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Author Question: Two mirrors are joined together along a common side, the planes of the mirrors separated by the ... (Read 85 times)

mrsjacobs44

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on: Jul 28, 2018
Two mirrors are joined together along a common side, the planes of the mirrors separated by the angle q. If the joined mirrors can be used as a retroreflector when a beam of light strikes both surfaces (one after the other), what is the value of q?
 a. 90
  c. 45
  b. 135
  d. 30

Question 2

A solar heated house loses about 7.4  107 cal through its outer surfaces on a typical 24-hour winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62C by the solar collectors, and the house is maintained at 20C? (Specific heat of rock is 0.21 cal/g  C.)
 a. 160 kg
  c. 6100 kg
  b. 1200 kg
  d. 8400 kg


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ilianabrrr

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

D


mrsjacobs44

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Reply 2 on: Jul 28, 2018
Excellent

pratush dev

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Reply 3 on: Yesterday
Wow, this really help

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