If a person in Alaska were locked out of his house on a day when the temperature outside was ?40°C, his thick clothing would mostly reduce the loss of thermal energy by
A. conduction.
B. convection.
C. radiation.
D. all of the above.
E. convection and radiation.
Answer: A
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Must acupuncture be responsible for the patients' recovery?
A) No. Acupuncture may be responsible for the healing, or it may not. Correlation does not necessarily imply causation. B) Yes. If the study was run by qualified M.D.s, then we should respect their findings that acupuncture cured these patients. C) No. Acupuncture is hippie, new age stuff, and is not respected by reputable doctors. D) Yes. The patients stated afterwards that they knew it had helped, and these people know their own bodies better than we do.
A soda-lime glass tube made out of the material in Figure 9.3 is in service in a chemical-processing plant at 395°C, and it is subject to a tensile stress of 10 MPa. The elastic modulus of the glass at this temperature is equal to 40 GPa. Use a Maxwell solid model to answer the following, and assume that the glass behaves as a Newtonian fluid (n=1).
(a) At the instant the glass tube is placed in service, at t=0, what is the strain of the tube? (b) After one year of service, what is the total strain of the tube?
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
Considering how small atoms are, what are the chances that at least one of the atoms exhaled in your first breath will be in your last breath?
A) Not very likely because atoms are constantly dematerializing. B) Not possible at all because atom don't last that long. C) Very probable because atoms are incredibly small. D) There's not really a way that scientists are able to make such an estimate.