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Problem: What must the charge (sign and magnitude) of a particle of mass 1.40g be for it to remain stationary when placed in a downward-directed electric field of magnitude 600N/C?
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A spherical weather balloon is filled with hydrogen until its radius is 3.40 m. Its total mass including the instruments it carries is 10.0 kg. Find the buoyant force acting on the balloon
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at a certain instant a 25-kg object is sliding eastward at a speed of 8.0 ms propelled by an eastward force of 125 n.
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An object rotates about a fixed axis, and the angular position of a reference line on the object is given by ? = 0.60e8t, what are the magnitudes of the point's
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