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%.
b
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Coulomb's Law: Two tiny particles having charges of +5.00 ?C and +7.00 ?C are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm, and the other particle is at x = 100.00 cm. Where on the x-axis must a third charged particle be placed so that it does not experience any net electrostatic force due to the other two particles?
A. 4.58 cm B. 45.8 cm C. 50 cm D. 9.12 cm E. 91.2 cm
In what part of the spectrum are starburst galaxies brightest? Remember: Starbursts are dusty. What does dust do?
A.) X-ray. B.) Ultraviolet. C.) Visible. D.) Infrared. E.) Radio.
Karl Schwarzschild did all but one of the following during his relatively short life. Which one?
Which of the following is(are) believed to be material that never collected into a single planet?
a. Asteroids b. Meteoroids c. Comets d. Interplanetary dust