The greatest expansion of water among the following occurs when
A) it turns to ice.
B) at 4°C it gains thermal energy.
C) at 4°C it loses thermal energy.
D) none of the above
Answer: A
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Vision Problems: A nearsighted person has a near point of 12 cm and a far point of 17 cm. If the corrective lens is 2.0 cm from his eye, (a) what lens power will enable this person to see distant objects clearly, and (b) what then will be the new near point of his eye?
What will be an ideal response?
An advantage of a circuit breaker over a fuse is
A) not given. B) it is bigger. C) it is smaller. D) it costs more so it must be better. E) it is easier to re-enable the circuit.
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.
The observed distribution of matter in the Universe is best understood as being caused by ____
a. clumping of dark matter in the early Universe causing clumping of normal matter b. clumping of normal matter in the early Universe causing clumping of dark matter c. simultaneous clumping of normal and dark matter d. large variations in the intensity of the cosmic microwave background e. homogenous expansion of normal and dark matter