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Q1. A certain car battery with a 14.0 V emf has an initial charge of 195 A•h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how long in hours can it deliver energy at the rate of 184 W?
Q2. The immediate cause of many deaths is ventricular fibrillation that is an uncoordinated quivering of the heart. An electric shock to the chest can reason for momentary paralysis of the heart muscle, after which heart sometimes resumes its proper beating. One type of defibrillator (photo below) applies a strong electric shock to the chest over a time interval of a few milliseconds. This device contains a capacitor of numerous microfarads, charged to several thousand volts. Electrodes called paddles are held against the chest on both sides of the heart, and capacitor is discharged through the patient's chest. Suppose energy of 270 J is to be delivered from a 30.0-µF capacitor. To what potential difference must it be charged?
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If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
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The resistance of a copper wire of length L meter is 0.1 ohms. If the diameter of the wire is 0.045cm, find out its specific resistance.
What minimum horsepower must a motor have to be capable to drag a 290 box along a level floor at a speed of 1.05 if the coefficient of friction is 0.50.
What current is required in the windings of a long solenoid that has 1710 turns uniformly dispersed over a length of 0.547 m in order to produce a magnetic field of magnitude 0.0002 T at the center of the solenoid.
A current of 10^-14 A is produced in a free-air chamber operating under saturation conditions. The sensitive volume, in which electronic equilibrium exists, contains 0.22g of air. What is the exposure rate .
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