Question

hi, How you would answer this; "A syringe to be used for drawing a sample of blood has a diameter of 20mm and a length of 5cm. Calculate the volume of blood in the syringe in mm3 when the syringe is full."

I got 1.57*10^-5 mm but the options given are all In *10^3 mm. Help please

Answer 1

convert all measurement to read the same.. cm ->mm or the other way around;

then use the formula for the volume of a cylnder:

V = pi(r^2)h where r = half the diameter, and h= the length of the needle.

Answer 2

Yes, I did that and come to the answer 1.57*10^-5 mm3

However, the choices given are:

a 1.57 x 10^3 mm3
b 6.28 x 10^3 mm3
c 15.7 x 10^3 mm3
d 62.8 x 10^3 mm3

Answer 3

50mm = 5 cm? is that right?

pi(10^2)(50)?

Answer 4

15707 mm^3 is what I get, move the decimal "3" places to get the other jargon...

15.7 x10^3

Answer 5

Oh thanks. Cos I changed them into meters then converted them
Must have converted it wrong

Answer 6

always remember, the exponent of the "10" tells you how many decimal places to move.....

and meters? wow.... :)

Answer 7

XD .. I know lol.

I have a few other problems, do I make a new post or post it here?

Answer 8

new post seems better, more people can see it then..

Answer 9

ok thanks again