An aluminum beam 86 m long and with a cross-sectional area of 0.107 m2 is used as part of a bridge. The beam is clamped rigidly at both ends.
(a) If the temperature of the beam is increased by 31°C, what is magnitude of the extra force exerted by the beam on one of its supports?
in N
(b) What is the magnitude of the force if the temperature of the beam is decreased by 44°C?