Which of the following best explains why water in a lake freezes from the top do

Question

Which of the following best explains why water in a lake freezes from the top down? A. From 0 degree C to 4 degree C, water has a positive coefficient of volume expansion. B. From 0 degree C to 4 degree C, water has a negative coefficient of volume expansion. C. From 0 degree C to 4 degree C, water has a positive thermal conductivity. D. From 0 degree C to 4 degree C, water has a negative thermal conductivity. On Earth, solar energy is harnessed through which type of heat transfer? A. Radiation B. Conduction C. Convection. D. Induction E. Polarization One mole of an ideal monatomic gas is taken through a three-process thermodynamic cycle. The gas starts at point A with a pressure of p_A = 7.00 atm and volume of V_A = 1.00 L. It expands isothermally to point B where the pressure is p_B = 1.00 atm. The gas next undergoes an isochoric process to point C, then returns to point A through an isobaric compression. 1) Find the temperature of the gas at point B. 2) Find the volume of the gas at point C. 3) Find the total work for one complete cycle.

Explanation / Answer

1) which of the following best explains why water in a lake freezes from the top down ?

Ans. (A) From 0 degrees C To 4 degrees C water has a positive coefficient of volume expansion

2) On earth solar energy is harnessed through which type of heat transfer ?

Ans. (A) Radiation

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