Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.10 s
What was the speed of the ball at as it passed the top of the flagpole? A) 6.40 m/s
B) 16.2 m/s
C) 17.6 m/s
D) 29.0 m/s
E) 33 m/s
C
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Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is
A) ejected into space in a solar wind. B) ejected into space by solar flares. C) converted to an amount of energy equal to 4 million tons times the speed of light squared. D) reabsorbed as molecular hydrogen.
If a solar eclipse occurs today when might you have a chance to see a lunar eclipse?
A. in 27 days B. in 11 days C. in 21 days D. in 15 days
The focal point of a lens is determined by
A. both shape and index of refraction. B. only the shape if you have a negative lens, otherwise only the index of refraction. C. the index of refraction of the lens material. D. the shape of the two surfaces of the lens.
Science is concerned mainly with the
A) natural world. B) spiritual world. C) difference between right and wrong. D) search for eternal truths.