If the orbit of the Moon carries it through the umbra of Earth's shadow, you see a__________
A) total solar eclipse
B) partial lunar eclipse
C) partial solar eclipse
D) total lunar eclipse
D
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Density: The density of material at the center of a neutron star is approximately 1.00 × 1018 kg/m3. What is the mass of a cube of this material that is 1.76 microns on each side. (One micron is equal to 1.00 × 10-6 m.)
A. 5.45 kg B. 4.74 kg C. 6.16 kg D. 6.70 kg
For total internal reflection to take place, light must go from a medium of lower index of refraction to a medium of higher index of refraction
Indicate whether the statement is true or false
An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower
The electric field amplitude of the signal at that point is 0.80 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 intensity of the radio signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 4.2 × 10-4 W/m2 B) 1.7 × 10-3 W/m2 C) 8.5 × 10-4 W/m2 D) 1.2 × 10-3 W/m2 E) 6.0 × 10-4 W/m2
A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
a. 9.9 s b. 7.8 s c. 8.5 s d. 9.2 s e. 6.4 s