The fan will physically get warmer and the blade speed will increase.
No
Yes, but it may generate more harmonics
nothing
One way would be to hook it up to a supply (by itself, with no load) and measure the speed with a contact tachometer. If your supply is 60Hz, and the motor speed corresponded to one of the standard motor speeds, it would be a pretty safe bet you had a 60Hz motor. If the speed was about 20% faster than a standard speed, the motor is probably a 50Hz motor. Or 20% slower if you were running a 60Hz motor on 50Hz For instance, a 1750 RPM 50Hz motor would spin at about 2100 RPM if you ran it on 60Hz.
Your stereo system has an internal transformer in the power supply that is designed to operate at a given frequency. If it is designed to operate at the load your stereo system will use at 50 Hz, then yes. Otherwise this transformer will overheat when connected at the wrong frequency, and will burn out. You might be lucky and the power supply may be labelled to operate at 50 or 60Hz; if not, I recommend contacting the manufacturer. A voltage transformer will convert 50Hz 220 to 50Hz 110. To change frequency, you need special equipment.
iMacs can operate on a power supply ranging between 100-240V AC (50Hz to 60Hz, single phase frequency) which means they will work in most countries. An adapter may be required to connect to the local power supply.
No. Australia's electricity supply is 230 volts at 50Hz... america's is 120 volts at 60Hz.
No 50Hz
What effect will be there on the motor (Induction) output power when a 100kW 50hz motor is connected to a 60hz power supply.
Most likely, yes. Most devices has been manufactured with an idea that they will be used in areas where the supply power frequency is 50 or 60Hz.
10HZ. Enjoi!