If the insolation upon a flat plate collector is 800 Btu/ft2/day, ...

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If the insolation upon a flat plate collector is 800 Btu/ft2/day, how large must the collector be to provide 30,000 Btu/hr of thermal energy for an entire day? Take the efficiency of the collector to be 50.
 a. 150 b. 750 c. 1800 d. 4000 e. 7200 ft2

Question 2

You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
 a. your hand is there: your hand exerts no force on the ball.
  b. your hand exerts a force on the ball perpendicular to its velocity.
  c. your hand exerts a force on the ball in the direction of its velocity.
  d. your hand exerts a force on the ball in the direction opposite to its velocity.
  e. your hand and the ball exert forces in the same direction on each other.

[31809pancho]

Answer to Question 1

c

Answer to Question 2

D

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