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 ':' '，}])； Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? What impact will the "network toilet" have? The price of electric cars has dropped many times. Is the quality guaranteed? 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 196728 15；