Which of the following statements is not an assumption used in models of galaxy formation?
A) The universe started out filled almost uniformly with hydrogen and helium.
B) Some regions in the universe were slightly more dense than others.
C) The universe is expanding.
D) Gas contracted to form the disks of galaxies before any stars were born.
C
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Observations from the Compton Gamma Ray Observatory showed that gamma-ray bursters were located throughout the sky. This told us that
a. the bursts were not produced among stars in the disk of our galaxy. b. the bursts were not produced among stars in the nuclear bulge of our galaxy. c. the bursts are not associated with planets in our solar system d. the bursts were not produced in our Sun e. All of the above
The two most abundant elements in the sun are
a. nitrogen and oxygen. b. hydrogen and helium. c. sulfur and iron. d. carbon and hydrogen. e. carbon and nitrogen.
Equilibrium: When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale. The weight of the car is equal to
A. the weight under the front wheels. B. the weight under the rear wheels. C. the average of the two weights. D. the sum of the two weights. E. the difference of the two weights.
Determine the rms voltage drop across the resistor in the circuit
a.
55 V
b.
77 V
c.
9.9 V
d.
5.5 V
e.
61 V