Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation.
b. the history of past collisions.
c. the mass.
d. All of these may be important in determining a galaxy's shape
D
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If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results
a. a dark (absorption) line b. a bright (emission) line c. continuous
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and 4L1 = L2 c. 2r1 = r2 and 4L1 = L2 b. r1 = r2 and L1 = 2L2 d. 2r1 = r2 and L1 = 2L2
Four of the five answers listed below are characteristics of water. Select the exception
a. Water stabilizes temperature. b. Water is an excellent solvent. c. Water has cohesion and surface tension. d. Water produces salts. e. Water is less dense when solid.
A pole-vaulter holds out a 5.5kg, 4.75m pole horizontally in front of him. Assuming the pole is uniform in construction, and that he holds the pole with one hand at the very end, and one hand 0.75m from the end, what is the torque applied by the Earth to the pole?
A. 40N B. 88N C. Not enough information is given D. 128N