The ________ of a body decreases as it is moved away from the surface of the Earth.
Fill in the blank(s) with the appropriate word(s).
weight
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Within the mantle, how is heat transported outward away from the core?
A. differentiation B. radiation C. convection D. subduction E. conduction
Quenching is a rapid cooling process by which many metallic alloys are hardened. Brass (a copper alloy: 70 Cu, 30 Zn) plates that are 4 mm thick are quenched in a water bath at a heat treating plant. If a brass plate is initially at 4500C determine the quench time needed for the plate to attain 900C. The water bath temperature is 800C and has an average convective heat transfer coefficient of 45 W/(m2 K), determine how long the plate has to remain in the oven.
GIVEN
Brass alloy plate of thickness L=4 mm=0.004 m
Initial temperature of the plate (To) = 450°C
Water bath temperature (T?) = 80°C
Convective heat transfer coefficient ( ch ) = 45 W/(m2 K)
FIND
The quench time required for the plate to reach 900C.
ASSUMPTIONS
Constant thermal conductivity
End effects are negligible
SKETCH
For every two trips around the Sun, Mercury only spins about its rotational axis three times.
Answer the following statement true (T) or false (F)
_____ is proposed dark matter made up of particles other than protons and neutrons
A) Baryonic matter B) Biotic matter C) Nonbaryonic matter D) Abiotic matter