An 800-kHz sinusoidal radio signal is detected at a point 6.6 km from the transmitter tower
The electric field amplitude of the signal at that point is 0.780 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the amplitude of the magnetic field of the signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A)
A) 1.6 nT B) 3.1 nT C) 3.6 nT D) 2.1 nT E) 2.6 nT
E
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Which of the following statements about the disk of the Milky Way is generally true?
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Which force listed does not actually act on the crate?
A. 
B. 
C. Both and (which are equal)
D. 
E. 
It used to be thought that both of Mars' moons were captured asteroids. Information from Mars Express and Mars Global Surveyor has led to the conclusion that Phobos may have formed by a different process. Briefly describe that process
What will be an ideal response?
In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant. e. the process is reversible.