The difference in temperatures between ice age and non-ice age climate is less than 20 °C
What will be an ideal response?
A difference of 20 °C is a big, big temperature difference. It is true that there is
evidence for swings i temperature of this great an amount, but most models of ice ages
suggest that the difference is just a few degrees in the mid-latitudes and perhaps 8 to 10 °C
near the pole (see References 15).
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A 400-g piece of metal at 120.0°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is measured to be 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? The specific heat of water is 4190 J/(kg?K). A) 1470 J/(kg ? K) B) 2830 J/(kg ? K) C) 3420 J/(kg ? K) D) 3780 J/(kg ? K) E) 4280 J/(kg ? K)
If the current in an inductor is doubled, by what factor is the stored energy multiplied?
1.4 2.2 3.1 4.1/2 5.1/4
John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct?
a. They are both wrong. b. John is correct, but Linda is wrong. c. John is wrong, but Linda is correct. d. They are both correct. e. They are free to redefine density as they wish.
Two ice skaters push off against one another starting from a stationary position
The 45.0-kg skater acquires a speed of 0.375 m/s. What speed does the 60.0-kg skater acquire? Assume that any other unbalanced forces during the collision are negligible. A) 0.500 m/s B) 0.281 m/s C) 0.375 m/s D) 0.750 m/s E) 0.000 m/s