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Author Question: A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is ... (Read 98 times)

jc611

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on: Jul 28, 2018
A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is the mass of the boat? (b) What is the acceleration? (c) How large is the net force acting on the boat?

Question 2

Which of these is a strong circumstantial indication that gravity waves exist?
 a. A supernova occurs on an average once every 15 years in the Galaxy.
  b. Objects fall down on Earth, not up.
  c. Orbiting neutron stars lose speed at a rate that fits a gravity wave theory.
  d. The trajectory of electrons ejected from nuclei fits a gravity wave theory.
  e. The slight changes in Earth's motion, requiring an extra leap second added onto the year 2005.


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raenoj

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

(a) 500 kg, (b) 4 m/s2, (c) 2,000 N

Answer to Question 2

c


jc611

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Reply 2 on: Jul 28, 2018
Gracias!

carojassy25

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Reply 3 on: Yesterday
Excellent

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