10. [1pt] A fisherman and his young daughter are in a boat on a small pond. Both

Question

10. [1pt]
A fisherman and his young daughter are in a boat on a small pond. Both are wearing life jackets. The daughter is holding a large floating helium filled balloon by a string. Consider each action below independently, and indicate whether the level of the water in the pond R-Rises, F-Falls, S-Stays the Same, C-Can't tell. (If in the first the level Rises, and in the second it Falls, and for the rest one Cannot tell, enter RFCCC)  

A) The daughter gets in the water, looses her grip on the string, letting the balloon escape upwards.
B) The fisherman lowers himself in the water and floats on his back
C) The fisherman fills a glass with water from the pond and drinks it.
D) The daughter pops the balloon.
E) The fisherman knocks the tackle box overboard and it sinks to the bottom.

Answer:  

11. [1pt]
Suppose that it takes takes 12.0 hr to drain a container of 5730 m3 of water. What is the "mass flow rate," in kilograms per second, of water from the container?

Explanation / Answer

A) The daughter gets in the water, looses her grip on the string, letting the balloon escape upwards.
Explanation:
After getting in the water to float, but before releasing the balloon, the daughter and the balloon displace just as much water as when she was in the boat holding the balloon. However, after releasing the balloon, she displaces more water. Therefore the pond rises. (Answer: R).

B) The fisherman lowers himself in the water and floats on his back

Explanation :
After getting in the water to float, the fisherman displaces just as much water as when he was in the boat. Therefore, the level of the pond remains unchanged. (Answer: S).

C) The fisherman fills a glass with water from the pond and drinks it.
Explanation:
After drinking the glass of water, the fisherman displaces more water by exactly the amount that he drank. But the pond does not rise, since its volume has decreased by exactly the amount by which the fisherman displaces more water. Therefore, the level of the pond remains unchanged. (Answer: S)

D) The daughter pops the balloon.
Explanation:After the daughter pops her balloon, she displaces more water, so the pond rises. (Answer: R).

E) The fisherman knocks the tackle box overboard and it sinks to the bottom.
Explanation:
A) The tackle box is denser than water. In the boat, it displaces its own weight in water. Resting on the bottom of the pond, it displaces only its own volume in water. The latter displacement is smaller than the former, so the pond falls. (Answer: F).

so fonally i got RSSRF

11) mass flow rate is dm/dt = density*volume/dt = (1000*5730)/(12*3600)

dm/dt = 132.63 kg/second

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