Two 1kg masses are heated up on a hot plate for the same amount of time. One is made of copper, the other of iron. The copper one rises from 20° C to 30°C, but the iron one only goes from 20°C to 25°C. Explain why this happens.

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?