To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
4.3 MJ, 1.2 kWh
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Standing Waves on a String: One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
A. 26.1 Hz B. 8.7 Hz C. 4.35 Hz D. 30.4 Hz E. 17.4 Hz
An unknown resistor is wired in series and an ammeter and a voltmeter are placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is the true resistance. B) is greater than the true resistance. C) is less than the true resistance. D) could be anything. It depends on other factors.
If the proto star that became our Sun had been hotter and more luminous when it formed, what changes (if any) might have been experienced by our Solar System?
A) The Moon would not exist. B) Jupiter would now be farther from the Sun. C) No comets could have formed. D) Mars would be a gas giant. E) Terrestrial planes could only have formed closer to the Sun.
State the general rule for significant figures when multiplying or dividing numbers
What will be an ideal response?