There are a number of ways to get the angle of the resultant; I'll just use the law again. 400² = 1000² + 700² - 2(1000)(700)cosφ φ - 18.19º is the internal angle between R and the 700 lb force.
There are a number of ways to get the angle of the resultant; I'll just use the law again. 400² = 1000² + 700² - 2(1000)(700)cosφ φ - 18.19º is the internal angle between R and the 700 lb force.