Amerry-go-round with a a radius of r = 1.99 m and moment of inertia i = 194 kg-m2 is spinning with an initial angular speed of ω = 1.47 rad/s in the counter clockwise direection when viewed from above. a person with mass m = 68 kg and velocity v = 4.9 m/s runs on a path tangent to the merry-go-round. once at the merry-go-round the person jumps on and holds on to the rim of the merry-go-round.

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?