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Author Question: A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70 meter mark. (a) What is ... (Read 53 times)

Alainaaa8

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on: Jul 28, 2018
A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70 meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?

Question 2

Which is a key difference between electric charges and magnetic poles?
 a. Electric charges can be separated while magnetic poles always occur together as opposite poles of equal strength.
  b. Magnetic monopoles exist but isolated electric charges are never found.
  c. Like electric charges repel but like magnetic poles attract.
  d. An electrically charged rod attracts an electrically neutral object but a magnet does not attract and unmagnetized chunk of iron.
  e. In electricity, unlike charges repel, but in magnetism, unlike poles attract.


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fur

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Reply #1 on: Jul 28, 2018
Answer to Question 1

1 m/s, 9 m, 3.6 s

Answer to Question 2

a


Alainaaa8

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Reply 2 on: Jul 28, 2018
YES! Correct, THANKS for helping me on my review

xiazhe

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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