题目
题目
单项选择题

[table] In a robotics tournament, a contestant programs a battlebot’s spinning blade to speed up with a constant angular acceleration of 2.25 rad/s². After 10.0 seconds, the blade reaches an angular velocity of 35.0 rad/s. What was the blade’s initial angular velocity before it began to speed up? [/table]

选项
A.a. [table] 3.75 rad/s [/table]
B.b. [table] 12.5 rad/s [/table]
C.c. [table] 10.7 rad/s [/table]
D.d. [table] 0 rad/s [/table]
E.e. [table] 6.25 rad/s [/table]
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标准答案
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思路分析
We’re given a constant angular acceleration α = 2.25 rad/s², a time interval t = 10.0 s, and the final angular velocity ω = 35.0 rad/s. We can relate initial and final angular velocity with ω = ω0 + α t, where ω0 is the initial angular velocity before speeding up. Option a: 3.75 rad/s. If ω0 were 3.75 rad/s, then the change in angul......Login to view full explanation

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