A person consumes 2 200 kcal/day while expending 3 200 kcal/day. In a month's time, about how much weight would this person lose if the loss were essentially all from body fat? (Body fat has an energy content of about 4 100 kcal per pound.)
a. 15 pound
b. 22 pounds
c. 7.3 pounds
d. 3.7 pounds
e. 29 pounds
c
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Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F
Six months later the temperature has dropped to -2.°F. How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94 ? b. 0.81 ? c. 0.58 ? d. 0.69 ? e. 1.5 ?
Not much possibility remains to increase use of mill residues of forest products, but much remains to be gained from use of logging residues
What will be an ideal response?
A top is set spinning so that the rotation is counterclockwise around its axis when viewed from above. When the top is placed on a level surface it happens that its axis of rotation is not quite vertical. Viewed from above, which way does the rotational axis of the top precess?
a. clockwise b. counterclockwise c. It's random, if it starts clockwise it will continue clockwise, and vice versa, i.e., a 50% chance either way. d. The direction depends on the little shove given to the axis when the top is placed on the surface. e. In the northern hemisphere it will be clockwise, in the southern hemisphere it will be counterclockwise.