Two concrete spans of a 120 m long bridge are placed end to end so that no room is allowed for expansion. 120 m t t + 20◦c y if the temperature increases by 20◦c, what is the height to which the spans rise when they buckle? assume the thermal coefficient of expansion is 1.2 × 10−5 ( ◦c)−1 . answer in units of m.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?