An object is moving to the west at a constant speed. Three forces are exerted on the object. One force is 10 N directed due North, and another is 10N directed due West. What is the magnitude and direction of the third force if the object is to continue moving West at a constant speed?

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?