Two metallic rod of the same material but of different lengths are heated. smaller rod has circular area of cross section but larger rod has rectangular cross section. will their linear expansivity be the same or different? give justification

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

Why is metal often used for cooking pan?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.