Finding angle with just static friction coefficient

[phee]

Homework Statement

m = 10kg
static friction coefficient (Us) = 0.4
angle = ?

Homework Equations

If the coefficient of static friction is 0.4, calculate the angle at which the box begins to slide down the plank as it tilts.

The Attempt at a Solution

m = 10kg
Us = 0.4
angle = ?

Attempt:

Us = tanΘ

0.4 = tanΘ

Θ= tan-1 0.4
Θ= 21.8

Is what I did correct? Thank you for feedback

 

[PeterO]

Homework Statement

m = 10kg
static friction coefficient (Us) = 0.4
angle = ?

Homework Equations

If the coefficient of static friction is 0.4, calculate the angle at which the box begins to slide down the plank as it tilts.

The Attempt at a Solution

m = 10kg
Us = 0.4
angle = ?

Attempt:

Us = tanΘ

0.4 = tanΘ

Θ= tan-1 0.4
Θ= 21.8

Is what I did correct? Thank you for feedback

That is correct