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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?
A source emits sound uniformly in all directions. There are no reflections of the sound. What is the total sound power P emitted by the source
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m?K), How much heat flows through the wall in one hour
A piston-cylinder system has initial volume 1.0 liters, and contains ideal gas at 300k and 1 atm, with Cv=2.5R. What is the rate at which the gas does work
A certain toaster has a heating element made of Nichrome resistance wire. What is the final temperature of the heating element
When people exercise they shed heat to the environment by sweating and radiating. calculate the rise in body temperature after 1 hour
A cat is trying to jump onto a countertop that is 1m tall from 0.3m away. The cat's initial jump speed (magnitude of the total initial velocity) is 10m/s
A disc spins at 20 [rpm]. Calculate the period of rotation (which is the time interval required for 1 revolution)
Huck Finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion relative to the shore). What is Huck's velocity (speed and direction) relative to the river bank
q1. on the wheel of fortune game show a solid wheel of radius 6.7 m and mass 10 kg is given an initial counter
A plane of a 5.0 cm x 8.0 cm rectangular loop of wire is parallel to a 0.19 -T magnetic field. The loop carries a current of 6.2 A. What is the magnetic moment of the loop
Calculate the linear acceleration of a car, the 0.310 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. What is the final velocity of the car
A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 16 m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
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