# homework set 2

Homework Set 2

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You will now complete the following homework problems from your textbook Conceptual Integrated Science:

•         Page 144, #48
•         Page 175, #53
•         Page 207, #12 and #19
•         Page 851, #45
•         Page 893, #5 and #6

Submit your answers in a Word document to the Dropbox no later than Sunday 11:59 PM EST/EDT

Page 144, #48 If you wish to warm 100 kg of water by 20°C for your bath, show that 8370 kJ of heat is required.

Page 175, #53. Show that it costs \$3.36 to operate a 100 W lamp continuously for a week if the power utility rate is 20¢/kWh.

Page 207, #12. What is the principal difference between a radio wave and light? between light and X-rays?

Page 207, #19. What is the relationship between the frequency of light and its color?

Page 851, #45. Knowing that the speed of light is 300,000 km/s, show that it takes about 8 min for sunlight to reach Earth.

Page 893, #5. Which is hotter, a red star or a blue star?

Page 893, #6. What is the difference between apparent brightness and luminosity?

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