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A parallel-plate air capacitor has a capacitance of 300 {\rm pF} and a charge of magnitude 0.250 \mu {\rm C} on each plate. The plates are 0.500 {\rm mm} apart.
What is the area of each plate?
m^2
What is the surface charge density on each plate?
C/m^2
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What is current in the coil
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A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30. At 10.0 after blastoff, the engines suddenly fail, which means that force they produce instantly stops.
Two blocks made of different materials, connected by a thin cord, slide down a plane ramp inclined at an angle 32 degrees to the horizontal. Determine the tension in the cord
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