Consider the following figure: an illustration of a circular steel casting with a gap. (a) If the casting is heated, does the width of the gap increase or decrease? increase decrease (b) The gap width is 1.840 cm when the temperature is 30.0°C. Determine the gap width when the temperature is 160°C. (Use 11 × 10^(-6) (°C)^(-1) for the average coefficient of linear expansion for steel. Give your answer to at least three decimal places.) cm