in the rest frame of the bar?
A. The force is purely electric.
B. The force is purely magnetic.
C. The force is both electric and magnetic.
D. There is no force on the bar’s electrons in this frame.
A. The force is purely electric.
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A force of 451 N is applied to 111 kg box that has a coefficient of static friction of 0.450. What is the force of friction on the box?
A. 490 N B. 0.00 N C. 108 N D. 451 N E. 203 N
On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, how long has human civilization (i.e., since ancient Egypt) existed?
A) about half the year B) about a month C) a few hours D) a few seconds E) less than a millionth of a second
The Dawn spacecraft entered into orbit around Ceres in
A) 2008. B) 2012. C) 2015. D) 2016.
The rate of heat flow by conduction through a slab does NOT depend upon the:
A. temperature difference between opposite faces of the slab B. thermal conductivity of the slab C. slab thickness D. cross-sectional area of the slab E. specific heat of the slab