In twice the time, an object will fall
A) 16 times as far.
B) 12 times as far.
C) four times as far.
D) twice as far.
E) eight times as far.
C
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A projectile is thrown upward at 24° with the vertical and returns to the horizontal ground 12.5 s later with no air drag
(a) How fast was it thrown? (b) How far from its original position did it land? (c) How high above its original position did it go?
A 2 500-kg ore car rolls 55.0 m down a frictionless 10.0° incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.10 m?
a. 1.1E+5 kN/m b. 4.5E+5 kN/m c. 2.8E+6 kN/m d. 2.4E+5 kN/m e. 2.4E+4 kN/m
Index of Refraction: The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A. 1.1 B. 1.2 C. 1.4 D. 1.6 E. 1.8
The observed relationship of 1/500 between the masses of central black holes and the bulge masses of galaxies implies that
A) the black hole will eventually suck in the rest of the galaxy. B) galaxy formation and supermassive black hole formation must be related somehow. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.