Question

A steel tape gives correct measurement at 20c piece of wood is being measured with the steel tape at 0c the reading is 25cm on the tape

Answer 1

from data, coefficient of linear expansion of steel , $\alpha$ = 1.2 × 10^-5 /°C

a/c to question, steel tape gives correct measurement at 20°C .

reading of tap is 25cm at 0°C
so, $L_0=25cm$
$T_i=0^{\circ}$

now use formula, $L=L_0(1+\alpha\Delta T)$

so, L = 25[1 + 1.2 × 10^-5 (20°C - 0°C)]

or, L = 25[1 + 1.2 × 10^-5 × 20]

or, L = 25[ 1 + 2.4 × 10^-4 ]

or, L = 25[ 1 + 0.00024]

hence, L = 25 × 1.00024 = 25.006 cm

hence, length of steel tape is 25.006 cm

Answer 2

Answer:

25.006m

Explanation: