Question: A woman pulls a sled which, together with its load, has a mass of m kg. If her arm makes an angle of θ with her body (assumed vertical) and the coefficient of friction (a positive constant) is μ, the least force, F, she must exert to move the sled is given by
F = mgμ/(sin Θ + μ cos Θ)
If μ = 0.15, find the maximum and minimum values of F for 0 ≤ θ ≤ π/2. Give answers as multiples of mg.