Ahorizontal string fixed at both ends is oscillating in a standing wave pattern. consider the vertical motion of a point on the string. which, if any, of these points are moving with simple harmonic motion? a) only the antinodes b) only the nodes c) all of the choices are correct except the nodes, which don't move at all. d) only the fixed ends e) none of the choices is correct

Which material produces static charge when rubbed?

Can someone explain to me how to do this problem ?

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?