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Author Question: A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and ... (Read 67 times)

imanialler

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on: Jul 29, 2018
A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing.
 
  (a) During this landing maneuver, what must be the thrust due to the rocket's engines?
  (b) What must be the direction of the engine thrust force?

Question 2

A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
 
  A) 0.350
  B) 0.650
  C) zero
  D) 0.200
  E) The answer depends on which edge of the board is vertical.


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phuda

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

(a) 1300 N (b) upward

Answer to Question 2

B


imanialler

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

Joy Chen

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

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