The Saros cycle
a. was used in ancient times to predict eclipses.
b. is 18 years, 11 days long.
c. accounts for the tides seen on Earth.
d. was used in ancient times to predict eclipses and is 18 years and 11 days long,
e. None of the other choices are correct.
d
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A) is invisible. B) cools as it expands. C) both of these D) neither of these
A spring-driven dart gun propels a 10. g dart. It is cocked by exerting a force of 20. N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?
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The two types of reflection are ______________ and ___________
Fill in the blank(s) with correct word
A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = ?3.0 m. If Q = 50 ?C, what is the magnitude of the electrostatic force on a third point charge, ?Q, placed on the y axis at y = +4.0 m?
a. 2.5 N b. 3.0 N c. 3.7 N d. 4.4 N e. 1.8 N