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

Physics & Space Science

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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

Physics & Space Science

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?

Physics & Space Science

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.

Physics & Space Science

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?

a. The potential energy curve for an ion in a solid is not symmetric about the minimum energy point. b. The ions within the solid both attract and repel other ions in the solid. c. As the temperature increases from zero, ions begin to oscillate with potential energy like that of a simple-harmonic oscillator. d. The Pauli exclusion principle provides some repulsion for electron shell overlap.

Physics & Space Science