Una viga de acero tiene 5 m de largo a una temperatura de 20 c en un dia caluroso, la temperatura se eleva a 40 c ¿cual es el cambio en la longitud de la viga debido a la expansión térmica?

ΔL = 1.2 10⁻³ m

Explanation:

The expression for thermal expansion is

        ΔL = α L₀ ΔT

in this case it indicates that the length is L₀ = 5 m for T₀ = 20C the final temperature is T_f = 40 C

the table shows the value of thermal expansion for steel α = 12 10⁻⁶ C⁻¹

let's calculate

        ΔL = 12 10⁻⁶  5 (40 -20)

        ΔL = 1.2 10⁻³ m

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )