A color of a star reveals its
A. Prism or A Diffraction Grating |
B. Annie Jump Cannon |
C. Temperature |
D. Spectroheliometer |
E. Continuous Spectrum |
F. Joseph Van Fraunhofer |
C. Temperature
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If R1 = 10 ?, R2 = 15 ?, R3 = 20 ?, and I = 0.50 A, at what rate is heat being generated in these resistors?
A. 29 W B. 16 W C. 22 W D. 11 W E. 1.1 W
Of all the active galactic nuclei, the ________ is the most energetic
A) quasar B) giant elliptical C) radio lobe galaxy D) blazar E) Seyfert
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
A. 83% B. 65% C. 43% D. 90% E. 56%
Erosion performed by flowing water alone is known as
A. weathering. B. abrasion. C. hydraulic action.