A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum speed can the mass have if the string is not to break?
A、370 m/s;
B、22 m/s;
C、19 m/s;
D、29 m/s;
E、25.9 m/s;
F、2.87 m/s; G:95 m/s; H:395 m/s
发布时间：2025-08-24 21:42:27
