A particular object appears to be red. The reason it appears red is:
1.It absorbs only red frequencies as they hit.
2.It reflects only red frequencies as they hit.
3.It absorbs red frequencies more than other frequencies.
4.It reflects red frequencies more than other frequencies.
5.It emits red frequencies more than other frequencies.
6.Not enough information.
4,5,6
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The density of an average person is about
1) 480 kg/m3 (30 lb/ft3). 2) 960 kg/m3 (60 lb/ft3). 3) 1920 kg/m3 (120 lb/ft3). 4) 2400 kg/m3 (150 lb/ft3). From this we can see that the volume of a 120-lb person is about 5) 1 ft3. 6) 2 ft3. 7) 3 ft3. 8) 4 ft3. 9) not enough information to estimate.
An LRC ac circuit has a reactance (due to its capacitance) of 17 k?, a reactance (due to its inductance) of 9.0 k?, and a resistance of 28 k?. What is the power factor of the circuit?
A) 0.96 B) 0.28 C) 1.04 D) 0.48
A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m
If heavier elements are more stable when they have more neutrons, what happens to the heaviest elements?
a. They have very large nuclei to sustain the number of neutrons needed for stability. b. Above a certain atomic mass, there are no stable elements. c. For high enough atomic mass, there is no longer a rule to determine which nuclei are stable. d. The curve reverses and the nuclei of the heaviest elements are more even matches of protons and neutrons. e. The curve reverses completely and the nuclei of the heaviest elements are stable with many more protons than neutrons.