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Author Question: In order to quadruple an object's kinetic energy, we must A) double its speed. B) double its ... (Read 64 times)

chads108

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on: Jul 29, 2018
In order to quadruple an object's kinetic energy, we must
 
  A) double its speed.
  B) double its height
  C) stretch it twice as far.
  D) quadruple its height.
  E) quadruple its speed.

Question 2

The center of our galaxy is 30,000 light years away. Could a person possibly travel there in her own lifetime?
 
  A) No, because a person cannot travel at lightspeed.
  B) No, because the trip would take longer than 30,000 years, and nobody lives this long.
  C) No, because time dilation applies only to clocks and not to biological phenomena such as a person's lifetime.
  D) Yes, by traveling at nearly lightspeed, because of time dilation or the relativity of time.
  E) Yes, by traveling faster than lightspeed, because of time dilation or the relativity of time.


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Sarahjh

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

A

Answer to Question 2

D


chads108

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Sarahjh

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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