A moving tennis ball would continue at the same speed and direction if A) it’s acceleration force is Greater than the frictional force force
B) the force of gravity is less than the force of downward acceleration
C) it’s frictional force is greater than its acceleration force
D) it is acted on by balanced forces

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?