1.(a)A book is placed on a desk lid
1.(a)A book is placed on a desk lid which is slowly titled. Given that the book begins to slide when the inclination of the lid to the horizontal is 30°, find the coefficient of friction between the book and the desk lid. (b)State an assumption you have made about the book when forming the mathmatical model you used to solve part (a).
2.A particles is placed on a smooth plane inclined at 35°to the horizontal. The particle is kept in equilibrium by a horizontal force, of magnitude 8 N, acting in the vertical plane containing the line of greatest slope of the inclined plane though the particle. Calculate, in N to one decimal place,
(a)the weight of the particle, (b)the magnitude of the force exerted by the plane on the particle.
3.A particle of mass 0.3kg lies on a smooth plane inclined at an angle a(alpha）to the horizontal, where tan a = 3/4. The particle is held in equilibrium by a horizontal force of magnitude Q newtons. The line of action of this force is in the same vertical plane as a line of greatest slope of the inclined plane. Calculate the value of Q to one decimal place.
Ansewers 1,(a) 0.577 (b)The book was modelled as a particle. 2,(a) W = 11.4 (b)R = 13.9
3, 2.2
どなたか計算できる方、やり方を教えて下さい! よろしくお願いします。
Does anyone can do these questions?? if you know please tell me!!
お礼
ありがとうございました。 bearよくみかけるのですがなかなか理解するのが難しいです。