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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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.
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