Answer:
170 ⁰C
Explanation:
α= ΔL/(LO×ΔT)
HERE α is coefficient of linear expansion which is constant for different materials , its value for copper is 17×10^-6( ⁰C)^-1
ΔL is change in length , Lo is original length , ΔT is change in temperature
re arranging the equation for ΔT we get
ΔT = ΔL/(LO×α)
= (0.00130)/(0.450× 17×10^-6)
= 169.9⁰C
= 170 ⁰C
Light slows down
Yes it does.
"The North Magnetic Pole moves over time due to magnetic changes in Earth's core. " - Wikipedia.
It does move around as the magnetic north does.
