Vectors Homework Help: Find Degree

[lwin]

Homework Statement

Can’t seems to find the "°"

Relevant Equations

Fx=Fcos”°”
Fy=Fsin”°”
Resultant = Squareroot(Sum of Fx)^2+(Sum of Fy)^2

Can’t seems to find the degree

 

[lomidrevo]

According to the diagram, there are 3 forces acting. What should you to do with them to get the resultant force?
Hint: Try to setup a system of two equations with two unknowns.

 

[lwin]

According to the diagram, there are 3 forces acting. What should you to do with them to get the resultant force?
Hint: Try to setup a system of two equations with two unknowns.

Already did that

 

[EEristavi]

Hint: Try to setup a system of two equations with two unknowns.

These 2 equations are "written on" x & y axises

y axis:
750 cos(41) = 390 sin(35) + p cos(θ)

x axis:
>>you write this similarly<<P.S.
you may need to know that:
if,
cos(θ) = k
Then,
θ = arccos(k)

 

[lwin]

These 2 equations are "written on" x & y axises

y axis:
750 cos(41) = 390 sin(35) + p cos(θ)

x axis:
>>you write this similarly<<P.S.
you may need to know that:
if,
cos(θ) = k
Then,
θ = arccos(k)

I will try it later, thanks :’)

 

[gneill]

Problem Statement: Can’t seems to find the "°"
Relevant Equations: Fx=Fcos”°”
Fy=Fsin”°”
Resultant = Squareroot(Sum of Fx)^2+(Sum of Fy)^2

Can’t seems to find the degree

Hi @lwin,

Welcome to Physics Forums.

In future, please make sure that the full problem is described in the Problem Statement section rather than the Attempt at Solution section.

Photos of a computer screen are not the best way include images. A better method would be to use a snipping tool to capture the relevant portion of the screen and then pasting the result into the post. Windows has a snipping tool odly enough called "Snipping Tool"

 

[lwin]

Hi @lwin,

Welcome to Physics Forums.

In future, please make sure that the full problem is described in the Problem Statement section rather than the Attempt at Solution section.

Photos of a computer screen are not the best way include images. A better method would be to use a snipping tool to capture the relevant portion of the screen and then pasting the result into the post. Windows has a snipping tool odly enough called "Snipping Tool"

Alright I will take note. It is my first time posting so do forgive me.

 

[gneill]

Alright I will take note. It is my first time posting so do forgive me.

No worries. Again, welcome!

 

[lomidrevo]

@lwin, only now I noticed that it was your first post - welcome to PF!

One more hint for you: when solving the two equations for $P$ and $\theta$, this equation might come handy:
$$\cos^2 \theta + \sin^2 \theta = 1$$