275297316-Physics-2-Quiz.pdf

4 the amount of heat required to heat water is equal

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4. The amount of heat required to heat water is equal to mass x specific heat x change in temperature where specific heat = 1000 cal / kg°C. What should be the resistance of a heating coil if it is used to rise the temperature of 500 g of water from 28 °C to boiling point in 2 minutes, assuming that 25% of heat is lost. The heater operates in a 240 V line. NAME ________________________________________________ DATE: __/__/____ SCORE: _________ PHY102 - PHYSICS 2 QUIZ 4 INSTRUCTIONS : Solve the following questions. Write your solutions in a separate sheet of paper (quiz notebook). Round off intermediate results to 5 decimal places. Final answers shall be written to 2 decimal places. Use scientific/engineering notation if your answer has a value less than 1. Write your final answers below each question. 1. For the circuit given, find the potential difference from (a) A to B, (b) B to C, and (c) C to A. 2. A battery supplies current of 12 A to charge a storage battery which has an open-circuit voltage of 5.6 V. If the voltmeter is connected to the battery while charging shows a reading of 6.8 V, what is the internal resistance of the battery? 3. The resistivity of Aluminum is 2.8 x 10 -8 ohms. (a) How long a piece of aluminum 1.2 mm in diameter is needed to give a resistance of 4.2 ohms? (b) If the length is reduced to half of the original, and the diameter increased by 10 percent, what will be the new resistance? 4. The amount of heat required to heat water is equal to mass x specific heat x change in temperature where specific heat = 1000 cal / kg°C. What should be the resistance of a heating coil if it is used to rise the temperature of 500 g of water from 28 °C to boiling point in 2 minutes, assuming that 25% of heat is lost. The heater operates in a 240 V line.
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