3. A circular hole of diameter 1.8 cm is made in an aluminium plate at 0 °C. The linear thermal expansion coefficient for aluminium, αl = 1.9 ×10−3 per °C What will be the diameter at 120 °C?.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n