12.1

12.2

12.3

12.4. Density = mass / volume

12.5. Elasticity

12.6

12.7

12.8

12.9

12.10

12.11

Questions -- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

) Which cooks faster in boiling oil? A)a sliced potato. B)a whole potato. C) both cook the same. 2) Tripling the linear size of an object multiplies its area by A) 3 and its volume by 9. B) 9 and its volume by 18. C) 9 and its volume by 27. D) 27 and its volume by 81. E) none of these.

) The effects of scaling are beneficial to swimmers who are relatively A)small. B) large. C) doesn't really benefit either. 4) A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density? A) 100 kg per cubic meter B) 200 kg per cubic meter C) 500 kg per cubic meter D) 1000 kg per cubic meter E) none of these

) If object A in your left hand and object B in your right hand both have the same weight density, then they A) have equal mass densities. B) may have quite unequal mass densities. 6) If the mass of an object were to double while its volume remains the same, its density would A)double. B)stay the same. C) halve.

) Doubling the thickness (diameter) of a rope will multiply its strength by A)1. B)4. C)3. D)2. E) 1/2. 8) Which has more skin compared to its body weight, an elephant or a mouse? A) typically, both the same B) elephant C) mouse

) Which will bounce higher off a hard surface? A)a steel ball B)a rubber ball C) Both bounce the same. 10) A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side by side are used to suspend the block, so each spring supports half the weight of the block, then each spring will stretch A)5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of these.

) A metal block has a density of 5000 kg per cubic meter and a volume of 2 cubic meters. What is the block's mass? A)1000 kg B) 2500 kg C) 5000 kg D) 10,000 kg E) none of these 12) A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume? A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of these

) When a chocolate bar is cut in half, its density is A)doubled. B)halved. C) unchanged. 14) A weightless spring is stretched 10 cm by a suspended 1-kg block. If two such springs are used to suspend the block, one spring above the other, to effectively provide one double-length spring, then the total stretch of the double-length spring will be A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of these.

) A candymaker is making taffy apples. If she buys 100 kg of small apples rather than 100 kg of large apples, she will need A) the same amount of taffy. B) more taffy. C) less taffy. 16) In cold weather, your hands will be warmer if you wear A)gloves. B)mittens. C) both will be the same.

Answers -- MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question.

12.22 Chapter 12 1) Answer: A 2) Answer: C 3) Answer: B 4) Answer: C 5) Answer: A 6) Answer: A 7) Answer: B 8) Answer: C 9) Answer: A 10) Answer: A 11) Answer: D 12) Answer: B 13) Answer: C 14) Answer: C 15) Answer: B 16) Answer: B