A rectangular beam with semicircular notches has dimensions h 5 160 mm and h1 5 140 mm. The maximum allowable bending stress in the plastic beam is ?max 5 6.5 MPa, and the bending moment is M 5 185 N?m. The minimum permissible width of the beam is:
(A) 12 mm
(B) 20 mm
(C) 28 mm
(D) 32 mm
(B) 20 mm
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The three common phases of matter on Earth are ________, ___________, and _______
Fill in the blank(s) with correct word
When the discharge of a stream increases, what happens to stream speed?
What will be an ideal response?
A pair of identical balls is connected by a massless rod, and thrown straight up into the air, such that the center of mass of the pair reaches a maximum height of 13.2 m above the point of release. On the way up, when the center of mass is at 6.6 m above to point of release, the velocity of one ball is measured to be 7.7 m/s downward. What is the velocity of the other ball at this time? Ignore air resistance.
A. 19.1 m/s up B. 3.7 m/s up C. 8.0 m/s up D. 0.3 m/s up E. 0.3 m/s down F. 3.7 m/s down
A 1056-hertz tuning fork is struck at the same time as a note on the piano and you hear 2 beats/second. You tighten the piano string very slightly and then hear 3 beats/second. What is the frequency of the piano string?
A) 1053 hertz B) 1054 hertz C) 1056 hertz D) 1058 hertz E) 1059 hertz