Because the _______________ of the Moon and the Sun vary slightly, the disk of the Moon is sometimes too small to cover the disk of the Sun
Fill in the blank(s) with correct word
angular diameter
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A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A) 1.4 × 10-11 N B) 5.3 × 10-18 N C) 5.3 × 108 N D) 5.9 × 10-15 N
A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
A) zero B) 1.6 × 10-20 N C) 3.2 × 10-20 N D) 1.6 × 10-21 N E) 3.2 × 10-21 N
Why is the inner core solid even though it is hotter than the outer liquid core?
A. The dynamo effect causes ions in Earth's interior to become solid. B. The great pressure at Earth's center forces the atoms in the core together, causing it to solidify. C. Radioactivity causes liquid materials to become solid. D. This is not unusual: hotter things tend to be more solid.
You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45° b. 23.4° c. 39° d. 51° e. The answer depends on the day of the year.