Yes as long as it is the right voltage: a 6v battery needs a 6v charger; a 12v battery needs a 12v charger.
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If you can set the battery charger's output to give either a 6 or a 12 volt output, then you must always remember to set it to 6 volts if you want to use it to charge a 6 volt motorcycle car battery.
Depends on the amperage of the charger. A 10 amp charger will charge it in about 1 hour.
In 24 hours it will be charged enough to start the car. You really need a much larger charger for a car battery.
Very gently. A motorcycle battery can't take as much charging current as a car battery, so you need to use the lowest setting on your charger.
A trickle charger is a car battery charger that is designed to be left on a car for very long periods of time to re-charge that car battery by slowly adding charge to the battery.
Any car charger will do. I recommend that you use a trickle charger rather than a jump charger. Also, look into a Battery Tender which will not only charge your battery at a proper pace, but you can leave it plugged in an the Battery Tender will maintain your battery for you so that it never becomes low again.
wth a charger
sure, you can buy a battery charger that will charge any car battery.
No, the battery charger has to match the voltage of the battery it is to charge.
If it is an automatic charger let it charge until the charger shuts off.
As long as both batteries are the same voltage, you can jump start with the battery. If you want to charge the battery then use a battery charger.
No, you can charge the battery while it's in the car.
It is perfectly fine to charge a power wheel battery with a car charger. It is imperative that you make sure the charger is set to the same voltage as the power wheels battery though.