Question

(a) Convert 15C to Fahrenheit.
(b) The lineal coefficient of thermal expansion for aluminium is αAl = 2.3 × 10−5 C−1. A sample of aluminium is measured to be 4.00000m long at 20C. What is its length at 15C?
(c) The volume coefficient of thermal expansion for aluminium is βAl = 6.9 × 10−5 C−1. An aluminium vessel is shaped to accomodate 6000 microlitres of fluid at 20C. What is the capacity of the vessel at 15C?
(d) The specific heat capacity of aluminium is CAl = 900 J/(kg·C). Ten kilograms of aluminium are originally at 15C. Determine the amount of heat needed to change its temperature to 40C.
(e) The melting point of aluminium is 660C, and its latent heat of fusion is LF,Al = 400kJ/kg. (i) Compute the amount of heat needed to bring ten kilograms of aluminium from 15C to its melting point.
(ii) Compute the amount of heat needed to melt ten kilograms of aluminium.
(iii) Determine the minimum total amount of heat needed to melt 10kg of aluminium, originally at 15C.

Answer 1