In a Young's double-slit experiment, how many maxima occur between the 5th-order maxima?
a. 8
b. 9
c. 10
d. 25
e. Three more than the number of minima.
b
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Suppose the average thermal speed of molecules in a gas at room temperature (22°C) is 
. If we “double” the gas’s temperature (to 44°C), what is the average molecular speed now? Select the closest response.
A. About the same
B. 
C. 
D. 
E. 
Measuring the amount of deuterium in the universe allows us to set a limit on ________
A) the acceleration of the universe B) the total amount of mass in the universe C) the density of ordinary (baryonic) matter in the universe D) the current age of the universe
When one kilogram of uranium undergoes nuclear fission,
A) the total amount of rest-mass is conserved. B) the total amount of energy is conserved. C) Both of the above. D) Neither of the above.
A 1.4-kg aluminum household iron has a 500 W heating element. The surface area is 0.046 m2. The ambient temperature is 21°C and the surface heat transfer coefficient is 11 W/(m2 K). How long after the iron is plugged in will its temperature reach 104°C?
GIVEN
• An aluminum household iron
• Mass of the iron (M) = 1.4 kg
• Power output ( Q
G ) = 500 W
• Surface area (As) = 0.046 m2
• The ambient temperature (T?) = 21°C
• The heat transfer coefficient ( )ch = 11 W/(m2 K)
FIND
• How long after the iron is plugged in will its temperature reach 104°C
ASSUMPTIONS
• Constant heat transfer coefficient
• The mass given is for the heated aluminum portion only
SKETCH
