Question1
A small immersion heater can be used to heat a cup of water for coffee or tea. If the heater can heat 180mL from 27 C to 94C in 12 min, approximately how much current does it draw from the car's 12-V battery? Suppose 70 percent efficiency.
Question2
A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If center of the target is level with the rifle, how high above the target have to the rifle barrel be pointed so that the bullet hits dead center?