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Author Question: An astronaut in a space suit has a total mass of 143.5 kg and is standing on a scale that reads in ... (Read 135 times)

jCorn1234

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on: Jul 29, 2018
An astronaut in a space suit has a total mass of 143.5 kg and is standing on a scale that reads in newtons inside an elevator. If the elevator accelerates upward at the rate of 1.8 m/s2, what does the scale read?
 a. 703.2 N b. 1,406.3 N
  c. 882.3 N d. 1,664.6 N

Question 2

Two identical airplanes are executing identical turns around a pylon. One of them is moving at 200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph.
 a. one quarter b. one half
  c. the same as d. twice
  e. four times


nyrave

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

d
RATIONALE: Fup = W + ma = (1,406.3 N) + (143.5 kg)(+1.8 m/s2) Fup = 1,664.6 N rounded to one decimal place

Answer to Question 2

e
RATIONALE: Centripetal force = mv2 / r; since v1 = 2v2 ; the force is (2)2 or 4 times as great.


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