1. An aluminum bar is 2 meters long at a temperature of 20 degrees celsius. What will be the length of the bar at a temperature of 100 degrees celsius?
2. A mass of 9kg is lifted through a height of 17 meters. How much work is performed during the lifting? (Please show the formula/work)
3. What is the total resistance in OHMS and what is the total current in amperes? (picture below)