Physics

A force F = 119 N acts at an angle α = 31◦
with respect to the horizontal on a block of
mass m = 22.5 kg, which is at rest on a
horizontal plane.
The acceleration of gravity is 9.81 m/s
2
.
If the static frictional coefficient is µs =
0.72, what is the force of static friction?

i tried everything but i cant find the answer

1. 0
2. 0
3. 19
asked by andrew
1. F up = 119 sin 31 = 61.3 N
F x = 119 cos 31 = 102 N

normal force = m g - 61.3
= 22.5*9.81 - 61.3
= 159 N
friction force = .72*159 = 115 N

They did not ask for the horizontal acceleration?

1. 0
2. 0
posted by Damon

Similar Questions

1. Physics

The knot at the junction is in equilibrium under the influence of four forces acting on it. The F force acts from above on the left at an angle of with the horizontal. The 6 N force acts from above on the right at an angle of

asked by Kaitlyn on October 24, 2010
2. physics

A 51.4 N force is applied to the outer edge of a door of width d = 2.72 m a) Find the torque when the force acts perpendicular to the door. N · m (b) Find the torque when the force acts at an angle of è = 11.5° with respect to

asked by cobra on March 5, 2013
3. math

An airport runway intersections shows 2 parallel runways. A taxiway crosses both runways. If angle 8 measures 119, what is the sum of the measures of angle 1 and 4? a 122 b 238 c 119 d 299 I think the answer is b. Angles 1, 4, 5,

asked by keisha on November 24, 2007
4. math

The diagram of airport runway intersections shows 2 parallel runways. A taxiway crosses both runways. If angle 8 measures 119, what is the sum of the measures of angle 1 and 4? a 122 b 238 c 119 d 299 I think the answer is b.

asked by keisha on November 24, 2007
5. physics

One component of a magnetic field has a magnitude of 0.046 T and points along the +x axis, while the other component has a magnitude of 0.066 T and points along the -y axis. A particle carrying a charge of +7.50*10^-5 C is moving

asked by Anna on February 26, 2007
6. Physics

A 46.4-N force is applied to the outer edge of a door of width 1.26 m in such a way that it acts (a) perpendicular to the door (b) at an angle of 43.0 degrees with respect to the door surface, (c) so that the line of action of the

asked by Anonymous on October 31, 2012
7. Calculus

A force of 70 N acts at an angle of 40 degrees to the horizontal and a force of 125 N acts at an angle of 65 degrees to the horizontal. Calculate the magnitude and direction of the resultant and the equilibrant.

asked by Anonymous on May 25, 2010
8. trig

A force of 50 pounds acts on an object at an angle of 45°. A second force of 75 pounds acts on the object at an angle of -30°. Find the direction and magnitude of the resultant force.

asked by Cam on December 15, 2011
9. Physics continued

Sorry, I didn't see that there was a second part to the question. What is the difference between this one and the previous question I posted? The x and y components of a certain force are measured and found to be Fx = 68 ± 3N and

asked by Timothy on September 26, 2016
10. physics

One end of a meter stick is pinned to a table, so the stick can rotate freely in a plane parallel to the tabletop. Two forces, both parallel to the tabletop, are applied to the stick in such a way that the net torque is zero. The

asked by cj on July 16, 2013

More Similar Questions