1. A 0.2-kg ball, attached to the end of a horizontal cord, is revolved in a circle of radius 1 meter and ball’s maximum speed is 10 rpm. What is the magnitude of the 向心加速度 and the magnitude of the tension force?
已知：
质量 （米）= 0.2 千克
Radius (r) = 1 m
角速度 (ω) = 10 rev/min = 10 rev/60 s = 0.17 rev/s = (0.17)(6.28 rad)/s = 1 rad/s
速度 (v) = r ω = (1 米)(1 弧度/秒) = 1 米/秒
招聘： as 担 ΣF
解决方案：
(a) The magnitude of the centripetal acceleration
(b) The magnitude of the tension force
ΣF = ma
T = m as
T = (0.2 kg)(1 m/s2)
T = 0.2 kg m/s2
T = 0.2 牛顿
2. A 1-kg ball at the end of a string is revolving uniformly in a horizontal circle of radius 1 m. The cord will break when the tension in it exceeds 100 N. What is the maximum speed the ball can have?
已知：
质量 (m) = 1 kg
Radius (r) = 1 meter
Tension force (T) = 向心力 (ΣF) = 100 N
通缉： v maximum
解决方案：
[wpdm_package id ='499']
- 质量和重量
- 法向力
- 牛顿第二运动定律
- 摩擦力
- Motion on a horizontal surface without friction force
- The motion of two bodies with the same acceleration on the rough horizontal surface with a friction force
- Motion on an inclined plane without friction force
- 在粗糙斜面上受摩擦力作用的运动
- 电梯内的运动
- 物体的运动是通过绳索和滑轮实现的。
- 两个加速度大小相同的物体
- 绕平缓曲线运动——圆周运动的动力学
- 绕倾斜弯道行驶——圆周运动动力学
- 水平圆周匀速运动
- 匀速圆周运动中的向心力
