#8 A uniform block of weight 10 N, height 20 cm, and base 10 cm is placed base d
ID: 1999207 • Letter: #
Question
#8
A uniform block of weight 10 N, height 20 cm, and base 10 cm is placed base down horizontal plane 1 m long resting on a table. The coefficient of static friction is 0.3 and that of kinetic friction is 0.2. One end of the plane is slowly raised until the block either tips over or begins sliding. Which of the two possibilities happens first? What is the angle between the plane and the table when this happens? A wheel of diameter 0.6 m and weight 100 N is pushed over a curb of height 10 cm by a horizontal force F. What is the magnitude of this force if it is applied at the top of the wheel as shown in Fig. A, at the axle as shown in Fig. B?Explanation / Answer
a] We have to overcome the torque due to weight about axis passing through the corner of the curb.
F*[0.6-0.1] = 100*sqrt[0.3^2-0.2^2]
F = 22.36/0.5
= 44.7 N
b] F*[0.3-0.1] = 100*sqrt[0.3^2-0.2^2]
F = 22.36/0.2
= 111.8 N
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