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A 3.00- length of copper wire at 20 has a 1.20--long section with diameter 1.8 and a 1.80--long section with diameter 0.90 . There is a current of 2.5 in the 1.8 -diameter section. 1.What is the current in the 0.90 -diameter section? 2.What is the magnitude of in the 1.8 -diameter section? 3.What is the magnitude of in the 0.90 -diameter section? 4.What is the potential difference between the ends of the 3.00-length of wire?
A heart defibrillator delivering 400 J of energy by discharging a capacitor initially at 10,000 V has a capacitance of 8.00 µF (see Example 18.11 of the textbook). What is the voltage of the second defibrillator
question1astronomers detect a large asteroid that far away but still heading toward earth at 754 ms. a straight
Stretching DNA. With its double-helix structure, DNA is coiled like a spring. What's the DNA's spring constant
Two bugs are buzzing with the same frequency of 186Hz. One of the bugs is flying away from a stationary observer at 9.0m/s, What is the beat frequency that the observer hears
A proton (mass 1 ) is shot toward an unknown target nucleus at a speed of 2.75×106 . The proton rebounds with its speed reduced by 25 while the target nucleus acquires a speed of 3.01×105 . What is the mass, in atomic mass units, of the target nucleu..
A parallel-plate capacitor with air dielectric has a plate area of 75cm^2. if the capacitor is fully charged by a 300-v source and can hold a charge of 7.5x10^-9c, what is the distance between the plates
A dentist uses a mirror to examine a tooth that is 0.75 cm in front of the mirror. The image of the tooth is formed 14.0 cm behind the mirror. Determine the magnification of the image
A car traveling on a flat (unbanked) circular track accelerates uniformly from rest with a tangential acceleration of at. Determine the coefficient of static friction between the car and track from these data
A VW Beetle goes from 0 to 65.7 mi/h with an acceleration of +2.34 m/s^2. Find the acceleration of the dragster
A 140 kg piano is being lifted at a steady speed from ground level straight up to an apartment 16.0 m above the ground. The crane that is doing the lifting produces a steady power of 400W. Explain how much time does it take to lift the piano?
An experimental bicycle wheel is placed on a test stand so that it is free to turn on its axle. If a constant net torque of 5.00 N · m is applied to the tire for 3.00 s, Compute the friction torque
The core of a star collapses during a supernova, forming a neutron star. find the neutron star's angular velocity in revolutions per second, given the core's was originally 1.0 revolution per 30 days
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