Physics Laboratory Experiments
Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 25, Problem 5Q
To determine

The effect on resistance on thermistor as the temperature approaches absolute zero.

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Water is heated to boiling under a pressure of 1.0 atm. When an electric current of 0.50 A from a 12V supply is passed for 300 s through a resistance in thermal contact with it, it is found that 0.798 g of water is vaporized. Calculate the molar internal energy and enthalpy changes at the boiling point (373.15 K).
Consider a plate-type collector with a wire to plate spacing of 0.115 m (4.5 in.) and an applied voltage of 50 kV. The mean gas velocity through the collector is 1.5 m/s. Estimate the collecting plate length required for a collection efficiency of 100 per- cent for 0.5-um particles at 420°K. Assume that p = 2.1.
In the calibration step of a thermochemistry experiment, a current of 124 mA, from a 24.0 V source was allowed to flow through the electrical heater for219 s and was found to result in an increase in the temperature of the calorimeter and its contents of +1.39 K. Given that the energy supplied by an electrical circuit is the voltage multiplied by the current, multiplied by the time, what is the heat capacity of the calorimeter and its contents?  A) 194 JK^-1 B) 322 JK^-1 C) 469 JK^-1 D) 731 JK^-1
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