Explanation:
(D) i think there you go have a good day
Answer:
The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
Explanation:
Given that,
Diameter = 50 mm
Temperature = 15°C
Diameter = 10 mm
Stress = 12 MPa
We need to calculate the temperature of steel
Using formula of stress

Where, Y = young modulus
T = temperature
= coefficient of linear expansion of the material
Put the value into the formula




We need to calculate the temperature of magnesium
Using formula of stress

Put the value into the formula




Hence, The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
It represents the distance and time, x, Y show that