Because the block is not moving, the sum of the y components of the forces acting on the block must be zero. Find an expression for the sum of the y components of the forces acting on the block, using coordinate system b. Express your answer in terms of some or all of the variables FnFnF_n, _f, FwFwF_w, and θθtheta.

Explanation:

The first expression ; five over six is subtracted from two whole number two over 5 and the results is multiplied by three quarter

From the diagram where Fw = the force of the gravity, Fn = the normal force, Ff = the force of friction.

since it is said that ; the block is not moving, the sum of the y components of the forces acting on the block must be zero. hence sum of y components ( summation Fy) = 0 ; Ffsinθ + Fncosθ - Fw = 0

The attached file shows the diagram

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

no. dot product   =0 when vecs at right angles