Question

质量500kg的小车静止在半径50m的凸形桥顶部

Answer 1

1,

F=G

=mg

=500*10

=5000N

2,

mg-F=mV^2/R

F=5000-500*36/50

=4640N

3,

mg=mV^2/R

V=√gR

=√10*50

=10√5m/s