the roof on a house rises 1 .00 m over a horizontal distance of 3.5 m. a 71 kg roofer stands on the roof. is the frictional force that keeps the roofer from slipping equal in magnitude to fparallel or fperpendicular? what is the magnitude of this force?

I'm pretty sure its fparallel, but how do you find fparallel when it gives you a distance? the formula i've been using is fparallel= mg sin(theta)

  1. 👍
  2. 👎
  3. 👁
  1. friction has to be parallel to the roof.


    where theta= arctan(1/3.5)
    solve for theta, then cos theta. If you wish to avoid trig, if tantheta=1/3.5, then cosine=3.5/sqrt(1+3.5^2) check my triangle on that.

    Dont forget about the portion of weight sliding down the plane... mgSinTheta

    1. 👍
    2. 👎
  2. pinecone

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    A playground is on the flat roof of a city school, 5.8 m above the street below (see figure). The vertical wall of the building is h = 7.30 m high, to form a 1.5-m-high railing around the playground. A ball has fallen to the

  2. Southern Union

    A large building has an inclined roof. The length of the roof is 64.0 m and the angle of the roof is 20.0° below horizontal. A worker on the roof lets go of a hammer from the peak of the roof. Starting from rest, it slides down

  3. Physics

    After delivering his toys in the usual manner, Santa decides to have some fun and slide down an icy roof. The roof is 7 m in length and makes an angle of 41° with the horizontal. He starts from rest at the top of the roof and

  4. math

    While working on the roof of his house, John leans a 15 foot ladder against a second story window. If the distance on the ground between the base of the ladder and the house is nine feet, at what height does the ladder reach the

  1. science

    Wind blows at the speed of 30m/s across a 175m^2 flat roof if a house. what is the pressure difference between inside the house and the outside of the house just above the roof? (assume the air pressure inside the house is

  2. Pre Algebra

    Which hill described in the table is the steepest and why? Street. Horizontal distance vertical (ft). Rise of Street (ft) Dixie hill. 100. 60 Bell hill. 100. 50 Liberty hill 100. 20 A. Dixie hill; it rises 5 feet for every 3 feet

  3. trig

    A roadway rises 55ft in horizontal distance of 1/2 mile (1mile=5280ft) Find the tangent of the angle that it makes with the horizontal.

  4. Physics

    "A workman sitting on top of a roof of a house drops his hammer. The roof is smooth and slopes at an angle of 30.0 degrees to the horizon. It is 32m long and its lowest point is 32m from the ground. How far from the house's wall

  1. Math help please

    Which hill described in the table is the steepest? Explain. Street|Horizontal distance|vertical rise Dixie |80 |40 hill | Bell |80 |20 hill | | Liberty|80 |60 hill | | A)Bell Hill;it rises 1 foot for every 4 feet of horizontal

  2. Advanced Physics

    If wind blows at a speed of 30 m/s over the roof of your house, what is the pressure diference on your roof between the air inside and the air outside? What net force does this produce on a roof having an area of 175 m^2? 1.3

  3. Math "Need Help Asap"!

    9.)Which hill described in the table is the steepest? Explain.' (Table) Street Horizontal Distance (ft) Vertical Rise Dixie Hill 80 40 Bell Hill 80 20 Liberty Hill 80 60 A.Bell Hill; it rises 1 foot for every 4 feet of horizontal

  4. math

    22. Bob and James are finishing the roof of a house. Working alone, Bob can shingle the roof in 10 hours. James can shingle the same roof in 16 hours. How long will it take them working together to shingle the roof? Round your

You can view more similar questions or ask a new question.