At which of the following temperatures would one liter of water weigh the most?
a. 2°C
b. 4°C
c. 8°C
d. 90°C
e. It would weigh the same at all these temperatures.
b
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Simple Pendulum: A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?
A. Both periods would remain the same. B. Both periods would increase. C. Both periods would decrease. D. The period of the pendulum would increase but the period of the spring would stay the same. E. The period of the pendulum would decrease but the period of the spring would stay the same.
RC Circuits: A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A. The charge on the capacitor after four time constants is about 98% of the maximum value. B. The charge on the capacitor after one time constant is 50% of its maximum value. C. The charge on the capacitor after one time constant is 1/e of its maximum value. D. The voltage on the capacitor after one time constant is 1/e of the maximum value. E. The voltage on this capacitor after one time constant is 100% of its maximum value.
A string on a guitar is stretched between two points 35.0 cm apart with a tension of 65.0 N. The mass/length of the string is 0.00400 kg/m. The wavelength of the mode of vibration with the lowest frequency is
A. 0.5 m. B. 0.6 m. C. 0.7 m. D. 0.8 m. E. 0.9 m.
A gas expands from an initial volume of 0.040 m3 and an initial pressure of 210 kPa to a final volume of 0.065 m3 while its temperature is kept constant. How much work is done by the system?
A) 3.7 kJ B) 4.1 kJ C) 5.3 kJ D) 5.6 kJ E) 7.9 kJ