PLEASE HELP NO LINKS An object's center of mass is .

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An object's center of mass is .

Select all that apply.
the point about which the net torque is zero
the point about which an unconstrained rotation occurs
the geometric center of the object
the mass-weighted center of the object
the point about which the angular momentum is zero

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?