Question

2 parts thx!

1. A flat aluminum plate has a circular hole of diameter 1.739 cm at 0.00 °C.What is the change in its diameter when the temperature of the plate is increased to 116 °C? For reference, the coefficient of thermal expansion for aluminum is 2.3 x 10^-5/C°. Give at least 2 significant figures in your answer, which should be in cm.

2. A flat plate made of an unknown metal has a circular hole of diameter 2.89 cm at 0.00 °C that increases in diameter by 0.004 when the temperature is raised from 0.00 °C to 113 °C. What is the coefficient of thermal expansion for this unknown metal.  Express your answer in parts per million per degree Celsius (for example, an expansion coefficient of 23 x 10^-6/°C would be 23 ppm/°C). However, enter only the numerical part of the answer.

Answer 1