To see his full height, Blinky Bill who is 1 meter tall needs a mirror that is at least
A) 0.33 m tall.
B) 0.50 m tall.
C) 0.75 m tall.
D) 1 m tall.
E) depends on distance from the mirror.
Answer: B
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A. 200 N B. 120 N C. 160 N D. 150 N E. 0 N
A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum stress in the heads of the tank is approximately:
(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa
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A) less than 10 J. B) 10 J. C) more than 10 J. D) none of the above
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