The position of a mass that is oscillating on a spring is given ...

[saliriagwu]

The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos(1.26s-1)t. What is the acceleration of the mass when t = 0.825 s?
 
  A)
 
  9.89 cm/s2
 
  B)
 
  -9.89 cm/s2
 
  C)
 
  10.6 cm/s2
 
  D)
 
  -10.6 cm/s2
  E)
 
  0 cm/s2

Question 2

By what primary heat transfer mechanism does one end of an iron bar become hot when the other end is placed in a flame?
 
  A)
 
  natural convection
  B)
 
  conduction
  C)
 
  radiation
  D)
 
  forced convection
  E)
 
  countercurrent.

[Gabe]

Answer to Question 1

B

Answer to Question 2

B

[saliriagwu]

Both answers were spot on, thank you once again

[Gabe]

Great! Please up vote