Why is the cause of the acceleration of the universe called "dark energy"?
A) Dark energy and dark matter are just two forms of the same thing.
B) The term dark energy was the one that caught on with other astronomers.
C) We're pretty sure that whatever is causing the acceleration is pure evil.
B
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Polypropylene has _________strength at elevated temperatures than PE does.
Fill in the blank(s) with the appropriate word(s).
The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg
a.
6.0 N
b.
5.1 N
c.
5.5 N
d.
4.6 N
e.
3.7 N
The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. D E. C and D
A tiny device containing many transistors, diodes, and resistors is a(n) ________
Fill in the blank(s) with the appropriate word(s).