Question 7 of 10 Why are railroad tracks built with a flexible expansion and contraction joint? A. The two have equal coefficients of linear expansion. O B. The tracks have a smaller coefficient of linear expansion than the ground beneath. O C. The ground beneath has a larger coefficient of linear expansion than the tracks. O D. The tracks have a larger coefficient of linear expansion than the ground beneath.​

Will give brainliest! which statement best describes the difference between strong nuclear forces and weak nuclear forces? weak nuclear forces are involved when certain types of atoms break down. strong nuclear forces are responsible for holding atoms' nucleus together. weak nuclear forces hold bonds between atoms together. strong nuclear forces hold together the nucleus of an atom. strong nuclear bonds prevent atoms from falling apart. weak nuclear bonds prevent compounds from falling apart. strong nuclear forces are involved in breaking electrons from their shells. weak nuclear forces hold protons in the nucleus.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic