Find theta which gives minimum F for constant speed

[Anood]

i have a question in physics that's very related to math. Can you please help me with it?

c) From the general expression in part (a), calculate the value of theta for which the value of F, required to maintain constant speed, is a minimum.

(Hint: At a point where a function is minimum, what are the first and second derivatives of the function? Here F is a function of theta.)

For the special case of w = 400 N and µk = 0.25, evaluate this optimal theta and compare your result to the graph you constructed in part (b).

The expression I found in part (a) was:

. . .F = µk*w / (cos(theta) + µk*sin(theta))

 

[stapel]

Please reply with the rest of the information: Parts (a) and (b), any instructions, definitions of the various variables and functions, and all your work leading to the answers you got for (a) and (b).

Thank you.

Eliz.