Which of the following claims about the very first stars in the universe would be impossible given our basic picture of the history of the universe?
A) Many of them have exploded as supernovae by now.
B) Some of them formed in large clusters.
C) Some of them formed in isolation from one another.
D) Some may have left behind neutron stars or black holes that still exist in the Milky Way today.
E) Some of them had rocky planets around them as they formed.
E) Some of them had rocky planets around them as they formed.
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Power: An ac signal is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the frequency of the ac signal?
A. 160 Hz B. 200 Hz C. 410 Hz D. 600 Hz E. 910 Hz
A typical supercluster contains no more than about 10,000 stars
Indicate whether the statement is true or false
An ideal spring with a spring constant of is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 93 J B) 186 J C) 47 J D) 121 J
Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?