The first successful landers on the surface of Mars were:
A) Mariners 4 and 5 in 1965.
B) Vikings 1 and 2 in 1976.
C) Voyagers 1 and 2 in 1979.
D) Pathfinder and Sojourner in 1997.
E) Spirit and Opportunity in 2004.
B
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A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
a. Gertie, because the maximum voltage is determined by the battery. b. Gertie, because the capacitance of the capacitor does not change. c. Leah, because the capacitance decreases when the plate separation is increased. d. Leah, because the capacitance increases when the plate separation is increased. e. Neither, because the charge increases when the plate separation is increased.
A block slides down a frictionless inclined ramp and experiences no significant air resistance. If the ramp angle is 17
0° above the horizontal and the length of the surface of the ramp is 20m find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. A) 7.57 m/s B) 19.6 m/s C) 114 m/s D) 10.7 m/s
An absorption _________is the sharp increase in absorption that occurs when the energy of a photon is sufficient to excite an electron from one energy level to another.
Fill in the blank(s) with the appropriate word(s).
Kepler's 3rd law says T2 /r3 = K. What does the constant K depend upon?
A) period B) frequency C) size D) mass E) temperature