A fan is turned off, and its angular speed decreases from 10.0 ...

[daltonest1984]

A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the angular acceleration of the fan?
 
  A)
 
  0.86 rad/s2
 
  B)
 
  0.74 rad/s2
 
  C)
 
  0.37 rad/s2
 
  D)
 
  11.6 rad/s2
 
  E)
 
  1.16 rad/s2

Question 2

330 g of water at 55C are poured into an 855 g aluminum container with an initial temperature of 10C. The specific heat of aluminum is 900 J/(kgK).
 
  What is the final temperature of the system, assuming no heat is exchanged with the surroundings?
  A)
 
  28C
 
  B)
 
  39C
 
  C)
 
  31C
 
  D)
 
  33C
 
  E)
 
  35C

[mceravolo]

Answer to Question 1

B

Answer to Question 2

B

[daltonest1984]

Excellent

[Perkypinki]

TYSM