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磁带录音机在使用过程中需要倒磁带,即磁带录音机的空带轴以恒定的角速度转动,重新绕上磁带。在高中物理中,常涉及有关磁带倒带的圆周运动问题,以下面三题为例,谈谈磁带倒带问题的解法。例1.磁带录音机倒带时以空带轴为主动轮以恒定的角速度ω转动,带动缠上磁带的轮子被动从而将从动轮上的磁带绕在主动轮上。假设空带时轮的半径为R1,倒完磁带时的半径为R2,磁带的
The tape recorder needs to be rewound during use, that is, the tape recorder’s empty-belt spindle rotates at a constant angular velocity and rewound the tape. In high school physics, it often involves the circular movement of the tape rewind. Taking the following three questions as an example, we talk about the solution of the tape rewind problem. Example 1. When the tape recorder is rewound, the idler shaft is driven at a constant angular velocity ω by driving the tape-wrapped idler wheel to wind the tape on the idler pulley around the capstan wheel. Let us assume that the radius of the empty wheel is R1 and the radius of the tape is R2 when the tape is empty