no
NO The radio will actually run at about 6 volts via an internal transformer. If you plug it into a 110v supply you will only produce 3 volts which is the same as trying to run it with flat batteries. The only way is to use a 110v to 240v transformer which will be rather large, cumbersome and heavy.
There is a difference. For one thing, Australia works at 50hz and America at 60hz, and in domestic supply, Australia works at 240v and America at 110v.
You need a step-up transformer, to go from 110 to 220-240 volts. Then a 110 volt supply can operate 240 volt equipment.
Using a box that is hire voltage than what you need can cause a short, and even a fire. So using a 240V box, when all you need is a 110v receptacle, wouldn't be a good idea.
One word: KABOOM.
No
It would be better if you got a transformer and stepped up the voltage.
No. If the heaters are designed for 220V they cannot fun off of 110V. Also running a 1500W heater off of 110V would require a dedicated circuit. So four 1500W heaters would require 4 dedicated 110V circuits.
If you are just buying speakers then they do not connect directly to a mains supply. Therefore, as long as they are connected to an amplifier with a suitable speaker output, they will work with no problem. On the other hand, if the speakers have an amplifier built in and are connected to the mains supply, they are unlikely to work on a 230V European supply if they are rated for a 110V supply. There are some exceptions to this such as multi voltage power supplies for example. If you are not 100% sure, assume that they will not work and avoid damage and personal injury.
Yes, you need a transformer
No, it requires a 180 Volt supply. Most appliances work +/- 10%, in this case 162 Volts to 198 Volts. I would question whether your appliance is really 180 Volt. No country uses this as domestic supply, it is usually 110V or 220-240V.
No. Trying this will likely destroy the tool and may likely cause injury. The plugs are made differently to prevent them from being connected to incorrect power sources.