A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current
A) points directly away from you.
B) circles the wire in a clockwise direction.
C) points to the left.
D) circles the wire in a counter-clockwise direction.
D
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Why is it better to search for extrasolar planets directly using infrared (IR) rather than visible radiation?
A) the planet doesn't reflect any visible radiation, only IR radiation B) the star doesn't emit any IR radiation because it is too hot C) the visible light from planets will be blocked by interstellar dust along our line of sight while the IR radiation will not D) the planet emits more IR radiation than it reflects in the visible
A lab student drops a 400.0-g piece of metal at 120.0°C into a cup containing 450.0 g of water at 15.0°C. After waiting for a few minutes, the student measures that the final temperature of the system is 40.0°C
What is the specific heat of the metal, assuming that no significant heat is exchanged with the surroundings or the cup? The specific heat of water is 4186 J/kg ? K. A) 1470 J/kg ? K B) 2830 J/kg ? K C) 3420 J/kg ? K D) 3780 J/kg ? K E) 4280 J/kg ? K
The vast flood deposits support the hypothesis that Mars once had much running water. Assuming that Mars did have water once, what happened to it?
What will be an ideal response?
What are the 2 types of reflection discussed in chapter 18?
A. Diffuse and specular B. Point and specular C. Diffuse and scattered D. Scattered and specular