Question

2. Under the 'Resources' tab on our class website, open the Active Figure titled: 'Thermal Expansion of a Metal Washer'. Use the slider controls and values shown in the Active Figure to answer these questions. a) Calculate the coefficient of linear expansion for each of the 5 materials. (Find: α·dg, ac, dD and α). b) Compare each coefficient you found with the values in Table 19.1 in Serway (or Table 17-1 in Giancoli) and make your best guess as to what type of metal each of the 5 materials is. c Does the color shown for each metal in the Active Figure look right for the metal you identified in c) Does the color shown for each metal in the Active Figure look right for the metal you identified in part b)?

Answer 1

Here, For alpha_a

alpha_a = 0.87 *10^-3 /50

             = 1.74 * 10^-6 /C

This metal is copper after looking at table .

Here, For alpha_b

alpha_b = 1.47 *10^-3 /50

             = 29.4* 10^-6 /C

This metal is lead after looking at table .

Here, For alpha_c

alpha_c = 1.3 *10^-3 /50

             = 26 * 10^-6 /C

This metal is aluminium after looking at table .

Here, For alpha_d

alpha_d = 0.60 *10^-3 /50

             = 12 * 10^-6 /C

This metal is steel after looking at table .

Here, For alpha_e

alpha_e = 0.98 *10^-3 /50

             = 19.6 * 10^-6 /C

This metal is brass after looking at table .

c) Yes, the colour is right   for metal identified .