they could be bent or you need to get the wheels and tires spin balanced.
Tire out of balance is the most common cause.
If it is while you are braking, the rotors or druma are warped.
A failed U-joint would be a very likely cause.
Yes it could.
Not running on all cylinders? Bad harmonic balancer?
A bad rotor would not necessarily cause a bad vibration as it would most likely create a noise and wear your break pads down unevenly. It could be as simple as an unbalanced tire or a warped rim. Also if your tires are choppy then a vibration can become noticeable. Also a bad bearing or axle could cause vibration (however, it would be noticeable at a lower speed).
U joint or tire would be the most common.
Warped brake rotors.
Yes, it sure can.
it cant do that because no one can stop a vibration only the earth could
Check the entire front end assembly. Wear in the tie rod ends, ball joints, or other components can cause the vibration.
Vibration could cause it to jump as from a minor earthquake or washing machine.