The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?
A) It is increased by a factor of 2.
B) It is increased by a factor of 4.
C) It is reduced by a factor of 2.
D) It is reduced by a factor of 4.
E) It does not change.
E
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Satellite Motion: Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a small moon, which has been named Dactyl. From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 1016 kg, and the distance between Dactyl and Ida is approximately 90 km. Assuming a circular orbit, what would be the orbital speed of Dactyl? (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.8 m/s B. 11 m/s C. 2.3 m/s D. 2.9 m/s E. 30 m/s
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 rotations ?B1/?B2 is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
A block of Styrofoam floats on water while a lead block of the same size block lies submerged in the water. The buoyant force is greatest on the
A) lead. B) Styrofoam. C) same for both
A grating has 5150 lines per centimeter ruled on it
What is the angular separation between the first- and the third-order bright spots on the same side of the central maximum when the grating is illuminated by a beam of light with wavelength 633 nm?