Refrigerator magnets are typically
A) short range.
B) long range.
C) none of these
Answer: A
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A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32 b. 0.45 c. 0.58 d. 0.19 e. 0.26
Suppose we imagine the Sun to be about the size of a grapefruit. How far away are the nearest stars (the three stars of Alpha Centauri)?
A) the length of a football field (100 meters) B) across town C) across the state D) across the United States E) 25,000 miles
A nuclear reaction starts with 1.71 MeV of kinetic energy and a rest energy of 28.2 GeV. If the reaction releases 1.10 MeV, what was the Q of the reaction?
A) 11.0 MeV B) 1.10 MeV C) 6.60 MeV D) 0.60 MeV E) 28.8 GeV
The star's color index is a quick way of determining its
A) density. B) mass. C) composition. D) temperature. E) luminosity.