Title: Unit 2 Homework Assessment
Course: REEC 120 Sustainability and Renewable Energy > Section: REEC 120 Sustainability and Renewable Energy

Q: What is the time unit described by one rotation of the earth?

Q: What is the time unit described by one revolution of the earth around the sun?

Q: What is the approximate declination of the earth’s axis (within .5 degree)?

Q: When is the earth closer to the sun for us in the northern hemisphere? Winter or summer?

Q: When are the sun’s rays more directly striking the earth’s surface? Winter or summer?

Q: When energy is captured and redirected from the natural or ambient energy flows in our environment, we can say that we are using _____ forms of energy

Q: Give an example of an indirect form of solar-sourced energy technology (not PV or solar-thermal).

Q: There are two days out of each year during which there are 12 hours of daylight and 12 hours of darkness. These two days are called the _____ _____ and the _____ _____.

Q: There is one day out of each year during which daylight hours are at their singular maximum, and night time hours are at their singular minimum. This specific day is called the _____ _____.

Q: There is one day out of each year during which daylight hours are at their singular minimum, and night time hours are at their singular maximum. This specific day is called the _____ _____.

Q: The sun's energy at the start of our atmosphere is 1377W/m². When it reaches sea level, it is 1000w/m². How many kilowatts is the sun's energy at sea level?

Q: A thinking question on units and measures:

- 1 calorie in terms of food is 1000kcal.
- There are 833 kcal that make up 1kWh.
- A typical cheese burger has 550 calories, .55kcal.

How many cheese burgers are equivalent to a 60w light bulb that is one for 1 hour? (Hint: light is on for .06kWh)