You contact a personal injury lawyer to discuss your options

I was a passenger in a vehicle which got rear ended and hit a parked car, would I be able to sue the parked car's insurance?

Doesn't appear that parked car did anything wrong. You claim is against the car that rear-ended you. And possible your driver if he did anything...

You should consult with a medical practice lawyer asap.

I moved into a homeless shelter in Brooklyn, NY 1 week ago. The water is so hot I got 3rd degree burns on my arm can I sue?

Would should discuss this with a personal injury lawyer as soon as possible.

Can I sue?

Sounds like you should call a personal injury lawyer.

Of course you can. Consult with a personal injury lawyer. Depending on the threshold option you chose you will have to show a serious injury.

Is it worth filing a police report after a hit and run as a pedestrian?

You should definitely file and consult with a personal injury lawyer.

Yes, if your doctor relates it to the accident. Contact a personal injury lawyer for a few consultation.

If you are injured, you should consult with a personal injury lawyer.

You need to consult with a medical malpractice lawyer as soon as possible.