N
The critical angle is given by sinc (1/n1 ) for what condition?
What will be an ideal response?
The excess charge on this sphere is closest to
A) 700 nC. B) 79 nC. C) 0.35 nC. D) 315 nC. E) 350 nC.