Homework, 7 General Physics

# Homework, 7 General Physics - General Physics II Homework 7...

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General Physics II Homework 7 Worked Examples Giancoli: 18.35, 18.40, 18.46, 18.50, 18.54, 18.64, 18.72, 19.3, 19.19 35. ( a ) Calculate the resistance from Eq. 18-2a, and the power from Eq. 18-5. ( b ) If four D-cells are used, the voltage will be doubled to 6.0 V. Assuming that the resistance of the bulb stays the same (by ignoring heating effects in the filament), the power that the bulb would need to dissipate is given by Eq. 18-6b, . A doubling of the voltage means the power is increased by a factor of 4 . This should not be tried because the bulb is probably not rated for such a high wattage. The filament in the bulb would probably burn out, and the glass bulb might even explode if the filament burns violently. 40. The water temperature rises by absorbing the heat energy that the electromagnet dissipates. Express both energies in terms of power, which is energy per unit time. This is about 134 ml per second. 46. Use the average power and rms voltage to calculate the peak voltage and peak current. ( a ) (b) 50. (a) Use Ohm’s Law to find the resistance.

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