问题
多选题
如图所示，长为L的细绳一端固定，另一端系一质量为m的小球。给小球一个合适的初速度，小球便可在水平面内做匀速圆周运动，这样就构成了一个圆锥摆，设细绳与竖直方向的夹角为θ。下列说法中正确的是
A.小球受重力、绳的拉力和向心力作用
B.小球只受重力和绳的拉力作用
C.θ越大，小球运动的速度越大
D.θ越大，小球运动的周期越大
答案
BC
搜题请搜索小程序“爱下问搜题”
如图所示，长为L的细绳一端固定，另一端系一质量为m的小球。给小球一个合适的初速度，小球便可在水平面内做匀速圆周运动，这样就构成了一个圆锥摆，设细绳与竖直方向的夹角为θ。下列说法中正确的是
A.小球受重力、绳的拉力和向心力作用
B.小球只受重力和绳的拉力作用
C.θ越大，小球运动的速度越大
D.θ越大，小球运动的周期越大
BC
| 阅读下列短文，从短文后各题所给的(A、B、C、D)四个选项中选出能填入相应空白处的最佳选项。 | ||||
| Juan Gomez wakes up at six o'clock every morning. He gets up, takes a 1 , gets dressed, and eats breakfast. After breakfast he 2 the newspaper until 7:15, then he leaves for work. He gets on the bus at the bus stop, rides it to University Avenue, 3 , and walks to his office. He works 4 five o'clock. He usually goes and plays basketball with friends after work. Then he goes home. Juan 5 a very boring life. | ||||
|