Entropy: What is the entropy change of 450 g of water when it changes from (a) liquid to steam at its usual boiling point and (b) ice to liquid at its usual melting point? For water, LF = 0.334 MJ/kg, LV = 2.26 MJ/kg.
What will be an ideal response?
(a) 2.73 kJ/K (b) 549 J/K
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How would the values of vp for carbon dioxide gas compare to that of nitrogen gas at a given temperature?
A. vp will be larger for carbon dioxide. B. vp will be larger for nitrogen. C. vp will be equal in both cases. D. One does not have enough information to tell for sure.
John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing
up. James says it is just the reverse. Which one, if either, is correct? a. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. b. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. c. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. d. James, because both (b) and (c) above are correct. e. Neither, because the hands exert forces of equal magnitudes.
The shortest-daylight day for people in the Southern Hemisphere at latitudes greater than 30°S occurs at the
a. summer solstice. b. vernal equinox. c. winter solstice. d. autumnal equinox.
On the day of summer solstice, explain the position of Earth and the light received by each of the hemispheres
What will be an ideal response?