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Author Question: A pencil, 15.7 cm long, is released from a vertical position with the eraser end resting on a table. ... (Read 129 times)

savannahhooper

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on: Jul 29, 2018
A pencil, 15.7 cm long, is released from a vertical position with the eraser end resting on a table.
 
  The eraser does not slip. Treat the pencil like a uniform rod. What is the angular speed of the pencil just before it hits the table?
  A) 17.2 rad/s
  B) 7.23 rad/s
  C) 3.70 rad/s
  D) 24.5 rad/s
  E) 16.8 rad/s

Question 2

An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at t = 0 s. Which of the following is a correct statement regarding this circuit?
 
  A) The charge on the capacitor after four time constants is about 98 of the maximum value.
  B) The charge on the capacitor after one time constant is about 25 of its maximum value.
  C) The charge on the capacitor after one time constant is about 50 of its maximum value.
  D) The voltage on the capacitor after two time constants is about 14 of the maximum value.
  E) The voltage on this capacitor after two time constants is about 100 of its maximum value.


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Dominic

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

A

Answer to Question 2

A


savannahhooper

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Reply #2 on: Jul 29, 2018
Thank you!


Dominic

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Reply #3 on: Jul 29, 2018
Always glad to help...


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