速率保持不变,但速度矢量会发生变化。
The speed is not changing, but the velocity vector is changing.
谈话测试能够反映出锻炼者的跑步速度、心跳速率,能感觉出锻炼强度是否过高。
Running speed, heart rate, and ratings of perceived exercise intensity were all well correlated with the talk test results.
因此,我们可以用星星的自转速度及速率作为衡量它们年龄的计时器。
And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age.
This is the starting speed, that's the rate at which it is gaining velocity, and that's how long it's been gaining it.
这是起始时的速度,这是速度的增长速率,这是加速的时间
The angle is increasing at a steady rate, so we know it's going at a steady speed.
转过的角度以恒定速率增加,所以我们知道它以一个恒定的速度运动
It's gaining speed at some rate a.
速度的增长速率为a
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