Asection of railroad tracks through southern arizona are laid during the winter when the average temperature is 10 celsius(50fahrenheit). these tracks are made of 1025 steel and make use of expansion joints with gaps that are 4.6 mm (0.18in) wide. there are 16 km (9.9 miles) of track and each rail has a standard length of 11.9 m (39 ft). what is the hottest temperature than can be tolerated on this stretch of railroad without introducing thermal stresses?

Answercanyon;

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f. 

They both go downwards and the can break apart rocks 

Abnormal cell division causes cancer.hope that !