A 1185 kg car traveling at 55 km/h is brought to a stop by its braking system. How much thermal energy is evolved in the brakes? Friction with the ground does no work unless there is slipping.
Depends on the style of spare tire you have got. I have a Ford F-250 pickup truck and my spare is solely one other tire, identical to all 4 of the others, so I could pressure on it for the rest of it can be lifestyles. However, i have a Geo Metro with a compact spare, which is rated for forty miles at forty miles per hour (I consider, i am not certain i'm remembering the specs correctly). It is not designed for use for the long run, simply ample to get to the place i will get the normal tire repaired. I might no longer count on it for various miles at rather low speed.
Not safe at all really. If you must lift the whole front end lift one side, put it on a jack stand, then lift the other side. Still not an ideal situation. Make sure the parking brake is on firmly, and the wheels are chocked with something heavy.
They're meant to get you out of a pinch, not to do something like that. You can get jack stands cheap enough. Remember, it's your life under there, spend the money. I don't know your living arrangement but you could always pull half the car onto the curb if you have one, it'll lean it a little to the side but should give you enough room to do an oil change. Been there, done that.
A 1100 kg car traveling at 55 km/h is brought to a stop by its braking system. How much thermal energy is evolved in the brakes? Friction with the ground does no work unless there is slipping.
