Students who did not pick up their quizzes on Friday Feb. 17 had to turn in written answers to the following questions before receiving their questions.

1. _______ of the sunlight energy arriving at the earth is ultraviolet light.

a. very little (<10%) b. about half (40 to 60%) c. most (>90%)

2. Essentially all of the UV-A UV-B UV-C UV-D , the most dangerous form of ultraviolet light is absorbed by the earth's ozone layer.

3. Which two of the following would be examples of kinetic energy? 

a. rotating winds in a tornado

b. moving atoms or molecules in air

c. energy hidden in water vapor

d. sunlight traveling through empty space

4. Electromagnetic radiation accounts for 100% of the energy traveling to and from the earth through space and 80% of the energy flowing back and forth between the earth's surface and atmosphere. Which of the following is the 2nd most important energy transport process?

a. conduction b. convection c. convergence d. latent heat

5. 500 calories of energy are added to 100 grams of a material with a specific heat of 0.4 calories/gram ^oC. How much will the material warm up?

6. A cup containing 250 grams of coffee cools from 82^o C to 62^o C. How much energy did the coffee lose? (assume that the specific heat of coffee is the same as that of water, 1 calorie/gram ^oC.

7. A city along a coastline will probably have WARMER COLDER summer temperatures and WARMER COLDER winter temperatures than a city at the same altitude and latitude that is further inland.

8. Temperature provides a measure of the TOTAL AVERAGE kinetic energy of the atoms or molecules in an object.

9. A reasonable average surface temperature for the earth is 100^o C 200^o F 300^o K.

10 The coldest temperature ever recorded on the earth was -129^o F. The hottest temperature ever recorded in the US was 134^o F, just 2^o F short of the world record.