What do we mean by "life as we know it"?
What will be an ideal response?
Our life is based on chains of carbon atoms with DNA, RNA, and proteins formed out of amino acids and nucleotides. Life as we know it depends on liquid water as its medium. It's possible other atoms may also be suitable for life to be based on, which would be radically different from ours.
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Four coins, each with a Head and a Tail, are tossed randomly on to a table. The microstate is defined as the "number of Heads showing". The number of Heads can be, 0, 1, 2, 3, 4. What value for the "number of Heads showing" has the greatest number of microstates?
A. 0 B. 1 C. 2 D. 3 E. 4
What other population of stars are relatively old?
A.) Open clusters. B.) OB associations. C.) Globular clusters. D.) Blue clusters. E.) Superclusters.
The beam of electrons that hits the screen of an oscilloscope is moved up and down by:
a. varying the electron's charge. b. electrical charges on deflecting plates above and below the beam. c. gravity. d. a phosphorescent coating.
It is a well-known physiological phenomenon that some materials feel cooler to the touch than others. This is important in the design of instruments for the use of operators, especially in a space station. Experiments conducted at NASA have shown that different materials, e.g., aluminum and plastic, though in identical size and temperature feel very different to the touch. Consider two plates, one made of aluminum and the other of plastic, each at an initial temperature of 25°C. Determine which of the two will feel hotter to the touch of your finger if it is initially at 32°C. Assume that your finger has a density of 1000 kg/m3, specific heat of 4180 J/(kg K), and thermal conductivity of 0.625 W/(m K). Also, properties of aluminum are given in, and plastic is considered to have a
density of 1990 kg/m3, specific heat of 1470 J/(kg K), and thermal conductivity of 0.21 W/(m K).
GIVEN
FIND
which of the aluminum or plastic feel hotter to touch to your finger.
ASSUMPTIONS
constant thermal properties
Negligible contact resistance
The finger and plate behave as semi infinite solid.
SKETCH
