Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then
A. the strength of the electrical force on both decreases.
B. the electric field points toward the larger charge.
C. the electric field at the position of the smaller charge increases.
D. the larger charge feels a stronger electrical force and the other a weaker electrical force.
Answer: C
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A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the heads is approximately:
(A) 19 MPa
(B) 23 MPa
(C) 33 MPa
(D) 35 MPa
It is difficult to use light from distant galaxies to compute the true physical distance to those galaxies today because the Universe has expanded since it was emitted.
Answer the following statement true (T) or false (F)
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
a. the speed of radio waves. b. the speed of light. c. the speed of gamma rays. d. all of the above. e. only (a) and (b) above.
Another term for a spreading center is
A) convergent boundary. B) divergent boundary. C) transform fault boundary. D) none of the above.