Between ac and dc, which is more dangerous? if so, what makes it dangerous?

AC is more dangerous because the chance of a human suffering from Ventricular Fibrillation is much higher in the case of AC than DC. On the other hand, the impedance for DC is higher compared to AC so the harshness of electric shock would be comparatively lower than AC. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm