- #1
surfinusa555
- 2
- 0
To move a large crate across a rough floor, you push on it with a force at an angle of 21 degrees below the horizontal, as shown in the figure:
http://img227.imageshack.us/img227/4950/walker67ac0.jpg
Find the force necessary to start the crate moving, given that the mass of the crate is 32kg and the coefficient of static friction between the crate and the floor is 0.50.
[tex]
F_x = \mu_s * F_N
[/tex]
Here is what I did, and got the wrong answer:
[tex]
M_c = 32kg \\*
[/tex]
[tex]
\mu_s = 0.50
[/tex]
[tex]
F_x = \mu_s * F_N
[/tex]
So...
[itex]
F_x = \mu_s * (M_c) * (a_g)
[/itex]
[tex]
F_x = 0.5*(32kg)*(9.8 m/s^2)
[/tex]
[tex]
F_x = 156.8N
[/tex]
So...
[tex]
Cos(21) = (156.8 N)/C
[/tex]
C = 167.96 N
That answer is wrong... so what am I doing wrong?
http://img227.imageshack.us/img227/4950/walker67ac0.jpg
Find the force necessary to start the crate moving, given that the mass of the crate is 32kg and the coefficient of static friction between the crate and the floor is 0.50.
[tex]
F_x = \mu_s * F_N
[/tex]
Here is what I did, and got the wrong answer:
[tex]
M_c = 32kg \\*
[/tex]
[tex]
\mu_s = 0.50
[/tex]
[tex]
F_x = \mu_s * F_N
[/tex]
So...
[itex]
F_x = \mu_s * (M_c) * (a_g)
[/itex]
[tex]
F_x = 0.5*(32kg)*(9.8 m/s^2)
[/tex]
[tex]
F_x = 156.8N
[/tex]
So...
[tex]
Cos(21) = (156.8 N)/C
[/tex]
C = 167.96 N
That answer is wrong... so what am I doing wrong?
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