A sheet of graphite that is one atom layer thick is called _________.
Fill in the blank(s) with the appropriate word(s).
graphene
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A hollow aluminum shaft (G 5 27 GPa, d2 5 96 mm, and d1 5 52 mm) has an angle of twist per unit length of 1.8°/m due to torques T. The resulting maximum tensile stress in the shaft is approximately:
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(D) 58 MPa
A freely falling object
a. has a uniformly increasing velocity. b. is unaffected by gravity. c. has a uniformly increasing acceleration. d. has a uniformly increasing displacement.
Within cosmology, the critical density is
A. the density that determines whether the Universe expands forever or recollapses. B. the density of the Universe. C. the density of the most massive black hole in the Universe. D. the density of Universes in the multiverse. E. None of these choices is correct.
A heavy iron ball is placed in an aluminum pie pan that floats in a bucket. The water level at the side of the bucket is marked. Then the ball is removed and allowed to sink in the bucket. The water line at the side of the bucket
A) goes down. B) is the same. C) rises.