Current location - Health Road Network - Medical equipment enterprise - (2012? Shijingshan District, second model) construction site is often used as shown in the figure of the device to carry building materials, the use of the pulley block by a, b, c, d, e five pulleys

(2012? Shijingshan District, second model) construction site is often used as shown in the figure of the device to carry building materials, the use of the pulley block by a, b, c, d, e five pulleys

as shown, n = 4,

∵ not counting the rope weight and friction,

∴F=

1
4
(G+G motion)=
1
4
(1500N+50N×2)=400N,

The speed of movement of the tension end:

v=4×0.5m/s=2m/ s,

Power of work done by the pulling force:

P=Fv=400N×2m/s=800W.

So the answer is: 800.

Related articles