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.​

Which object is most likely represented by a dot?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?