The wearing away of soil and rock and the subsequent downslope movement of the fragments are called
a. erosion.
b. weathering.
c. cross-cutting.
d. deposition.
a
You might also like to view...
During a reaction, a reactant loses 4.8 × 10-28 kg of mass. How many joules of energy are released? (c = 3.0 × 108 m/s)
A) 4.3 × 10-11 J B) 1.4 × 10-19 J C) 1.6 × 10-36 J D) 5.3 × 10-45 J
What is soil additions?
What will be an ideal response?
Predict the coldest and hottest temperatures 1 foot below the earth’s surface at a location where the surface temperature may be expected to vary seasonally from 100ºF to -40ºF in a periodic fashion. When do these occur?
What will be an ideal response?
A circumferential fin with a rectangular cross section is made of mild steel has an outer diameter of 3.7 cm OD, and a thickness of 0.3 cm. An array of these circular fins 5 are attached to a circular tube with an outer diameter of 2.5 cm as shown. Cooling air blowing over the fin produces a heat transfer coefficient of 28.4 W/(m2 K). If the temperatures of the base of the fin and of the flowing air are 260°C and 38°C, respectively, numerically determine the temperature distribution in the fin and the heat transfer rate from the fin. Compare your results with those obtained by fin analysis of Chapter 2. Also, how different is the performance if the fins are made of aluminum instead?
GIVEN
- Circumferential fin of mild steel with rectangular cross section.
- Fin outer diameter (do)= 3.7 cm=0.037 m
- Fin thickness(t)= 0.3 cm =0.003 m
- Tube outer diameter (di)=2.5 cm=0.025 m
- Convection heat transfer coefficient(h c)= 28.4 W/(m2 K)
- Temperature of fin base (Tb)= 2600C
- Ambient temperature (T?)= 380C
FIND
(a) Temperature distribution in fin
(b) Rate of heat transfer in fin
(c) Difference in performance when fins are made of aluminum instead.
PROPERTIES
From Appendix 2 Table
- Thermal conductivity of mild steel(k)= 43 W/(m K)
- Thermal conductivity of Aluminum (k)=238 W/(m K)
SKETCH
