L2 slide 10: Surface-tension work (ENGR5003)

L2 slide 10: Surface-tension workFrom lectureCurrent specThird1 marks2 min

A liquid has a surface tension of 0.05 N/m. Its surface area is increased by $0.02\ \mathrm{m^2}$ . How much mechanical work is required?

Formulas you may need

Surface-tension work: $dW = \sigma_s\,dA$ (on the formula sheet, forms of mechanical work)

A0.0005 JB0.001 JC0.0025 JD0.025 J