A point charge +Q is located on the x axis at x = a, and a second point charge ?Q is located on the x axis at x = ?a. A Gaussian surface with radius r = 2a is centered at the origin. The flux through this Gaussian surface is
A. zero because the negative flux over one hemisphere is equal to the positive flux over the other.
B. greater than zero.
C. zero because at every point on the surface the electric field has no component perpendicular to the surface.
D. zero because the electric field is zero at every point on the surface.
E. none of the above.
Answer: A
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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 400-g block of iron at 400°C is dropped into a calorimeter (of negligible heat capacity) containing 60 g of water at 30°C
How much steam is produced? The latent heat of vaporization of water is 22.6 × 105 J/kg and its specific heat capacity is 4186 J/kg ? K. The average specific heat of iron over this temperature range is 560 J/kg ? K. A) 22 g B) 33 g C) 42 g D) 54 g E) 59 g
A radioactive isotope that emits a gamma quantum will change in what respect?
a. Atomic number increases by one. b. Atomic mass number decreases by one. c. Atomic number decreases by one. d. None of these choices are valid.
Vector quantities are represented in terms of their magnitude and direction
Indicate whether the statement is true or false