What are the three sources of heat acted together to bring young Earth to its melting point
What will be an ideal response?
impact heating, gravitational contraction heating, and radioactive decay heating
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It has been proposed that highly concentrating solar power such as the one below can be used to process materials economically when it is desirable to heat the material surface rapidly without significantly heating the bulk. In one such process for case hardening low-cost carbon steel, the surface of a thin disk is to be exposed to concentrated solar flux.
The distribution of absorbed solar flux on the disk is given by
where r is the distance from the disk axis and q''max and Ro are parameters that describe
the flux distribution. The disk diameter is 2Rs, its thickness is Zs, its thermal conductivity
is k and its thermal diffusivity is a. The disk is initially at temperature Tinit and at time
t = 0 it is suddenly exposed to the concentrated flux. Derive the set of explicit difference
equations needed to predict how the disk temperature distribution evolves with time. The
edge and bottom surface of the disk are insulated and reradiation from the disk is
neglected.
GIVEN
- Steel disk exposed to concentrated solar flux
FIND
(a) Explicit difference equations that describe evolution of disk temperature
Of all the forms of electromagnetic radiation, the one with the lowest frequency is:
A) gamma rays. B) ultraviolet rays. C) visible light. D) microwaves. E) radio waves.
The density of a certain metal solid is 6.5 × 10^3 kg/m3, and its Young's modulus is 10.0 × 10^10 N/m2 . What is the speed of sound in this metal?
a. 8.1E+1 m/s b. 1.2E+3 m/s c. 3.9E+3 m/s d. 1.2E+5 m/s e. 8.1E+1 m/s
Dez pours water (n = 1.333) into a container made of crown glass (n = 1.52). The light ray in glass incident on the glass-to-liquid boundary makes an angle of 30.0° with the normal. Find the angle of the corresponding refracted ray
a. 19.2° c. 55.5° b. 34.8° d. 27.2°