2). If you record a wave going 4m/s and the Period of the wave was
60s, how long was the wave?

see earlier

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide