Why is there a lower end in the main sequence of the H-R diagram?
What will be an ideal response?
The lower end in the main sequence show objects that are less massive, stars less than 0.08 solar masses cannot get hot enough in their cores to ignite hydrogen fusion. These brown dwarfs cannot ignite hydrogen, so they contract slowly, convert their gravitational energy into thermal energy, and radiate it away.
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Which of the following best describes the property of the period of orbital revolution for an Earth satellite?
a. greater when the orbital radius is smaller b. greater when the orbital radius is larger c. independent of the orbital radius d. determined mainly by the satellite's mass
Describe how Eratosthenes first measured the size of Earth over 2000 years ago
What will be an ideal response?
Determine the potential difference, VA ? VB, in the circuit segment shown below when I = 2.0 mA and Q = 50 ?C
a.
?40 V
b.
+40 V
c.
+20 V
d.
?20 V
e.
?10 V
As frequency is varied in an RLC series circuit, resonance is reached when
A. the impedance becomes zero. B. the inductive reactance is equal to the capacitive reactance. C. the sum of the inductive and capacitive reactances is equal to the resistance. D. the capacitive reactance is equal to the resistance. E. the inductive reactance is equal to the resistance.