At what rate would the current in a 100-mH inductor have to change to induce an emf of 1000 V?
A)
100 A/s
B)
1 A/s
C)
1000 A/s
D)
10,000 A/s
E)
10 A/s
D
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Which of the following is true of Claudius Ptolemy?
A) He was interested in philosophical rather than practical questions about the Universe. B) For him, first principles took second place to accuracy. C) He believed that Earth was at the exact center of the Universe. D) He disagreed completely with Aristotle's ideas of the Universe.
Where did helium come from the early Universe?
A. The early Universe was so hot and dense that fusion of protons (hydrogen) into helium could occur. B. Photons bombarded hydrogen atoms and broke them up into helium atoms. C. Helium was formed in the cores of stars formed in the early Universe. D. Helium was not formed in the early Universe, because only neutrons were present.
H II regions are usually found isolated from other stars or types of nebulae
Indicate whether the statement is true or false
A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
a. 6.0 m/s b. 7.0 m/s c. 4.5 m/s d. 8.0 m/s e. 5.5 m/s