A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground?
A) 20.0 m/s
B) 6.26 m/s
C) 12.5 m/s
D) 19.6 m/s
E) 21 m/s
B
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If the number of turns is tripled for an inductor of fixed length and fixed cross-sectional area, what happens to its inductance?
A. it stays the same B. it triples C. it becomes 9 times the original value D. it decreases by a factor of 3 E. it decreases by a factor of 9
In the 1960s, Maarten Schmidt determined that quasars were very distant objects by
A) determining how luminous they were. B) determining how small the source of light was from its variations in luminosity. C) discovering that they were embedded in distant galaxies. D) determining their redshifts. E) determining their parallax angles.
The _____ of an object is a measure of the amount of matter in the object
A) weight B) mass C) height D) velocity
If 2.0 kg of water at 0°C is to be vaporized, how much heat must be added?
A) 1080 cal B) 1080 kcal C) 1140 cal D) 1280 cal E) 1280 kcal