What is the charge on 1.0 kg of protons? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 1.0 C
B) 1000 C
C) 9.6 × 107 C
D) 6.0 × 1026 C
E) 6.0 × 1023 C
C
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An 800-kHz radio signal is detected at a point 9.1 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.440 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 average total power radiated by the transmitter? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 0.27 MW B) 0.32 MW C) 0.38 MW D) 0.45 MW E) 0.50 MW
How are jets thought to be produced by active galaxies?
What will be an ideal response?
An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?
A) 4T B) 2T C) T D) T/2 E) T/4
Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384 000 km and the mass of the Moon is 7.35 × 10^22 kg