Knowledge of a star's temperature and ________ enables us to calculate its radius, surface area, and volume from the appropriate radiation law
Fill in the blank(s) with correct word
luminosity or absolute magnitude
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A ten billion year old globular cluster has every star evolved into a giant, with no main sequence stars left
Indicate whether the statement is true or false
A 80. volt DC motor draws 4.0 A at its operating speed of 1500. rpm with an armature resistance of 4.0 ?
(a) What is the starting current? (b) What is the back emf when running normally? (c) What series resistance could be added to limit the starting current to 10. A?
Which of the following is NOT a true statement about the relationship between the thermal expansion of a solid and the potential energy of an ion in a solid?
Consider a capacitor connected across the ac source. As the capacitance is increased, the current through the capacitor will
A) increase. B) remain constant. C) decrease.