If there is a net torque on a wheel, then
A. the wheel cannot be spinning.
B. the angular momentum of the wheel cannot change direction.
C. there must be a net force on the wheel.
D. the wheel must have a nonzero angular acceleration.
Answer: D
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Solid solution strengthening is _________with designs that require the part to be heated during fabrication by processes such as welding or hot working.
Fill in the blank(s) with the appropriate word(s).
Consider the function ? (x) = Ax 2 + B, where A and B are constants. Is this function a possible quantum wave function under the right circumstances?
A. Yes. B. Yes, but only for certain values of A and B. C. Yes, but only if A and B are complex. D. Yes, if B is zero. E. No.
Of all the stars in the sky, Barnard's star, the next closest beyond Alpha Centauri, appears to move the fastest
Indicate whether the statement is true or false
Name four properties of Mars that are similar to those of Earth today.
a. Magnetic field; average density; atmospheric chemical composition; active water erosion of the surface. b. Differentiated body; location in the Solar System; has weather and seasons; surface temperatures can be Earthlike. c. Differentiated body; location in the Solar System; atmospheric chemical composition; active water erosion of surface. d. Magnetic field; average density; has weather and seasons; surface temperatures can be Earthlike.