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?
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.
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?