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2003年高考物理试题(江苏)第15小题,是一道难得的好题。原题如下: 当物体从高空下落时,空气阻力随速度的增大而增大,因此经过一段距离后将匀速下落,这个速度称为此物体下落的终极速度。已知球形物体速度不大时所受的空气阻力正比于速度v,且正比于球半径r,即阻力f=krv,k是比例系数。对于常温下的空气,比例系数k=3.4×10-4 Ns/m2。已知水的密度ρ=1.0×103kg/m3,取
The 15th question in the 2003 college entrance examination physics test (Jiangsu) is a rare good question. The original question is as follows: When the object falls from a high altitude, the air resistance increases with the speed, so after a certain distance will fall at a uniform speed, this speed is called the ultimate speed of the falling of this object. It is known that the air resistance when the spherical object is not at a high velocity is proportional to the velocity v, and is proportional to the radius r of the ball, that is, the resistance f=krv, where k is a proportional coefficient. For air at room temperature, the proportional coefficient k = 3.4 x 10-4 Ns/m2. Known water density ρ = 1.0 × 103kg/m3, take