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cdn.fbsbx.com Done 3.A pendulum is made of a rod of length L and negligible mass, but capable of thermal expansion, and a weight of negligible size. (a) Show that when the temperature increases by all", the period of the pendulum increases by a fraction (\"1792- (b) A clock controlled by a brass pendulum keeps time correctly at 10 \"C . If the room temperature is 30 C , does the clock run faster or slower? What is its error in seconds per day? 4. At temperatures of a few hundred kelvins the specic heat capacity of copper approximately follows the empirical formula [-=(1+|')T+ "'7 Where \":3 49 Jihkg [i :0 .107 12153 and 5 =4 - 5'8 1i 0 J k 5 How much heat is needed to raise the temperature of a 2.00kg piece of copper from 30 'C to 250 \"C