Q1. A 630 N student stands on a scale in an elevator. As the elevator starts to move, the scale reads 750 N.

a. Find the acceleration.

b. Is the elevator going up or down?

Q2. An insulated Thermos contains 145 cm3 of hot coffee at 89.0 °C. You put in an 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat coffee although it was pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.