Elements have similar chemical properties because they have the same number of electrons in their ______________
Fill in the blank(s) with correct word
valence shells, or outer shells
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An ideal gas is at a temperature of 40
and a pressure of 2.00 atmospheres. If the diameter of an N2 molecule is 0.300 nm, then what is the mean free path of the N2 molecule in the gas?
a. 
b. 
c. 
d. 
e. 
A guitar string 0.650 m long has a tension of 61.0 N and a mass per unit length of 3.00 g/m. (a) What is the speed of waves on the string when it is plucked? (b) What is the string's fundamental frequency of vibration when plucked?
What will be an ideal response?
A 13,000-N vehicle is to be lifted by a 25-cm diameter hydraulic piston. What force needs to be exerted on a 5.0 cm diameter piston to accomplish this? Assume the pistons each have negligible mass
A) 260 N B) 520 N C) 2600 N D) 5200 N
A 2.5-cm-OD hot steam line at 100°C runs parallel to a 5.0-cm-OD cold water line at 15°C. The pipes are 5 cm center to center and deeply buried in concrete with a thermal conductivity of 0.87 W/(m K). What is the heat transfer per meter of pipe between the two pipes?
GIVEN
Hot pipe outside diameter (Dh) = 2.5 cm = 0.025 m
Hot pipe temperature (Th) = 100°C
Cold pipe outside diameter (Dc) = 5.0 cm = 0.05 m
Cold pipe temperature (Tc) = 15°C
Center to center distance between pipes (l) = 5 cm = 0.05 m
Thermal conductivity of concrete (k) = 0.87 W/(m K)
FIND
The heat transfer per meter of pipe (q/L)
ASSUMPTIONS
Two dimensional heat transfer between the pipes
Steady state conditions
Uniform thermal conductivity
SKETCH
