Acurrent exists whenever electric charges move. if δq is the net charge that passes through a surface during a time period δt, then the average current during this time interval is defined asaverage current = δqδt = q2 − q1t2 − t1.if we take the limit of this average current over smaller and smaller time intervals, we get what is called the current i at a given time t1: i = lim δt→0 δqδt = dqdt. thus the current is the rate at which charge flows through a surface. the current in a wire is defined as the derivative of the charge: i(t) = q'(t). what does bi(t)a dt represent?
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Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)
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Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. the ice dissolves oxygen from the air, forming a denser crystalline matrix. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.
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Acurrent exists whenever electric charges move. if δq is the net charge that passes through a surfac...
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