Two blocks a and b have a weight of 10 lb and 5 lb , respectively. they are resting on the incline for which the coefficients of static friction are μa = 0.16 and μb = 0.23. determine the angle θ which will cause motion of one of the blocks. what is the friction force under each of the blocks when this occurs? the spring has a stiffness of k =

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction