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A force F is applied horizontally to a block of mass 2 kg which, nevertheless, slides down a frictionless 5-m plane inclined at 25 degrees to the horizontal.
(a) If the block starts from rest, and reaches the bottom of the plane in 2s, what is its acceleration down the plane?
(b) What is the magnitude of the force F?
A 1.2 µF capacitor has an electric field of 0.8x105 V/m between two metal plates 1.1 mm apart. What is the energy stored on the capacitor
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A ball thrown straight up from the ground passes a window 5.6 m up. An observer looking out the window sees the ball pass the window again, going down, 2.6s later
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