How many calories are required to heat each of the following from 15 °C to 65 °C? 

(a) 3.0 g of aluminum, 

(b) 5.0 g of Pyrex glass, 

(c) 20 g of platinum. The specific heats, in cal/g·°C, for aluminum, Pyrex, and platinum are 0.21, 0.20, and 0.032, respectively.