Q7) A bucket left out overnight holds a volume of water, part of which freezes d

Question

Q7) A bucket left out overnight holds a volume of water, part of which

freezes during the night. In the morning the level of the ice plus water in

the bucket is

a) at the same level as it was when left out with liquid water

b) higher because ice is denser than water

c) higher because ice is less dense than water

d) lower because ice is denser than water

e) lower because ice is less dense than water

Q8) A stone weighing ten pounds in air is completely immersed in water

in a half-filled bucket. Its weight is also measured when it is within the

water after immersion.

The total weight in the bucket is

a) the original weight of the stone in air plus the weight of the water

b) the weight of the water plus the weight of the stone in air minus the

weight of the water it displaces

c) the weight of the water minus the weight of the stone

d) the weight of the stone in the water plus the weight of the water

originally in the bucket

e) none of the above

Q9) A box-shaped piece of concrete measures 3 ft by 1 foot by 1 foot. The

density of concrete is 156 pounds per cubic foot (Table 4.4 Ostdiek & Bord

p. 145 7th edition). In air the mass of the piece of concrete is

a) 52 pounds

b) 104 pounds

c) 156 pounds

d) 468 pounds

c) none of these

Q10) This same 3 ft x 1 ft x 1 ft piece of concrete is immersed in water

(density 62.4 lbs/cubic ft). In water it weighs

a) 26 pounds

b) 52 pounds

c) 141 pounds

d) 282 pounds

e) none of these

Q11) Juniper wood has a density of 35 pounds/cubic foot. Water has a

density of 62.4 pounds/cubic foot.

You have a board of juniper whose dimensions are 2 inches x 4 inches x 12 feet.

How much downward force must you put on it for it to stay submerged

in water?

a) 9 pounds

b) 18 pounds

c) 24 pounds

d) 35 pounds

e) none of these

Q12) A 100-pound ballet dancer stands on one toe in shoes with a

toe tip area of 2/3 of a square inch. What is the approximate pressure

of her toe on the floor in psi (pounds per square inch)?

a) 50 psi

b) 100 psi

c) 150 psi

d) 200 psi

e) none of these

Explanation / Answer

7. C

8. B

9. A

10. A

11. C

12. C

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