Ratio of cross-sectional areas
Two wires a and b of circular cross section are made of the same metal and have equal lengths, but the resistance of wire a is three times greater than that of wire b. what is the ratio of their cross-sectional areas? how do their radii compare?
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What must the charge (sign and magnitude) of a particle of mass 1.42g be for it to remain stationary when placed in a downward-directed electric field of magnitude 670N?
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What is the relationship between air resistance and surface area?
An airtight box has a removable lid of area 2.0 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.75 105Pa. The inside of the box is completely evacuated. What is the magnitude of the force re
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A diving board length L = 6.00 m that weighs 210 N is supported by two pillars. One pillar is at the left end of the diving board, as shown below; the other is distance d = 1.60 m away. Find the magnitude of the force exerted by the left pillar wh
How far does the motorcycle travel from the moment it starts to accelerate (at time t_1) until it catches up with the car (at time t_2)?
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