Ametal wire 19 m long is cooled from 41 to -3°c. how much of a change in length will the wire experience if the coefficient of thermal expansion for this metal is 21 x 10-6 (°c)-1? if the change in length is negative (i. e., the wire shrinks), insert a minus sign before the numerical answer.

ΔL = - 0.017556 m

Explanation:

Given

L₀ = 19 m

T₀ = 41ºC

T₁ = -3ºC

α = 21*10⁻⁶ °C⁻¹

ΔL = ?

We can use the equation

ΔL = L₀*α*ΔT

where

ΔT = T₁ - T₀ = -3ºC - 41ºC

⇒  ΔT = -44ºC

then

ΔL = (19 m)*(21*10⁻⁶ °C⁻¹)*(-44ºC)

⇒  ΔL = - 0.017556 m

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s