How can we see through the interstellar medium?
A) by observing in high-energy wavelengths such as x-rays and long wavelengths of light such as radio waves and infrared
B) by observing only the brightest visible sources
C) by using only the biggest telescopes
D) by using telescopes above the Earth's atmosphere
E) We cannot see through the interstellar medium.
A) by observing in high-energy wavelengths such as x-rays and long wavelengths of light such as radio waves and infrared
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A non-uniform, 80-g, meter stick balances when the support is placed at the 51.0-cm mark. At what location on the stick should a 5.0-g tack be placed so that the stick will balance at the 50.0 cm mark?
A) 16.0 cm B) 67.0 cm C) 66.0 cm D) 35.0 cm E) 34.0 cm
A gasoline engine absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle. The efficiency of the engine is
A. 80%. B. 40%. C. 60%. D. 20%. E. 50%.
The _______________ model explains pulsars using beams of radiation that sweep around the sky
Fill in the blank(s) with correct word
A white dwarf generates energy through fusion
a. True b. False Indicate whether the statement is true or false