A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk... A) also gains a positive charge.
B) acquires a negative charge.
C) remains neutral.
D) could either be positively or negatively charged. It depends on how hard the rod was rubbed.

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

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.