Suppose you live at the North Pole. Describe the path of the Sun through your sky for each of the following days: a. the day of the spring equinox b. the day of the summer solstice c. the day of the winter solstice
What will be an ideal response?
a. On the vernal equinox, the Sun circles the sky on the horizon in 24 hours.
b. On the summer solstice, the Sun circles the sky at a constant altitude of 23.5° in 24 hours.
c. On the winter solstice, the Sun remains well below the horizon all day.
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(a) Develop an equation for the time at which the plastic (viscous) strain is equal to the elastic strain in a Maxwell solid (series spring and dashpot) subject to a stress (?) where the viscous component is Newtonian (n=1).
(b) Determine the time (t) when the plastic strain is equal to the elastic strain in quartz subject to a stress of 35 MPa at 1250 K, if the viscosity is equal to 1014 Pa·s and the elastic modulus is equal to 70×109 Pa, assuming that the quartz behaves as a Maxwell solid. (c) Determine the total strain at the time (t).
Using graphical methods, estimate the temperature distribution through the phenolic disk surrounding the silicon chip sketched in Figure 2-61. Then estimate the heat transfer per unit depth.
Which of these is not a product of plate tectonics and hot spots?
A) Hawaii B) Yellowstone and Old Faithful C) The Mid Atlantic Rift D) The Andes E) The Grand Canyon's eroded depths
A real object is place a distance d from a converging lens. The object is then moved to a distance 2d from the converging lens. Which of the following statements is false?
a. The image in the first case with the object at distance d can be the larger one. b. The image in the second case with the object at distance 2d can be the larger one. c. If both images are real, the image in the second case is smaller. d. If the image in the first case is real, the image in the second case is upright.