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. The required ratio of the applied forces P1/P2 so that joint B rotations ?B1 and ?B2 are equal is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
(D) 2
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A 0.20-m-long metal rod has a radius of 3.0 cm and a resistance of 2.5 × 10^?5 ?. What is the resistivity of the metal?
a. 1.1E–8 ??m b. 3.5E–7 ??m c. 1.0E–8 ??m d. 1.8E–8 ??m e. 1.2E–7 ??m
Coulomb's Law: Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC. Which one of the following statements is true about the magnitudes of the electric forces on these beads?
A. The force on A is 10 times the force on B. B. The force on B is 10 times the force on A. C. The force on A is exactly equal to the force on B. D. The force on A is 100 times the force on B. E. The force on B is 100 times the force on A.
The seriousness of an asteroid collision is gauged by the ______________ scale
Fill in the blank(s) with correct word
The magnetic pole of the Earth nearest the geographic South Pole corresponds to which of the following?
a. a magnetic south pole c. a magnetic north pole b. a magnetic Antarctic pole d. a magnetic arctic pole