Question

1. You want to freeze some homemade popsicles. You pour 0.24 kg of juice at room temperature (21 °C) into an ice cube tray in your freezer, which has a temperature of -17 °C. The specific heat capacity of juice is 4186 J/kg C°. The latent heat of fusion for juice is 33.5 x 10⁴ J/kg.
   1. How much energy do the popsicles release as they cool from room temperature to 0 °C?
   2. How much energy is released due to freezing the entire set of popsicles?
   3. You remove one popsicle from the freezer and allow it to come to a temperature where it just starts melting. Your body releases approximately 3 x 10⁵ J of energy every hour. How much of a frozen popsicle’s mass would be melted if you held it in your hands for two minutes after it just started to melt? For this problem, we’ll estimate that 2% of the energy your body releases can be transferred from your hands to the popsicle. (Hint: first, find the amount of energy your body releases in two minutes.)

Answer 1