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A variable capacitor consists of two thin coaxial metal cylinders of radii a and b, with (b-a)<<a, free to move with respect to each other in the axial direction. The length of the cylinders is L, and the potential difference between the two cylinders is V. Using energy methods, find the magnitude and direction of the force on the inner cylinder when it is displaced by a small amount with respect to the outer one. Expain how this force arises.
A bird stands on a dc electric transmission line carrying 3200A. What is the potential difference between the bird's feet
A particle of charge q = e moves in a circle of radius = 0.42 m with speed v = 2.150×107 m/s. find the maximum torque exerted on the loop by a uniform magnetic field of magnitude B = 0.60 T
A turbine that uses steam drives an electric generator. The inlet stream flows through a 10 cm diameter pipe to the turbine at 2.5 kg/s at 600°C and 1000 kPa. The exit steam discharges through at 25 cm diameter pipe at 400°C
A 6.00 kg mass (m) is suspended from a 65 kg flywheel having a radius of 0.75 m. Determine the angular acceleration of the flywheel as the mass falls
In an experiment designed to measure the strength of a uniform magnetic field produced by a set coils, What is the magnitude of the magnetic field
Ice of mass 45.5 g at -10.9° C is added to 212 g of water at 15.8° C in a 101 g glass container of specific heat 0.200 cal/g-°C at an initial temperature of 22.7° C
We pass a laser beam through a double slit. On a screen 18.52 m away, we observe a series of bright lines which are 3.4 mm apart. What is the distance between the two slits
An aluminum-alloy rod has a length of 10.009 cm at 16.200°C and a length of 10.021 cm at the boiling point of water. compute the length of the rod at the freezing point of water
On a swing, a 37 kg girl undergoes small-amplitude oscillations with period 4.1 s. How long are the ropes that support the swing
A ski jumper has 1.2 ´ 10 J of potential energy at the top of the ski jump. The friction on the jump slope is small, but not negligible. What can you end about the ski jumper's kinetic energy at the bottom of the jump.
A daredevil on a motorcycle leaves the end of a ramp with a speed of 36.0 m/s, what is the maximum height that he reaches
a 35 horizontal metal bar 14 long is free to slide up and down between two tall vertical metal rods that are 14 apart.
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