raedusty3200
09.12.2020 •
Mathematics
A ruler is used to measure the width of the spine of a book.
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СМ
Using this ruler, what is the greatest level of precision possible for the measurement of the width of the
spine of the book?
1.00 cm
0 0.10 cm
0.02 cm
0.01 cm
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Ответ:
1.00 cm Is the greatest level of precision possible for the measurement of the width of the spin of the book
Ответ:
9514 1404 393
12 minutes
Step-by-step explanation:
Let c and h represent the filling times for the cold and hot taps, respectively. When the cold tap is 1/2 open, we presume that means the filling time becomes 2c.
In terms of baths per minute, the relationships are ...
1/c + 1/h = 1/3
1/(2c) +1/h = 1/(3 +1.8) . . . . . 1:48 min:sec is 1.8 minutes
Subtracting the first equation from twice the second, we get ...
2(1/(2c) +1/h) -(1/c +1/h) = 2(1/4.8) -(1/3)
1/h = 2/4.8 -1/3 = 1/12
h = 12
It takes the hot tap 12 minutes to fill the tub alone.