The primary evidence for an accelerating Universe comes from observations of young stars in the Milky Way.
A.) True, observations show that there were many more young, massive stars in the early Universe.
B.) True, massive star supernovae allow us to measure the expansion rate of the Universe.
C.) False, in order to measure accelerating expansion, we need to measure the distances of objects billions of light-years away.
D.) False, evidence for an accelerating Universe comes from observations of the oldest stars in the Milky Way, white dwarfs.
E.) False, we have to look at young stars in other galaxies beyond the Milky Way to measure the acceleration of the Universe.
Ans: C.) False, in order to measure accelerating expansion, we need to measure the distances of objects billions of light-years away.
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Three resistors having resistances of 4.0 ?, 6.0 ?, and 10.0 ? are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-? resistor, what is the current through the 10.0-? resistor?
A) 0.59 A B) 2.7 A C) 6.4 A D) 11.2 A E) 16 A
If we place living cells in a nonpolar solvent like methane or ethane,
A) their membranes will thicken, preventing molecular transport across the membrane B) they will rapidly explode due to pressure caused by the solvent building up inside the cell C) their membranes will most likely dissolve as cell membranes are also nonpolar D) they will function in much the same way as they do in water
If an average molecule diffuses to a displacement of 4 cm in 5 s, how long would it take for such a molecule to diffuse to a displacement of 16 cm?
a. 10 s c. 36 s b. 20 s d. 80 s
Neglecting all types of friction, if two identical sleds, one empty and the other with four heavy passengers, start sliding down a hill together, the heavier sled will get to the bottom
1) before the empty car, 2) after the empty car, 3) at the same time as the empty car, while in the presence of air resistance, the heavier car will get to the bottom 4) before the empty car. 5) after the empty car. 6) at the same time as the empty car.