We refer to astronauts in space as weightless, but not without mass. why?

Idon’t know how to solve this question

How does a hydroelectric power plant converts energy into energy.

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘