A cylindrical tube 7.8 cm high and 0.85 cm in diameter is used to collect blood samples. How many cubic decimeters (dm3) of blood can it hold?
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a. 1.8 x 10–2 dm3
b. None of these is within 5% of the correct answer
c. 4.4 x 10–3 dm3
d. 1.0 x 10–2 dm3
e. 4.4 x 10–4 dm3
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I got 4.426 units. HELP
2007-01-17 12:45:47 · 8 answers · asked by saira n 1 in Science & Mathematics ➔ Mathematics
find the area: which is pi*r^2*h
h = 7.8
r = 0.85
pi is about 3.14
3.14*0.85*0.85*7.8 = 17.7 cm^3.
divide by 10 to made it dm
so it's 1.8 dm^3
2007-01-17 12:50:03 · answer #1 · answered by car of boat 4 · 2⤊ 0⤋
Close but no cigar! The eqn h*r^2 8pi =V is okay, the radius is 1/2 the diameter, which you got correct, but you should divide by 1000 since it is dm cubed, so the correct answer is ~ 4.426 x 10^-3 dm^3, rounded to 2 sig figs is: 4.4 x 10^-3 dm^3
2007-01-17 13:00:32 · answer #2 · answered by lynn y 3 · 0⤊ 0⤋
No he said .85 is diameters, so Radius is .425
does the 10-3 and stuff mean 10 to the third power or sumting?
2007-01-17 12:52:51 · answer #3 · answered by Chestudent 2 · 0⤊ 0⤋
C is the obvious answer.
dm3= .001m3
So if you multiplied everything in meters then divide your answer by 0.001.
Try using meters for everthing. 1 dm3 equals one liter.
2007-01-17 12:56:44 · answer #4 · answered by Anonymous · 0⤊ 0⤋
you didn't convert the units.
1 dm = 10 cm
so (.085/2)^2*pie*0.78 gives you C, 4.4E-3 dm
2007-01-17 12:53:06 · answer #5 · answered by Taras 2 · 0⤊ 0⤋
the answer is either B or E...leaning more towards E
2007-01-17 13:00:58 · answer #6 · answered by Anonymous · 0⤊ 1⤋
wow u must be in mega college or somethin!!
2007-01-17 12:48:31 · answer #7 · answered by chicantabonita94 2 · 0⤊ 0⤋
i dont know use a calculater
2007-01-17 12:48:31 · answer #8 · answered by niki 2 · 1⤊ 1⤋