To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s
How high is the pole above the point where the ball was launched? (You can ignore air resistance.) A) 10 m
B) 13 m
C) 16 m
D) 18 m
E) 26 m
A
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Galileo's observations of a complete set of phases of Venus proved
a. that Venus orbited the Sun. b. that Earth orbited the Sun. c. that all of the planets orbited the Sun. d. that the Moon orbited Earth. e. that Venus had an atmosphere.
You make a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how long will the trip take, according to you?
t' = t A) 2.8 years B) 10 years C) 28 years D) 280 years E) 2000 years
In an X-ray diffraction experiment using X-rays of l = 0.500 × 10^-10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing
a. 2.87 × 10^-10 m b. 1.36 × 10^-10 m c. 6.24 × 10^-9 m d. 1.93 × 10^-9 m e. 5.74 × 10^-9 m
Process of Science: Name a testable hypothesis of nebular theory that was shown to be false in observations of extrasolar planets. Must we throw out the theory and start from scratch, i.e
, is the observation completely inconsistent with a nebular formation?