The low ductility and low melting temperature of magnesium alloys results in many parts being _________into shape.
Fill in the blank(s) with the appropriate word(s).
cast
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A megaparsec (Mpc) is equal to _____
A) 3.3 thousand ly B) 3.3 million ly C) 3.3 billion ly D) 3.3 trillion ly
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
Acetone is rubbed on a steel roller, 4 cm in diameter by 40 cm long, to clean it. Air at 25ºC is blown over the roller at 5 m/s. If the density of acetone vapor is 0.778 kg/m^3, estimate the rate of evaporation of acetone into the air. The viscosity of acetone may be taken as 0.01 g/m?s.
What will be an ideal response?
A student calculates the momentum of a body moving at a relativistic speed by multiplying the rest mass by the velocity. This gives a result for the momentum that is
A. too large. B. too small. C. correct.