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a) The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 2.3 105 N/C.The drum has a length of 40 cm and a diameter of 11 cm. What is the total charge on the drum?
b) The manufacturer wishes to produce a desktop version of the machine. This requires reducing the size of the drum to a length of29 cm and a diameter of 8.0 cm. The electric field at the drumsurface must remain unchanged. What must be the charge on this new drum?
At time a grinding wheel has an angular velocity of 21.0. It has a constant angular acceleration of 26.0 until a circuit breaker trips at time = 1.6. From then on, the wheel turns through an angle of 435 as it coasts to a stop at constant angular dec..
A nonconducting solid sphere of radius R carries a volume charge density that is proportional to the distance from the center: ? = Ar for r ? R, where A is a constant; ? = 0 for r > R. Find the total charge in the sphere
A spring with a force constant of 588N/m is compressed a distance of 42cm. Find the resulting increase in the spring's mass
A gymnast performing a routine on the high bar feels weightless at the highest point of their rotation. Why does the gymnast feel weightless at the highest point of their rotation around the bar? What is the cause of this phenomenon
A student m1 = 70 kg runs towards his skateboard, which has a mass m2 = 2.6 kg and is d = 2.8 m ahead of him. What is the velocity of student and skateboard
A capacitor is connected across an ac generator whose frequency is 751 Hz and whose peak output voltage is 140 V. What is the magnitude of the maximum charge on one plate of the capacitor
A 20.0 kg mass at rests decays into a particle that is moving at 0.30c. What is the mass of this new particle
A doorway acts as a single slit for light that passes through it, but a doorway is much larger than the wavelength of visible light, Estimate the width of the doorway
Together, two students exert a force of 640 N in pushing a car a distance of 30 m. How much work do the students do on the car
The following charges are located inside a submarine: 6.20 µC, ?9.00 µC, 27.0 µC, and ?59 µC. find the net electric flux through the hull of the submarine
In an experiment the speed of sound in air, a student a measures a column of air in a resonance tube. find the speed of sound in the room
A 150-lb male athlete is running on a treadmill machine at a speed of 10 mi/hr in a thermally insulated room. How do entropies change in the body of the athlete and in the room
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