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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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 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).
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)
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