A wire is stretched between two posts. Another wire is stretched between two posts that are two times as far apart. The tension in the wires is the same, and they have the same mass. A transverse wave travels on the shorter wire with a speed of 300 m/s. What would be the speed of the wave on the longer wire? m/s

A wire is stretched between two posts. Another wire is stretched between two posts that are two times as far apart. The tension in the wires is the same, and they have the same mass. A transverse wave travels on the shorter wire with a speed of 300 m/s. What would be the speed of the wave on the longer wire? m/s
A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than to the other. He fires a gun and, after a while, hears three echoes. The second echo arrives 2.5 s after the first, and the third echo arrives 0.5 s after the second. Assuming that the speed of sound is 343 m/s and that there are no reflections of sound from the ground, find the distance between the cliffs. m
A refrigerator has a surface area of 4.9 m2. It is lined with 0.082 m thick insulation whose thermal conductivity is 0.030 J/(s·m·°C). The interior temperature is kept at 5°C, while the temperature at the outside surface is 25°C. How much heat per second is being removed from the unit? J/s