It appears that the universe is composed of nearly three times as much dark energy as normal and dark matter combined
Indicate whether the statement is true or false
TRUE
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What is Einstein's cosmological constant?
A) the value of the expansion rate of the universe B) the value of the acceleration of the universe C) the value that measures the strength of gravity across the universe D) the size of the cosmological horizon E) a repulsive force that counteracts gravity and was introduced to allow for a static universe
A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop would
A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four.
A conducting bar moves as shown near a long wire carrying a constant 50-A current. If a = 4.0 mm, L = 50 cm, and v = 12 m/s, what is the potential difference, VA ? VB?
a.
+15 mV
b.
?15 mV
c.
+20 mV
d.
?20 mV
e.
+10 mV
In a prolonged drought, groundwater is
A) unaffected—there is always water flowing underground. B) in danger of being diminished. C) safe from processes at the surface. D) completely gone.