Which two statements are true about a system? A system is a group of objects analyzed as one unit. 0 Energy that moves across system boundaries is conserved. There's only one way to define the boundaries of a system, IT All systems are made by humans,

When an object is heated it contracts. a. true b. false

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

Ain is , is 's of ? 0.62 0.79 1.27 1.50