A solenoid with 500 turns, 0.10 m long, carrying a current of 2.0 A and with a radius of 10-2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. 31 × 10^-4 T
c. 2.5 × 10^-2 T
b. 1.3 × 10^-2 T
d. 62 × 10^-4 T
B
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The assumption of homogeneity states that
a. the universe looks the same at all epochs. b. the universe looks the same from all locations over sufficiently great distances. c. the universe looks the same in all directions over sufficiently great distances. d. all of the above e. none of the above
Elastic Collisions: In the figure, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is
A. perfectly elastic. B. partially inelastic. C. completely inelastic. D. characterized by an increase in kinetic energy. E. not possible because momentum is not conserved.
Huyghens claimed that near the surface of the Earth the velocity downwards of an object released from rest, vy, was directly proportional to the square root of the distance it had fallen, 
. This is true if c is equal to
A.
.B.
.C.
D.
.E.
In a muggy region, the extra warmth you often feel is mainly due to
A) evaporation. B) condensation. C) sublimation. D) none of the above