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An electric toothbrush rests on a stand containing a 50-turn coil connected across the 120-V rms AC power line. Inside the brush handle is another coil whose induced current charges a 6-V battery. How many turns should this coil contain if its peak emf is to be 7.1 V?
q1. a 9.7 v battery is connected to a bulb whose resistance is 1.3. how many electrons leave the battery per minute?q2.
The alveoli in the lungs have an average radius of 0.125 mm and areapproximately spherical. If body temperature is 37.0 degrees C, and the pressure in the lungs is atmospheric pressure:
A circuit has three resistors in series with a 36 volt source, The voltage across the third resistor is 20 V, Determine the three resistor values
A person of mass 75 kg stands at the center of a rotating merry-go-round platform of radius 3.1 m and moment of inertia 1300 kg ·m2. Calculate the angular velocity when the person reaches the edge
question a 78.3 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate
a rod 16.0 cm long is uniformly charged and has a total charge of -21.0 microc. determine the magnitude and direction
As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 510m to be the other plate.
A blue car of length 4.41 m is moving north on a roadway that intersects another perpendicular roadway (see figure below). The width of the intersection from near edge to far edge is 30.0 m.
A professional boxer hits his opponent with a 1000 N (225 lb) horizontal blow that lasts for 0.15 s. Calculate the impulse imparted by his blow
A person's body is covered with 1.69 m2 of wool clothing. The thickness of the wool is 2.12 × 10-3 m. How much heat per second does the person lose due to conduction
You're an optometrist, mounting a projector at the back of your 4.2m -long exam room, 2.6m above the floor. At what height should you center the pattern on the wall
Xenon ions with a mass of 2.20×10?25 kg and charge +e are accelerated between the plates of an ion drive rocket engine to an exhaust velocity of 43,200 m/s. What is the potential difference between the plates
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