Saved Bookmarks
| 1. |
A bar of iron is 10cm at 20celsius .at 19 Celsius it will be if alpha of iron is 0.000011 |
|
Answer» gth of the bar at 19 °C will be 9.99989 cmExplanation : From the law of thermal expansion of solid, we know that,L = L₀(1 + αΔt)where L₀ = ACTUAL length = 10 cmα = coefficient of thermal expansion = 0.000011Δt = temp. difference = 19 - 20 = -1 °Cputting these VALUES in the above equation we get,L = 10( 1 - 0.000011 x 1)=> L = 10(0.999989)=> L = 9.99989 cmHence the length of the bar at 19 °C will be 9.99989 cm |
|