Well, yes, but the water must be very hot. Not just like the water temperature that we shower in.
Yes, melted plastic can hurt you. The primary danger is from a burn. Melted plastic is hot, and it tends to stick to skin and clothing. It is exceptionally dangerous stuff in that regard.
Melted plastic is generally non-toxic and usually a pain to remove. It is generally disposed of as trash, as it cannot really be re-used. If it's hot, it is hazardous as it can burn you and tends to stick to skin and materials. In that light, it is dangerous. Melted plastic is the material used in injection molding. That melted plastic is not "bad" as it is being used for a purpose (the manufacture of goods).
Sure as long as they are not scolding hot!
Due To high specific heat
Mars is hot so frozen water can melt in Mars.
Yes, I used to work in a commercial kitchen & Nacho cheese came in 10litre bags and we used a Baine Maree ( water bath) use melted butter or cling film on top to prevent a skin formimg
That depends on how hot the water is in the cup. Use the thermometer to measure it and see.
Due To high specific heat
Yes, at first it will. But it will easily come off with hot water and if you let the glass object sit with the hot water in it.
Lava is very hot- it is melted rock. Hot rock + water= steam
Heating a plastic bottle with hot water can cause chemicals to leach from the plastic into the water, potentially contaminating it. This can be harmful if these chemicals are consumed. It is generally not recommended to heat plastic bottles as a safety precaution.
The industrial shaping of melted plastic is almost exclusively done in molds. The process is called injection molding. A screw drives feed stock through a heater, and the molten plastic is forced out the "business end" into molds. It is possible to mold plastic by hand, but precautions absolutely must be observed. The plastic is hot and the fumes given off by hot plastic are toxic. Additionally, heating the plastic is something that must be carefully done as you can overheat it and pyrolyze the material. You can also cause it to catch fire. If you are not at ease with any ideas here, you should not be trying to mold melted plastic. Set yourself a learning curve and get up to speed before attempting anything like this. Safety is your first mission.