To make an uncharged object have a negative charge we must:
A) add some atoms
B) remove some atoms
C) add some electrons
D) remove some electrons
E) write down a negative sign
C) add some electrons
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What happens when you drop a clock into a black hole?
A. The clock appears to be advancing at its normal rate both from the point of view of an outside observer and from the point of view of an observer falling with the clock. B. The clock appears to be advancing rapidly from the point of view of an outside observer, but normally for an observer falling with the clock. C. The clock appears to be advancing slowly from the point of view of an outside observer, but normally for an observer falling with the clock. D. The clock appears to be advancing slowly both from the point of view of an outside observer and from the point of view of an observer falling with the clock. E. The clock appears to be advancing rapidly both from the point of view of an outside observer and from the point of view of an observer falling with the clock.
In the eighteenth and nineteenth centuries, the rare transits of ________ were critical in determining the astronomical unit's length
Fill in the blank(s) with correct word
If the resultant force acting on a 2.0-kg object is equal to 
N, what is the change in kinetic energy as the object moves from 
m to
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A car traveling at a steady 20 m/s rounds an 80-m radius horizontal unbanked curve with the tires on the verge of slipping
What is the maximum speed with which this car can round a second unbanked curve of radius 320 m if the coefficient of static friction between the car's tires and the road surface is the same in both cases? A) 160 m/s B) 80 m/s C) 70 m/s D) 40 m/s E) 30 m/s