At what speed is the mass of an electron double its rest mass?
A) 0.500c
B) 0.650c
C) 0.707c
D) 0.866c
E) 0.960c
D
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Which of the following is true of Population II stars?
A) They are located in the disk component of the galaxy. B) They have randomly tipped orbits with a wide range of shapes. C) They have higher metal content than Population I stars. D) They are post-main sequence stars.
Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack. B) half as much as the 25-kg sack. C) the same. D) need more information
Which ball will bounce higher off a hard surface?
A) a common rubber ball B) a steel ball C) both the same
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
A. 72 ?T B. 48 ?T C. 24 ?T D. 96 ?T E. 32 ?T