1. A steel beam 2 cm x 2cm and 1.5 m long fits tightly between two pieces of concrete at 15 °C, what force is generated by the beam when it heats up to 35 °C in the hot sun? (Ysteel = 2.0 x 1011 N/m2, asteel = 12 x 10-6/°C)
(assume concrete does not expand)

2. If 25,000 J of heat energy is added to 0.5 kg of water at 10 °C what is the new temperature of the water?
(cwater = 4,186 J/kg°C)

thank you!!

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