2.9x107 is the same as
a. 2.9 thousand
b. 29 thousand
c. 290 thousand
d. 2.9 million
e. 29 million
E
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
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A. four B. three C. two D. one