Waves travel along a 100-m length of string which has a mass of 55 g and is held taut with a tension of 75 N. What is the speed of the waves?
A) 3700 m/s
B) 370 m/s
C) 37 m/s
D) 0.37 m/s
E) 3.7 m/s
B
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Which of the following materials would you predict to be ductile at 50 K?
(a) Pure BCC iron (b) Pure FCC copper (c) Pure HCP titanium (d) PE
As a tile falls from the roof of a building to the ground its momentum is conserved
A) True B) False
A 0.250-kg stone is attached to an ideal spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the spring constant of the spring?
A) 2.45 N/m B) 12.1 N/m C) 24.1 N/m D) 0.102 N/m E) 0.610 N/m
Which of the following best describes the meaning of declination and right ascension?
A) They are coordinates on the celestial sphere that are very similar to the coordinates of altitude and direction on Earth. B) They are used to describe the locations and distances of stars that we see in the night sky. C) They are coordinates on the celestial sphere, with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the vernal equinox. D) They are terms used by astronomers to describe how the sky changes with the seasons.