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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science