A steel bridge is 5.5m long. If the linear expansivity of steel is 0.000011/℃, how much will it expand when temperature rise by 10 ℃? Give your answer in cm

The expansion of the steel bridge is 0.0605 cm

Explanation:

The given length of the steel bridge, L = 5.5 m

The linear expansivity of the steel bridge, = 0.000011/°C

The rise (change) in the temperature, ΔT = 10°C

Let, ΔL, represent the expansion of the steel bridge

Given that the linear expansivity, , of a material is the change in the length of a material per unit length of the material per unit change in the temperature, we have;

= ΔL/(L × ΔT)

∴ ΔL = × L × ΔT = 0.000011 /°C × 5.5 m × 10 °C = 0.000605 meters

ΔL = 0.000605 meters

The expansion of the steel bridge, ΔL = 0.000605 meters = 0.000605 m × 100 cm/m = 0.0605 cm

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.