magnetic is stronger , However, it has been said that nothing can escape a black hole, not even light itself. as far as using the power of magnetism to escape the gravitational pull of a black hole, it would have to be an extremly , absurdly powerful magnet and you would have to have to something that was not being pulled into the hole to escape to. also think about this, magnetic fields are only as powerful as the field is strong, so distance plays a key role in this situation.you wouldn't be able to get anything far enough away from the black hole that you could maintain a magnetic field with. as far as a vehicle to create a field with i'm not sure there will be any type of propulsion that would be able to escape the force of the hole's gravity for the vehicle.
On a motorbike the front brake provides about 70% of the bikes stopping power. Disc brakes are better suited to this job as they are a better brake because they dont need adjustment as much, they are self cleaning and dissipate heat much better. They last longer and are far more maintenance free than drum brakes. The back wheel provides 30% of the stopping power when you brake so even a disc brake on the back wouldnt improve its braking ability beyond that 30%.
No offense dead 7, but you've missed a couple of things. First of all, rear brakes or drum brakes are not necessarily more powerful than a front brake or disc brake. It all comes down to the friction area between the pad or shoe and the drum or disc and the pressure applied to the shoe or pad, either mechanical (rod and lever) or hydraulic (pressurized fluid). Any brake that will lock up the wheel, front or rear, is powerful enough and it doesn't matter whether it's disc or drum. Often times, disc brakes are easier to modulate and resistance applied is more or less linear. In the not so good old days, some times drum brakes had a bad habit of doing a little braking and then suddenly doing too much, producing a eye widening experience. Front end dive has little if anything to do with how powerful the front or rear brake is. When you apply the brake at either end, weight is shifted forward, compressing the front springs. The spring resistance, thickness of shock oil, anti dive features and shaft or chain drive all have an effect on the amount of dive. The biggest difference between drums and discs is fade resistance. When you apply the brakes, friction heats everything up. With a drum, the heat makes the drum bigger in diameter and if hot enough, it's so large that the shoes can't make firm contact with surface. The design differences in discs prevents this from happening. However, discs can fade when enough heat causes the brake fluid to boil, producing a compressable gas. Riding the brakes lightly for long periods of time will cause brake fade more than will short periods of hard application. The main reason drum brakes are still used is cost. They are cheaper to manufacture than are disc systems. THAT'S the main reason drums are still used.
Apart from a few very cheap small capacity scooters and mopeds i thought all new bikes didn't use Drums anymore! I stand corrected Shaun ! PS i wont be buying a Honda Shadow then ! LOL
In general, magnetic is stronger. But gravity is based on the mass of the object causing it, so if you have enough mass, it will be HUGE. I can't think of a magnetic source that could overcome the force involved in a black hole. That having been said, there are particles that escape from black holes pretty routinely.
