Question

A soap film of surface tension 3 × 10^-2 formed in a rectangular frame can support a straw as shown in Fig. If g = 10 ms^-12, the mass of the straw is ______.

Options

• 0.006 g

• 0.06 g

• 0.6 g

• 6 g

Answer 1

A soap film of surface tension 3 × 10^-2 formed in a rectangular frame can support a straw as shown in Fig. If g = 10 ms^-12, the mass of the straw is 0.6 g.

Explanation:

m × 10 = 2 × 3 × 10^-2 × `10/100`

or m = 6 × 10^-4 kg

= 6 × 10^-4 × 10³ g 

= 0.6 g