For the wave described by y = 0.02 sin (kx) at t = 0 s, the first maximum at a positive x coordinate occurs where x = 4 m. Where on the positive x axis does the second maximum occur?
a. 20 m
b. 18 m
c. 24 m
d. 28 m
e. 16 m
a
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Two point charges of +20.0 ?C and -8.00 ?C are separated by a distance of 20.0 cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) 25.2 × 106 N/C directed toward the negative charge B) 25.2 × 106 N/C directed toward the positive charge C) 25.2 × 105 N/C directed toward the negative charge D) 25.2 × 105 N/C directed toward the positive charge E) 25.2 × 104 N/C directed toward the negative charge
What is the "center of mass"?
a. The exact middle of any object, measured from all its edges. b. The location that the object would concentrate to if we imagined it to shrink to a point. c. An arbitrarily chosen point in the object used to describe its motion. d. A point in space that the object is moving toward. e. A point in space to which an object is attracted.
The force required to maintain a constant velocity for an astronaut in free space is equal to
A) zero. B) the mass of the astronaut. C) the weight of the astronaut. D) the force required to stop the astronaut. E) none of the above
According to the authors of the text, the theory of relativity
A) does not violate our common sense. B) violates common sense because it contradicts logic. C) violates common sense because it is counterintuitive. D) violates common sense because the theory contradicts itself in many cases. E) violates common sense because it is full of paradoxes.