bai tap tuan 3 của trường đại học

BÀI TẬP TUẦN 03
3.1. Sinh viên làm các bài tập F5-1 đến F5-6 trong sách Engineering Mechanics-Statics. Thirteenth
Edition (đáp số ở phần cuối cùng của cuốn sách). (Những bài này sinh viên tự làm để hiểu bài và nâng
cao kỹ năng làm bài, không cần nộp).
Từ bài 3.2 trở đi sinh viên làm vào giấy để nộp
3.2. Determine the horizontal and vertical components of reaction at the pin A and the reaction of the
rocker B on the beam.

3.3. The overhanging beam is supported by a pin at A and the two-force strut BC . Determine the
horizontal and vertical components of reaction at A and the reaction at B on the beam.
3.4. Determine the components of the support reactions at the fixed support A on the cantilevered beam.

3.5. If the wheelbarrow and its contents have a mass of
60 kg and center of mass at G , determine the magnitude of
the resultant force which the man must exert on each of the
two handles in order to hold the wheelbarrow in
equilibrium.
3.6. The ramp of a ship has a weight of 90 kg and a
center of gravity at G . Determine the cable force in CD
needed to just start lifting the ramp. Also, determine the
horizontal and vertical components of force at the hinge
(pin) at A .


3.7. Calculate the magnitude of the force supported by the pin at A under the action of the 1.5-kN load
applied to the bracket. Neglect friction in the slot.

3.8. A 35-N axial force at B is required to open the spring-loaded plunger of the water nozzle.
Determine the required force F applied to the handle at A and the magnitude of the pin reaction at O. Note
that the plunger passes through a vertically-elongated hole in the handle at B, so that negligible vertical
force is transmitted there.

3.9. The tie rod is used to support this overhang at the entrance of a building. If it is pin connected to the
building wall at A and to the center of the overhang B , determine if the force in the rod will increase,
decrease, or remain the same if (a) the support at A is moved to a lower position D , and (b) the support at
B is moved to the outer position C . Explain your answer with an equilibrium analysis, using dimensions
and loads. Assume the overhang is pin supported from the building wall.