Regarding the energy efficiency of incandescent and fluorescent bulbs,
A) incandescent is more efficient because the electric current heats the wire filament directly.
B) incandescent is more efficient because it uses electric current, which is a highly efficient energy form.
C) fluorescent is more efficient because it does not use an actual electric current (a flow of electrons).
D) fluorescent is more efficient because very little heating is involved.
E) the two types have roughly equal efficiencies.
D
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Momentum: Three objects are moving along a straight line as shown in the figure. Taking the positive direction to be to the right, what is the total momentum of this system?
A. +106 kg ? m/s B. -106 kg ? m/s C. +14.0 kg ? m/s D. -14.0 kg ? m/s E. 0.00 kg ? m/s
Water flowing in a pipe is similar to electric current flowing in a circuit. Which concept in the water flow system is analogous to the battery in an electric circuit?
a) Pump
b) water
c) valve
d) pressure
A nearsighted man wears contact lenses of -3.00 diopters. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?
What will be an ideal response?
How much power is being dissipated by one of the 10-? resistors?
a.
24 W
b.
9.6 W
c.
16 W
d.
6.4 W