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Author Question: How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual ... (Read 35 times)

jrubin

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on: Jul 27, 2018
How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual image magnified in size by a factor of three?
 
  A) 33.3 mm
  B) 48.0 mm
  C) 38.3 mm
  D) 42.2 mm
  E) 54.4 mm

Question 2

A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s.
 
  Determine her initial moment of inertia.


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juliaf

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Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

2.3 kg  m2


jrubin

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Reply 2 on: Jul 27, 2018
Excellent

chereeb

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Reply 3 on: Yesterday
:D TYSM

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