(a) a spring exerts a force of 13.0n when stretched 1.3m beyond its natural length. assuming that hooke's law applies, how much work was performed in stretching the spring to this length?
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(b) a spring exerts a force of 4.4n when stretched 1.1m beyond its natural length. how far beyond its natural length the spring can be stretched with 5.12j of work?
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Aballet student who learns with the of his instructor is demonstrating learning.

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.