Hubble's constant is related to the age of the universe, but the precise relationship depends on the way in which the expansion rate changes with time. For a given value of Hubble's constant (such as 22 km/s/Mly), the age of the universe is oldest if
A) the expansion rate has been increasing with time (an accelerating universe).
B) the expansion rate has remained nearly constant with time (a coasting universe).
C) the expansion rate slows ever more gradually with time (a critical universe).
D) the expansion rate is slowing enough that it will eventually reverse (a recollapsing universe).
A) the expansion rate has been increasing with time (an accelerating universe).
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The electric field between square the plates of a parallel-plate capacitor has magnitude E
The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The magnitude of the electric field between the plates is now equal to A) E/2. B) 2E. C) E/4. D) E. E) 4E.
Energy Conservation With Conservative Forces: Two frisky otters slide down frictionless hillsides of the same height but different slopes. The slope of the hill of otter 1 is 30°, while the slope of the hill of otter 2 is 60°. If both start from rest, which otter is moving faster when she reaches the bottom of her hill?
A. Otter 1 is moving faster. B. Otter 2 is moving faster. C. The heavier otter is moving faster, no matter which hill she used. D. Both otters have the same speed at the bottom. E. The otter that took the shorter time is moving faster.
A proton moving along the x axis has an initial velocity of 4.0 × 10^6 m/s and a constant acceleration of 6.0 × 10^12 m/s2 . What is the velocity of the proton after it has traveled a distance of 80 cm?
a. 5.1 × 10^6 m/s b. 6.3 × 10^6 m/s c. 4.8 × 10^6 m/s d. 3.9 × 10^6 m/s e. 2.9 × 10^6 m/s
A supercluster is a cluster of supergiants
Indicate whether the statement is true or false