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Author Question: A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no ... (Read 181 times)

bio_gurl

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on: Jul 29, 2018
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no air?
 
  A) 9.8 m/s upward
  B) 9.8 m/s downward
  C) 0 m/s
  D) 19.6 m/s downward

Question 2

Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 m in diameter.
 
  Treating dust as an ideal gas, what is the root-mean-square speed (thermal speed) of a dust particle at 400C? (The Boltzmann constant is 1.38  10-23 J/K.) A) 5.2  10-5 m/s
  B) 1.7  10-5 m/s
  C) 3.0  10-5 m/s
  D) 7.3  10-5 m/s


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lcapri7

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

B

Answer to Question 2

A


bio_gurl

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Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

bulacsom

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Reply 3 on: Yesterday
Wow, this really help

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