The force analysis of the moving pulley and the whole A is shown in figure 1(a): 3F+FP=GA+G moving pulley;
FP = GA+G-3f = 1500n+ 100n-3×200n = 1000n。
Right bar PQ? The stress analysis is shown in figure1(b): FP× op = FQ× OQ;
FQ = FP×OPOQ = 1000n× 14 = 250n
The stress analysis of B is shown in figure 1(c), which is obtained from the equilibrium condition: GB = FQ = 250 N.
(2) when F 1=2F=400N, po ′: o ′ q =1:1.
The overall stress analysis of moving pulley and A is shown in Figure 2(a): 3F 1+FP 1=GA+G moving pulley;
FP 1 = GA+G-3f 1 = 1500n+ 100n-3×400n = 400n。
Right bar PQ? The stress analysis is shown in Figure 2(b): fp/kloc-0 /× o ′ p = FQ/kloc-0 /× o ′ q;
FQ 1 = FP 1×O′QO′P = 400n× 1 1 = 400n
The force analysis of b is shown in fig. 2 (c): N 1+GB = FQ 1 = FQ1-GB = 400 n-250 n =150n.
And: n1:N2 = 3:11; So: N2 = 550 Newton.
By v1= 3v = 0.6m/s; F 1？ Power of: P = F 1V 1 = 240 W?
The pulley block efficiency η 1=W 1, and the total with W2 =(GA? FP 1)h3F 1h？ ①
(3) when F2=3F=600N, po'': o'' q = 4: 1.
The stress analysis of B is shown in Figure 3 (c): N2+GB = fq2, FQ2=N2+GB=550N+250N=800N.
Right bar PQ? The stress analysis is shown in Figure 3(b), with fp2×o "p = fq2×o" q；;
FP2=FQ2×？ QO，P=800N× 14=200N
The overall stress analysis of the moving pulley A and the additional counterweight is shown in Figure 3(a): 3f2+fp2 = ga+g+ga';
Then the gravity on the additional counterweight a' is: ga' = 3f2+fp2-ga-gmotion = 3× 600n+200n-1500n-100n = 400n.
Excluding the friction between the rope and the pulley, the pulley block efficiency can be obtained: η2=W2, where the total of W2 =(GA+GA'? FP2)h3F2h ②
① ② Get: η 1η2= I praised stepping on it. What is your evaluation of this answer? Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail and provide free professional consultation through Baidu Law Professional Edition. Other similar questions 2016-01-30 (2014? Mentougou District 1 Model) A schematic device designed by a scientific and technological team for athletes to use equipment for training is shown in Figure 25. Crossbar BC122016-06-23 (2011? Shaanxi simulation) is shown as the structural schematic diagram of a fitness equipment, in which the mass of each small pulley is 1kg and the mass of the heavy object is 20kg. (excluding friction, 52014-12-20 (2011? In the circuit shown in the figure, the voltage across the power supply remains constant. Close the switches S and S 1, and when the slider P moves to the sliding rheostat R2016-07-15 (2011? As shown in the figure, container A and container B are placed on a horizontal table, with the same mass and the same height of the upper and lower parts. The wall thickness of the container is 42014-1-13 (2011? As shown in the figure, the gravity of the object A is GA, and when the horizontal tensile force F+02016-02-21(2011? A model in Dongcheng District is an image of the mass and volume of two substances, A and B. If the solid sphere is composed of two substances, then (22016-06-29 (2011? As shown in the figure, a cylindrical container with a bottom area of Sb contains a proper amount of water, and a part of another cylinder A with a bottom area of s a is 2014-11-07 (2011? In the circuit shown in the figure, the power supply voltage is constant, the fixed resistance R1= 25Ω, and the maximum resistance of the sliding rheostat R2 is15Ω. 2 recommended to you: F.context('cmsRight', [{'URL':'/d 01373f082025aaf51aa256e9edab64034f1a07? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId':'A24KA00562 '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； The price of electric cars has dropped many times. Is the quality guaranteed? What impact will the "network toilet" have? Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 17 198258 10；