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A long round wire of radius a and conductivity σ is coated with a material of conductivity 0.1σ. (a) What must be the thickness of the coating so that the resistance per unit length of the uncoated wire is reduced by 50%?
Why R1 must be equal to R2 so that the resistance of the uncoated wire is reduced by 50%?
A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door. The door begins to rotate with an angular acceleration ..
A thin rod of mass M and length L is hinged at the floor as shown. It initially stands vertically and is released from rest. With what angular speed will it strike the floor?
An automobile has a mass of 1840 kg and a velocity of 15.0 m/s. It makes a rear-end collision with a stationary car whose mass is 2110 kg. If the coefficient of kinetic friction between the wheels of the cars and the pavement is ?k = 0.565, determi..
John and Mary are skating at an ice rink. John skates at a constant speed of 7.3 m/s, What are the magnitude and direction of Mary's velocity with respect to John
Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.6 kg· m2 and an angular velocity of +7.6 rad/s. Disk B is rotating with an angular velocity of -10.8 rad/s.
A horizontal 100-turn rectangular coil is located in a uniform magnetic field of magnitude 0.900 T directed upward perpendicular to the plane of the coil. If the area of the coil increases linearly at the rate of 8.00 x 10-3 m2/s, what is the magn..
if electrical energy costs 12 cents or 0.12 per kilowatt-hour then what would the following events cost?a burning a 40w
Each croquet ball in a set has a mass of .5 kg. The green ball travels at 10.5m/s and strikes a stationary red ball. what is the final speed of the red ball after the collision
a parallel plate capacitor of capacitance c0 has plates of area a with separation d between them. when it is connected
The weight of your 1205-kg car is supported equally by its four tires, What gauge pressure is required to give an area of contact of 112 cm2 for each tire
The resistor in a series RCL circuit has a resistance of 92Ω, while the voltage of the generator is 3.0V. At resonance,what is the average power delivered to the circuit?
A 1530 kg car is travelling with the speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to the halt in a distance of 40.00 m.
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