Physics Questions
2007-09-13 2:54 am
1) Mary cycles at an average speed of 10.5 m/s around a circular track in anticlockwise direction. She stops after 3 mins. The radius of the circular track is 400m. What is her average velocity.
回答 (2)
2007-09-13 3:28 am
✔ 最佳答案
distance=10.5x3x60=1890mangle=1890/400=4.725rad
displacement=[2(400)^2-2(400)^2cos4.725]^1/2=562m (cosine formula)
velocity=d/t=562/180=3.12m/s
2007-09-14 7:28 am
你係唔係想問個average ANGULAR velocity 呀? 如果係, 就等於 4.725rad / 180sec (自己咁計數機)
收錄日期: 2021-04-13 13:26:32
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