The best time for digging clams (when the low tide is extra low) is during the time of the
A) new or full moon.
B) half moon.
C) quarter moon.
D) none of the above
Answer: A
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Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is
A. twice as great. B. the same. C. one half as great. D. none of these answers are correct
If the maximum voltage of an ac signal is 8.0 V, what is the rms value of this voltage?
A) 2.8 V B) 5.7 V C) 6.2 V D) 4.0 V E) 16.0 V
What is the temperature increase of 3.0 kg of water when heated by an 800-W immersion heater for 10 min? (cw = 4186 J/kg • °C)
a. 56°C c. 29°C b. 38°C d. 14°C
A string with a mass per length of 2.00 g/m is stretched between two points that are 0.400 m apart. The third mode frequency of the stretched string is 20.0 Hz lower than the fourth mode frequency. What is the tension in the string?
A. 180 N B. 160 N C. 140 N D. 120 N E. 100 N