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Author Question: A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and ... (Read 71 times)

ereecah

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on: Jul 29, 2018
A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy-efficient is this bulb as a producer of light?
 
  A) 400 B) 20 C) 25 D) 500 E) 80

Question 2

A 3.0-kg object and a 5.0-kg object hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the objects are gently released from rest, how long does it take for the 3.0-kg objects to rise by 1.0 m?
 
  A) 0.41 s
  B) 0.74 s
  C) 0.82 s
  D) 1.8 s
  E) 0.90 s


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GCabra

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

E


ereecah

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Reply #2 on: Jul 29, 2018
TY


GCabra

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Reply #3 on: Jul 29, 2018
You're welcome


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