On the vernal equinox the Sun is
a. 23.4° north of the celestial equator.
b. 23.4° south of the celestial equator.
c. on the celestial equator and moving north with respect to the equator.
d. on the celestial equator and moving south with respect to the equator.
e. closest to the north celestial pole.
c
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Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
a. 41 J b. 16 J c. 64 J d. 10 J e. 80 J
Current: A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet. He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit 0.20 g of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol)
A. 9.1 mA B. 540 mA C. 33 A D. 1800 mA
Daytime high temperatures generally occur:
What will be an ideal response?
The distance to the Andromeda Galaxy is estimated at about 2 × 10^6 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 × 10^8 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 × 10^7 s)
a. 10 × 10^15 m c. 2 × 10^22 m b. 1 × 10^18 m d. 6 × 10^12 m