The birthplaces of stars correspond to the ________ clouds in the interstellar medium
Fill in the blank(s) with correct word
densest (and coldest)
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A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
a. 20 b. 60 c. 40 d. 80 e. 10
What is a "pulsating star"?
A. a star whose mass changes as it comes into contact with another star B. a rotating neutron star that emits radio waves in a narrow beam C. a star whose luminosity changes as it regularly expands and contracts D. a planetary nebula
Which one of the following quantities is at a maximum when an object in simple harmonic motion is at its maximum displacement?
a. speed b. acceleration c. kinetic energy d. frequency
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.