Question

2. Consider a sample of helium gas at room temperature. (a) What is the average kinetic energy of an atom of helium in the gas sample? (b) What is the rms speed for the atoms? 3. A beaker with negligible mass contains 0.50 kg of water at a temperature of 800 C. How many grams of ice at a temperature of -20° C must be dropped in the waters temperature of the system is 30° C? (Cice 2010J/(kg C), Cwater 4190 J/(kg C0), LF 3.33 x 10% J/kg) 4. What power is drawn by a coffee maker in bringing two cups of water to a boil in five minutes? Assume the water starts at room temperature. For comparison a cyclist can main- taina 572 W maximum output for 4 minute jap physiology org/ g content/full/89/4/1522#F1 5. A glass temperature difference between its surfaces is 25.0 Co, what is the rate of energy transfer by conduction through the window? (kglas -0.8 W/(m Co)) o that the final window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the

Answer 1

2. Averae Kinetic eurg Kinetic eGras 8-31x 298 6.022 Xlo 2 2 I O b) 2 k - 21 | 2x 6-17 X 10. 0.664 x 1626 = Vrms