Scrub Brush
Scrub Brush
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 Korean Massage Bath Body Brush Sponge Scrub Loofah 5pcs  US $9.99
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 Black Bristle 10" Swivel Head Tile & Grout Scrub Brush US $14.95
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 NEW JAPANESE TAWASHI SCRUB BRUSH-ship free US $11.99
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 Full Circle Grunge Buster Tile Grout Scrub Brush Corner Cleaning Bathtub Shower US $8.99
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 Scrub Brush US $2.66
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 All Natural Tampico Household Scrub Brush Set US $23.95
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 Norpro 1075B Potato / Vegetable Scrub Brush US $4.95
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A window washer pushes his scrub brush up a vertical window at constant speed by physics physics physics?
A window washer pushes his scrub brush up a vertical window at constant speed by applying a force as shown in the figure below. The brush weighs 12.3 N, θ = 55.2° and the coefficient of kinetic friction is μk = 0.143.
magnatude of force??
normal force by window to brush.
If 55.2 degrees is the angle between horizontal and the handle, then resolve the force applied to the handle into horizontal and vertical components:
Fx=Fcos55.2
Fy=Fsin55.2
Fnormal = Fcos55.2 (since it is not accelerating in the x direction)
Fup - Ffric - wt = (mass)*(acceleration in the y direction)
Fsin55.2 - 0.143(Fcos55.2) - 12.3N = 0
Solve this equation for F. Then you can plug into Fcos55.2 to get the magnitude of the normal force.
December 18th, 2006 in
kitchen tools and gadgets | tags: brush, groutrageous, home, kitchen, scrub, scrub brush, scrub brush drill attachment, scrub brush for drill, scrub brush mop, scrub brushes