Q1. The front of her sleeper wet from teething, a baby rejoices in the day by crowing and bouncing up and down in her crib. Her mass is 14.0 kg, and the crib mattress can be modelled as a light spring with a force constant 4.70 kN/m. She learns to use the mattress as a trampoline -- losing contact with it for part of each cycle -- while her amplitude exceeds what value?
Q2. If she is served 200 of coffee at 84 in a well-insulated container, how much ice at 0 should she add to obtain a final temperature of 31?