capillary

[logistic_guy]

here is the question

A \(\displaystyle 0.4\)-mm-diameter glass tube is inserted into water at \(\displaystyle 20°C\) in a cup. The surface tension of water at \(\displaystyle 20°C\) is \(\displaystyle \sigma_s = 0.073\) N/m. The contact angle can be taken as zero degrees. The capillary rise of water in the tube is

(a) \(\displaystyle 2.9\) cm
(b) \(\displaystyle 7.4\) cm
(c) \(\displaystyle 5.1\) cm
(d ) \(\displaystyle 9.3\) cm
(e) \(\displaystyle 14.0\) cm


my attemb
the notation of the question is a little ambiguous
do it mean \(\displaystyle \sigma_s = \Sigma_s\)
i don't know \(\displaystyle \sigma_s\)
i know \(\displaystyle \Sigma_s\)

 

[khansaheb]

here is the question

A \(\displaystyle 0.4\)-mm-diameter glass tube is inserted into water at \(\displaystyle 20°C\) in a cup. The surface tension of water at \(\displaystyle 20°C\) is \(\displaystyle \sigma_s = 0.073\) N/m. The contact angle can be taken as zero degrees. The capillary rise of water in the tube is

(a) \(\displaystyle 2.9\) cm
(b) \(\displaystyle 7.4\) cm
(c) \(\displaystyle 5.1\) cm
(d ) \(\displaystyle 9.3\) cm
(e) \(\displaystyle 14.0\) cm


my attemb
the notation of the question is a little ambiguous
do it mean \(\displaystyle \sigma_s = \Sigma_s\)
i don't know \(\displaystyle \sigma_s\)
i know \(\displaystyle \Sigma_s\)

Given:

The surface tension of water at \(\displaystyle 20°C\) is \(\displaystyle \sigma_s = 0.073\) N/m

Read textbook and consult Google - thou shall know,,,,,,,,