The _____ is a band centered on the ecliptic and encircling the sky
A) nadir
B) zodiac
C) horizon
D) zenith
B
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A 0.5 kg fish, hooked as shown below, starts to swim away at a speed of 3 m/s. The angular momentum of the fish relative to the hand holding the fishing rod is about
A.
.B.
.C.
.D.
.E.
.The proton storms in the solar wind travel at almost the speed of light
Indicate whether the statement is true or false
When an LRC series circuit is at resonance, which one of the following statements about that circuit is accurate? (There may be more than one correct choice.)
A) The reactance due to the inductor and capacitor has its maximum value. B) The reactance of the capacitor is zero. C) The current amplitude is a maximum. D) The reactance of the inductor is zero. E) The impedance has its maximum value.
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