A turntable was revolving at 33 1/3 rpm. It was shut off and uniformly slowed down and stopped in 5.5 seconds
(a) What was the angular acceleration?
(b) Through how many revolutions did it turn?
(a) -0.10 rev/s2 = -0.63 radians/s2
(b) 1.5 revolutions
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A sample of 
has a mass of 50.0 grams. What is number of molecules of carbon dioxide in the 50.0 gram sample? (C = 12.0u, O = 16.0u)
A. 
B. 
C. 
D. 
E. 
Calculate the rate of heat transfer through the composite wall in the temperature difference is 25°C and the contact resistance between the sheets of wood is 0.005 m2 K/W
GIVEN
• Wood wall
? Two layers 0.025-m-thick each, nailed together
• Nail cross sectional area of nails = 0.5% of wall area
• Temperature difference (?T) = 20°C
• Contact resistance (A Ri) = 0.005 (m2 K)/W FIND
• The rate of heat transfer through the wall
ASSUMPTIONS
• One dimensional heat transfer through the wall
• Steady state prevails
SKETCH
PROPERTIES AND CONSTANTS
? Wood (Pine) (kw) = 0.15 W/(m K)
? Mild steel (1% C) (ks) = 43 W/(m K)
What space shuttle put the hubble into orbit?
What will be an ideal response?
Silicates are minerals that have the oxygen and silicon ______________ as their basic structure
Fill in the blank(s) with correct word