The Copernican model of the solar system has the planets orbit the sun along elliptical paths
Indicate whether the statement is true or false
F
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Intensity: 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. 2.6 nT B. 2.1 nT C. 1.6 nT D. 3.1 nT E. 3.6 nT
How necessary is soap for removing salt from your hands?
A) Soap is necessary because it has both a polar and nonpolar end to interact with the positive and negative ions in the salt. B) Soap is necessary because it creates a film on the surface of your skin, shielding it from interacting with the ionic charges of the salt. C) Soap is not at all necessary for removing salt from your hands. The strong ion-dipole interactions between fresh water and the salt are most sufficient to lift the salt away from your hands. D) Soap is not necessary because there are no electrical charges on the skin of your hands for the salt to interact with.
Special relativity is most concerned with
1) uniform motion, 2) accelerated motion, 3) the warping of space-time, 4) gravitation, whereas general relativity is more concerned with 5) uniform motion. 6) accelerated motion. 7) energy and mass. 8) time.
What is the unified model of active galactic nuclei? How does it explain differences in the continuous spectrum and emission lines of an active galactic nucleus?
What will be an ideal response?