huh? 115° ?
So, it was tilted up past the vertical, and then over onto its back?
When you get an answer, check to see whether it makes sense.
Determine the angle to the nearest degree at which a desk can be tilted before a paperback book on the desk begins to slide. Use the equation mg sin A = umg cos A and assume u = 1.11. (Enter only the number.)
I got 115 degrees.
5 answers
I still don't understand the lesson, but 48 degrees?
It was 48
yep. tan A = 1.1
Mg*sinA = Force parallel with plane.
Mg*CosA = Normal force or Force perpendicular to plane.
u*Mg*CosA = Force of static friction.
Mg*sinA - u*Mg*CosA = M*a. a = 0.
Divide both sides by Mg:
sinA - u*CosA = 0,
u*CosA = sinA,
sinA/CosA = u,
TanA = u = 1.11,
A = 48o.
Mg*CosA = Normal force or Force perpendicular to plane.
u*Mg*CosA = Force of static friction.
Mg*sinA - u*Mg*CosA = M*a. a = 0.
Divide both sides by Mg:
sinA - u*CosA = 0,
u*CosA = sinA,
sinA/CosA = u,
TanA = u = 1.11,
A = 48o.
1 answer