For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system's
A) frequency.
B) acceleration.
C) period.
D) amplitude.
Ans: D) amplitude.
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including a contact resistance of 0.1 K/W at each of the interfaces. but assume that instead of surface temperatures, the given temperatures are those of air on the left and right sides of the wall and that the convective heat transfer coefficients on the left and right surfaces are 6 and 10 W/(m2K), respectively.
GIVEN
• Composite wall
• Thermal conductivities
? kA = 70 W/(m K)
? kB = 60 W/(m K)
? kC = 40 W/(m K)
? kD = 20 W/(m K)
• Air temperatures
? Left side (TA?) = 200°C
? Right side (TD?) = 50°C
• Contact resistance at each interface (Ri) = 0.1 K/W
• Convective heat transfer coefficients
? Left side ( cA h ) = 6 W/(m2 K)
? Right side ( cD h ) = 10 W/(m2 K)
FIND
(a) Rate of heat transfer through the wall (q) (b) Temperatures at the interfaces
ASSUMPTIONS
• One dimensional, steady state conduction
SKETCH
Define the solar constant
What will be an ideal response?
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a ? m/s2, v ? m/s, x ? m , t ? s)
A) x = v/t B) v = 2ax C) t2 = x/a D) x2 = 2av E) x = a t
You observe a rocket moving away from you. Compared to the passage of time measured by the watch on your wrist, the passage of time on the rocket's clock is
1.faster. 2.slower. 3.the same.