An iorn rod (a=11.8 x 10^-6 C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
ΔL= αLΔtº
Δtº = ΔL/αL=
=0.1/11.8•10⁻⁶•1000=8.43º
tº=0+8 =8℃
Δtº = ΔL/αL=
=0.1/11.8•10⁻⁶•1000=8.43º
tº=0+8 =8℃