Q1. What would be the equilibrium temperature when a 256 g block of copper at 314 °C is placed in a 140 g aluminium calorimeter cup containing 827 g of water at 11.5 °C?
Q2. A street lamp weighs 145 N. It is supported equally by two wires that form an angle of 120° with each other.
What is the tension of each of these wires?
If the angle between the wires is condensed to 90.0°, what new force does each wire exert?