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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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.
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
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