A dispersion-strengthened cutting tool will be made of a 80 vol % commercial purity nickel matrix and 20 vol % synthetic diamond. Nickel has an elastic modulus, given in Table 6.1, of 200 GPa and a tensile fracture strength of 400 MPa, and synthetic diamond has an elastic modulus of 900 GPa and a tensile fracture strength of 1000 MPa. Estimate the tensile strength and elastic modulus of this alloy.
What will be an ideal response?
The tensile strength is estimated as
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Two parallel plates of infinite extent perpendicular to the page are situated relative to each other as shown in the figure. The upper plate is at 300°C and the lower plate is at 100°C. Determine the net rate of radiation heat transfer from the upper and lower plate assuming the environment is at a temperature below 100°C. Assume that both the lower surface of the upper plate and the upper surface of the lower plate are black.
GIVEN
• Two parallel plates of infinite extent perpendicular to the page.
• Upper plate temperature (T2) = 3000C
• Lower plate temperature (T1)= 1000C
• Length of the plates L1 = L2 = 2 m
• Distance between the plates (R) = 1 m
FIND
(a) Net rate of radiation heat transfer from upper and lower plate.
ASSUMPTIONS
• Lower surface of upper plate and upper surface of lower plate are black.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A scientific model is a mental conception that provides a framework that helps us think about some aspect of nature
Indicate whether the statement is true or false
The scientific method is a ___________________ by which scientists form hypotheses and test them agains evidence gathered by observation or experiment
Fill in the blank(s) with correct word
The circuit below contains three 100-watt light bulbs and a capacitor. The emf ? = 110V. The capacitor is fully charged. Which light bulb(s) is(are) dimmest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright (or dim).