At 17°c, a rod is exactly 20.09 cm long on a steel ruler. both the rod and the ruler are placed in an oven at 306°c, where the rod now measures 20.18 cm on the same ruler. what is the coefficient of linear expansion for the material of which the rod is made? (in degrees c^-1)

Explanation:

Given that

At 17°C  ,Lo= 20.09 cm

At 306°C ,L= 20.18 cm

ΔL= 200.18 - 20.09 = 0.09 cm

ΔT = 306 - 17 = 289°C

We know that

ΔL = L α ΔT

α =coefficient of linear expansion

ΔL = Lo x α x  ΔT

0.09 = 20.09 x α x 289

Coefficient of linear expansion,

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j