Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
a. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface.
b. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface.
c. Angela, because the inner circumference does not change, but the outer circumference expands.
d. Clarissa, because the inner circumference does not change, but the outer circumference expands.
e. Neither, because both the inner and outer circumferences increase in length.
e
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A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10 cm thickness is 20 W/m2 . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in
IVEN
• Concrete wall
• Thickness (L) = 100 cm = 0.1 m
• Heat loss (q/A) = 20 W/m2
• Surface temperature
? Inner (Ti) = 22°C
? Outer (To) = 6°C FIND
• The thermal conductivity (k) and compare it to the tabulated value
ASSUMPTIONS
• One dimensional heat flow through the wall
• Steady state conditions exist
SKETCH
Which of the following statements is true?
A) an atom is the smallest particle known to exist B) there are only about 100 different kinds of atoms that combine to form all substances C) there are thousands of different kinds of atoms that account for a wide variety of substances D) a large atom can be photographed with the aid of an ordinary microscope E) none of the above
If astronauts could travel at v = 0.90c, we on Earth would say it takes (4.2/0.90) = 4.7 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 2.0 years c. 1.4 years b. 2.4 years d. 3.0 years
Evidence that the cosmic background radiation really is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Bang and comparing these predictions with observations
Four of the five statements below are real. Which one is fictitious? A) The cosmic background radiation is expected to have a temperature just a few degrees above absolute zero, and its actual temperature turns out to be about 3 K (actually 2.7 K). B) The cosmic background radiation is expected to have a perfect thermal spectrum, and observations from the COBE spacecraft verify this prediction. C) The cosmic background radiation is expected to contain spectral lines of hydrogen and helium, and it does. D) The cosmic background radiation is expected to look essentially the same in all directions, and it does. E) The cosmic background radiation is expected to have tiny temperature fluctuations at the level of about 1 part in 100,000. Such fluctuations were found in the COBE data.