The operation of a cloud chamber relies on
A) magnetization.
B) evaporation.
C) acceleration.
D) polarization.
E) condensation.
Answer: E
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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
The ________ is (are) the hot gases that are the moving extension of the Sun's corona
a. spicules b. prominences c. flares d. supergranules e. solar wind
Which of the following sound frequencies lie(s) in the audible range?
a. 26 Hz b. 27 kHz c. 1 MHz d. All of these
A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J