Water flows at 10 m/s through a pipe with radius 0.025 m. The pipe goes up to the second floor of the building, 2.5 m higher, an
d the pressure remains unchanged. Which of the following statements is true concerning the velocity of water in the pipe and the radius of the pipe on the second floor?
O A. Since this is a closed system, the velocity of water and area of the pipe are the same on both floors.
OB. On the second floor, the velocity of the water increased and the area of the pipe is larger.
Oc. On the second floor, the velocity of the water increased and the area of the pipe smaller.
OD. On the second floor, the velocity of the water decreased and the area of the pipe is larger.
OE. On the second floor, the velocity of the water decreased and the area of the pipe is smaller.
OF. There is not enough information to determine what happens to the water and pipe size.
O A. Since this is a closed system, the velocity of water and area of the pipe are the same on both floors.
OB. On the second floor, the velocity of the water increased and the area of the pipe is larger.
Oc. On the second floor, the velocity of the water increased and the area of the pipe smaller.
OD. On the second floor, the velocity of the water decreased and the area of the pipe is larger.
OE. On the second floor, the velocity of the water decreased and the area of the pipe is smaller.
OF. There is not enough information to determine what happens to the water and pipe size.
1 answer:
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Answer:
2,38kg
Explanation:
Mass in function of time can be found by the formula: , where
is the initial mass, t is the time and k is a constant.
Given that a sample decay 1% per day, that means that after first day you have 99% of mass.
, but
, so we have
, then
Now using k found we must to find .