In a phase diagram, the _____________line gives the temperature where the first solid forms upon cooling an alloy of given composition C0 from the liquid phase.
Fill in the blank(s) with the appropriate word(s).
liquidus
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An egg, which for the purposes of this problem can be assumed to be a 5-cm-diameter sphere having the thermal properties of water, is initially at a temperature of 4°C. It is immersed in boiling water at 100°C for 15 min. The heat transfer coefficient from the water to the egg may be assumed to be 1700 W/(m2 K). What is the temperature of the egg center at the end of the cooking period?
GIVEN
An egg is immersed in boiling water
Initial temperature (To) = 4°C
Temperature of boiling water (T?) = 100°C
Time that the egg is in the water (t) = 15 min. = 900 s
The heat transfer coefficient (hc) = 1700 W/(m2 K)
FIND
The temperature of the egg center at the end of the cooking period
ASSUMPTIONS
The egg is a sphere of diameter (D) = 5 cm = 0.05 m
The egg has the thermal properties of water
SKETCH
You would like to know the chemical composition of a star's atmosphere. Therefore you will need to obtain the star's ______________ spectra
Fill in the blank(s) with correct word
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing downward through it. What will happen to the wire?
a.
The wire will be forced toward the north pole.
b.
The wire will be forced perpendicular to the plane of the magnetic field, into the page.
c.
The wire will be forced perpendicular to the plane of the magnetic field, out of the page.
d.
The current will cease flowing.
e.
The wire will be forced toward the south pole.
Three resistors of 12, 12, and 6.0 ? are connected in series. A 12-V battery is connected to the combination. What is the current through the battery?
A) 0.10 A B) 0.20 A C) 0.30 A D) 0.40 A E) 0.50 A