The operation of a cloud chamber relies on

A) magnetization.
B) evaporation.
C) acceleration.
D) polarization.
E) condensation.


Answer: E

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science