A concrete highway is built of slabs 11 m long (20 ∘C). Part A How wide should the expansion cracks between the slabs be (at 15 ∘C) to prevent buckling if the range of temperature is - 30 ∘C to 50 ∘C? Express your answer using two significant figures.

Apackage of supplies is dropped from a plane, and one second later a second package is dropped. neglecting air resistance, the relative velocity of the 1st package viewed from the second will 56) a) increase. b) be constant. c) be zero. d) depend upon their weight. e) decrease

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k