The terrestrial planet with the most effective greenhouse effect is ____________________
Fill in the blank(s) with correct word
Venus
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Two identical concentric loops are arranged as shown in the diagram below. Loop 1 initially carries a steady current driven by the power supply shown. 
Suppose that when we turn off the power supply, it takes a small but finite time for the current to decay to zero in loop 1. In what direction does the current induced in loop 2 flow during this time interval?
A. Clockwise. B. Counterclockwise. C. No current flows in loop 2. D. One needs more information to answer.
A stars exhibit strong hydrogen absorption lines because the surface temperature of 10,000 K is high enough to place most hydrogen in an excited, but not yet ionized, state
The transitions from this excited state then correspond to visible light wavelengths. Which of the following statements is a plausible explanation for why G stars exhibit weak hydrogen absorption lines? A) G stars contain very little hydrogen. B) At these high temperatures, nearly all the hydrogen is ionized, and unable to interact with light. C) G stars are too cool to excite hydrogen atoms to the first energy level from which they can then absorb visible wavelengths of light.
An object 15 cm high is placed 15 cm in front of a convex mirror with a focal length of -10 cm. What is the image height (in cm)?
a. 2 b. 4 c. 6 d. 8 e. 30
A battery is rated at 12. V and 160. A ? h. How much charge does the battery store?
What will be an ideal response?