Einstein's special theory of relativity deals with objects that are
a. being hit by X-rays.
b. entering intense gravitational fields.
c. moving close to the speed of light.
d. being hit by energetic photons.
c
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What is the main consequence of forming jovian planets starting with extra mass from hydrogen compounds?
a. They captured more gas from interstellar space. b. They captured gas from the solar wind. c. They captured more mass from heavy bombardment. d. Their gravity became strong enough to attract hydrogen and helium gas from the solar nebula.
A power line carries 1000 A at a height of 20 m above the ground. What is the resulting magnetic field at ground level?
A. 50 mT
B. 0.13 mT
C. 13 
T
D. 10 
T
E. 5.0T
Solar activity cannot disrupt communications on Earth
Indicate whether the statement is true or false
The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.724 W/m2. What is the maximum value of the magnetic field in the wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 77.9 nT B) 55.1 nT C) 38.9 nT D) 108 nT E) 156 nT