A titanium bar (E 5 100 GPa, v 5 0.33) with square cross sec-tion (b 5 75 mm) and length L 5 3.0 m is subjected to tensile load P 5 900 kN. The increase in volume of the bar is approximately:
(A) 1400 mm3
(B) 3500 mm3
(C) 4800 mm3
(D) 9200 mm3
(D) 9200 mm3
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Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
A) It does not change. B) It decreases. C) It could either increase or decrease. D) It increases.
A 400-m tall tower casts a 600-m long shadow over level ground. At what angle ? is the sun elevated above the horizon?
A) 33.7° B) 41.8° C) 48.2° D) 65.1° E) Can't be found; not enough information.
The total amount of power (in watts, for example) that a star radiates into space is called its ________
A) apparent brightness B) flux C) absolute magnitude D) luminosity