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• 3. In the decomposition of a force, the condition for a unique solution is In the decomposition of force, the condition of unique solution is as follows \X05a. The direction of the two components is known; x05b. The magnitude of the two components is known; \X05c. Know the magnitude and direction of one component; x05d. Know the magnitude of one component and the direction of the other There's a reward. Hurry up,
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• 8. Practical problems of physical lever Xiaoming and Xiaohua play on the seesaw. Xiaoming sits two meters away from the fulcrum and can just move Xiaohua. At this time, the seesaw is in the horizontal position. If Xiaoming X. Xiaohua y. (weight) is set, Xiaohua is () meters away. If you take the same weight iron ball () (write the name of the person), you will drop
• 9. A heat calculation problem about middle school physics, quick Thank you so much! Every day, the most suitable temperature for grandma who is not able to move is 40 degrees centigrade. He first takes about 3kg of 10 degrees centigrade cold water in a basin, and then pours some boiling water into the kettle. Regardless of the heat loss in the process, he calculates the quality of boiling water? (under standard air pressure) Thank you, thank you
• 10. 1. Regardless of self weight, the distance between the lifting button and the hook is 4cm, and the weight of the scale is 250g. It is used to weigh an object with a mass of 2kg. How far should the scale be away from the lifting button before the scale can be balanced? If the length of the scale is 60cm, how many kg can the scale weigh? 2. Put the 10kg iron ball on the board ob without gravity at a. the left end o of the board can rotate freely. At B, force F to lift the board vertically to keep it horizontal. Given that the board is 1m long and ab is 20cm long, calculate the size of F 3. The fulcrum of the light lever is O, the arm OA = 0.2m, OB = 0.4m, hang an object at the a end, and apply a vertical downward tension of 10N at the B end. The lever can be balanced in the horizontal position ——Best regards!
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• 17. Soil mechanics, the definition of average degree of consolidation 1. Why does it have nothing to do with the consolidation stress? (the greater the applied stress, the better the consolidation?) 2. Why does it have something to do with the stress distribution? Let's look at the following question again. The answer is a, which proves once again that it has nothing to do with the consolidation stress. Why? Since the pressure has nothing to do with consolidation, it is only related to time, then why are there building sinking accidents?
• 18. What is the effective stress principle in soil mechanics?
• 19. Stress calculation of H-beam under self weight Ha ha, in fact, I'm rather confused now. I want to pursue the correct answer. Let me give you an example to see if it's correct? A 21 meter long H-beam with two ends simply supported, size 600 (H) * 200 (W) * 11 (web thickness) * 17 (flange thickness) In order to calculate the maximum normal stress under self weight, the self weight is simplified as uniform load q = 0.998n/mm, moment of inertia: 7.76 + E008 mm ^ 4, then the maximum bending moment M = QL ^ 2 / 8 = 55014750n * mm The maximum stress of the beam is σ = mi / y = 50014750 * 7.76e8/600 (beam height) = 35MPa Excuse me, is my calculation correct? Please have a look,
• 20. 1. Why do we say that under normal circumstances, the self weight stress of soil will not cause the compression deformation (or settlement) of soil, and when the groundwater level drops, it will make the soil yield increase