What is the approximate density of a fish, compared with the density of water? Defend your answer
What will be an ideal response?
Answer: The density of a fish is the same as the density of the water in which it swims. If the fish were more dense, it would sink in the water. If the fish were less dense, it would float. The fact that a fish neither floats nor sinks is evidence that its density matches that of water.
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Series/Parallel Circuits: Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?
What will be an ideal response?
Suppose a highway curve is properly banked to eliminate friction for a speed of 45 mph. If your tires were bald and you wanted to avoid sliding on the road, you would have to drive
A) somewhat below 45 mph. B) somewhat above 45 mph. C) at exactly 45 mph.
Which force is strongest within an atomic nucleus?
A) strong B) weak C) electromagnetic D) gravity E) They are all equal.
If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustrating
A) Coulomb's law. B) conduction and insulation. C) charge polarization. D) voltage.