What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly?
The earth's orbit has a mean radius of 1.5 108 km, and 1 ly = 9.46 1015 m.
A) 1.2 10-7 degrees B) 2.1 10-7 degrees
C) 1.2 10-14 degrees D) 2.1 10-4 degrees
Question 2
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb?
(0 = 8.85 10-12 C2/N m2, 0 = 4 10-7 T m/A, c = 3.00 108 m/s)
A) 162 N/C B) 52.9 N/C C) 212 N/C D) 150 N/C E) 82.1 N/C
Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
Alpha Centauri A and B over limb of Saturn
Changes in Earth’s Orbit
Geothermal energy and powers Earth’s systems
Changing Sun Angle
Calculate the distance from point R(17,5) to the line ... Round to the nearest tenth of a