Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)
A) N/m ? s2
B) kg/m2
C) kg ? m/s2
D) kg/m ? s2
E) kg ? m2/s2
D
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This photograph shows what appears to be four identical quasars arranged as a cross. What are we really seeing?
A) four images of a single quasar, with the images formed by gravitational lensing because a large galaxy lies between us and the quasar B) four quasars that are nearly identical because they were born at about the same time C) a picture taken with a poorly made telescope so that a single large object appeared as four fuzzy dots D) a large galaxy with four central masses that each glow brightly
A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
a. 30 N b. 45 N c. 80 N d. 8.9 N e. 13 N
Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied forces P1/P2 5 5/2, the ratio of the joint B reactions RB1/RB2 is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
A good tutor will be correct in saying that velocity and acceleration are
A) the same concept, but expressed differently. B) rates of one another. C) expressions for changing speeds. D) different concepts.