The force of attraction exerted by non moving static charges in each other
A) electrostatic force
B) gravitational force
C) electromagnetic force
D) attractive force

uranium fissions/breaks up giving out energy and neutrons

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

prndulum needs thread, weight clock to time swings