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,,,,,,,,