2. Under the \'Resources\' tab on our class website, open the Active Figure titl

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: ·dg, ac, dD and ). 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)?

Explanation / Answer

Here, For alphaa

alphaa = 0.87 *10-3 /50

             = 1.74 * 10-6 /C

This metal is copper after looking at table .

Here, For alphab

alphab = 1.47 *10-3 /50

             = 29.4* 10-6 /C

This metal is lead after looking at table .

Here, For alphac

alphac = 1.3 *10-3 /50

             = 26 * 10-6 /C

This metal is aluminium after looking at table .

Here, For alphad

alphad = 0.60 *10-3 /50

             = 12 * 10-6 /C

This metal is steel after looking at table .

Here, For alphae

alphae = 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 .

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