A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg·°C and αcopper = 17 * 10-6/°C.

a. 0.022 cm

b. 0.044 cm

c. 0.059 cm

d. More information is needed

Question

Physics

Dylan Williams

6 December, 22:11

A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg·°C and αcopper = 17 * 10-6/°C.

a. 0.022 cm

b. 0.044 cm

c. 0.059 cm

d. More information is needed

+5

Answers (1)

Know the Answer?

Brody Pham · Answer 1

0.044 cm

Explanation:

mass of copper, m = 2 kg

length of rod, l = 50 cm

T1 = 23°C

Heat, Q = 40000 J

specific heat of copper, c = 387 J/kg°C

α = 17 x 10^-6 / °C

Let the change in the length of copper is Δl.

heat = mass x specific heat x ΔT

40000 = 2 x 387 x ΔT

ΔT = 51.68

Now use the formula for the linear expansion

Δl = l x α x ΔT

Δl = 50 x 17 x 10^-6 x 51.68

Δl = 0.044 cm

Thus the increase in length of rod is 0.044 cm.

A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg·°C and αcopper = 17 * 10-6/°C.a. 0.022 cmb. 0.044 cmc. 0.059 cmd. More information is needed

A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg·°C and αcopper = 17 * 10-6/°C.

a. 0.022 cm

b. 0.044 cm

c. 0.059 cm

d. More information is needed