The radius of the Earth is r. A satellite of mass 100 kg is at a point 3r above the Earth's surface. What is the satellites' weight?
A. 6.3 N
B. 110 N
C. 61 N
D. 38 N
C. 61 N
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A heat sink made of an array of fins that have a straight, rectangular cross section is used to cool an electronic micro-chip module, as schematically shown in the figure. The heat sink (base and fins) is made of copper, and each fin is 3 mm thick and 30 mm long. If the fin-base temperature is 85°C and the cooling air is at 25°C with an average convective heat transfer coefficient of ch =100 W/(m2 K), determine the temperature distribution in one fin and the rate of heat transferred per unit width of the fin. If the fins are made of aluminum instead, what is the change in the rate of heat dissipated by the aluminum fin of same thickness? For the numerical analysis, in both the cases, consider a minimum of 11 nodes from the base to tip and convective heat transfer from the fin tip.
Compare the results with the one- dimensional fin analysis
GIVEN
• Heat sink made of an arry of straight rectangular cross section fins.
• Fin base temperature (T0)= 850C
• Surrounding air temperature (T?)= 250C
• Convection heat transfer coefficient ( ch )= 100 W/(m2 K)
• Fin thickness(t)= 3 mm = 0.003 m
• Fin length (L)= 30 mm =0.03 m
• Number of nodes (N)=11
FIND
(a) Temperature distribution in one fin considering convection from fin tip
(b) Heat transfer rate per unit width of fin
(c) Rate of change in heat dissipated if Aluminum of same thickness is used.
PROPERTIES
• Thermal conductivity of copper(kCu)= 396 W/(m K)
• Thermal conductivity of Aluminum (kAl)=238 W/(m K)
SKETCH
Intense and blinding light that reduces visibility
A. Circadian Rhythm
B. Glare
C. Vincent Van Gogh
D. International Dark-Sky Association
E. Shielding
F. Sky Glow
An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m, beginning in the corner of a square classroom. It then turns exactly 90 degrees to the right, and proceeds an additional 4.00 m, reaching the far corner of the same wall from which it began. If the second leg was also crawled in half the amount of time as required for the first leg, what was the ant’s average speed for the whole trip?
A. 0.80 m/s B. 0.27 m/s C. 0.37 m/s D. 0.44 m/s
The wave functions of some molecules are a combination of wave functions with different values of the orbital quantum number . The wave function of PF5 combines s, p and d states in an sp3d hybrid orbital. We would expect such an overlap of wave functions in individual molecules to represent
a. ionic bonding b. metallic bonding. c. covalent bonding. d. Van der Waal's bonding. e. hydrogen bonding.