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?

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Plz me ! 1 which of earths spheres contains most of its mass? a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces? a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true? a earths atmosphere contains 78% water vapor which is essentail to life b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require d earths atmosphere allows radiation from the sun to pass through it and warm earths surface* 4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of a inertia b gravity c gravity and inertia* d neither gravity or inertia if you answer all questions right i will give