the length of a string is 16cm. Its length becomes 20cm when supporting a weight of 5N. Calculate the length of the string when supporting a weight of 6N. Comment on the answer

Explanation:

According to hooks law "provide the elastic limit of an elastic material is not exceeded the extension e is directly proportional to the applied force F"

where F= applied force

           k= spring constant

           e= extension

Given data

length of string l = 16cm

extension  e = 20-16= 4cm

applied force = 5N

we need t o first calculate the spring constant k

apply the formula

we can now calculate the extension of the string when supporting a 6N weight

The length of the string when supporting a 6N weight is

COMMENT :According to the analysis an extra  weight of 1N will cause add 0.8cm to the length of the string

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.