A boat loaded with wood floats in a swimming pool. When the wood is thrown overboard, the pool level
A) rises.
B) falls.
C) remains unchanged.
Answer: C
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A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is
A) 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians. (b) The current in the resistor A) leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A) It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle. What will be an ideal response?
The length of a certain wire is doubled and at the same time its radius is increased by a factor of 4. What is the change in the resistance of this wire?
A) It is reduced by a factor of 8. B) It increases by a factor of 8. C) It is reduced by a factor of 4. D) It increases by a factor of 4. E) It stays the same.
A "grand-design" galaxy contains clear spiral arms with few spurs
a. True b. False Indicate whether the statement is true or false
What happens when an interstellar cloud fragment shrinks?
A) It first becomes opaque. B) Density rises. C) Temperature rises. D) Pressure rises. E) All of the above.