If two dogs are pulling a bone with force-20Newtons in opposite direction, then the resultant force is​

Which model displays the change in a gas when the temperature of the gaseous system decreases?

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?

If frequency goes down, what happens to wavelength? does it get shorter or longer?