The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. A
B. B.
C. C.
D. D.
E. E.
Answer: E
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Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only once.
1. Our solar system was created by the gravitational collapse of the ________. 2. Our Moon was most likely formed by a collision between Earth and a Mars-sized _____. 3. The first few hundred million years of the solar system's history were the time of the _____, during which Earth suffered many large impacts. 4. Mars was formed by the ____ of smaller objects. 5. The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar space by the _____. 6. Ice can form from a gas through the process of _____. 7. Hydrogen compounds in the solar system can condense into ices only beyond the _______. 8. _______ allows us to determine the age of a solid rock.
How can the age of a star cluster be found from its H-R diagram?
What will be an ideal response?
Which of the following does not describe a method of achieving polarization?
1.Light hits a reflective surface at a particular angle, dependent on wavelength and index of refraction. The light which reflects is polarized in one direction, and the light which is transmitted is polarized perpendicular to the reflected light. 2.Unpolarized light encounters material made of parallel long-chain molecules. The portion of the light in line with the chains is transmitted; the rest is absorbed. 3.Light collides with air or other gas molecules, which absorb the energy. Electrons inside the molecule begin to vibrate, emitting polarized light much like a radio antennae. 4.Light is sent through an optically active material.
To prevent injuries, people should do all of the following EXCEPT _______
Fill in the blank(s) with the appropriate word(s).