Help A. 12,240 B. 6,120
1 answer:
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Answer:
m = 3.57
Explanation:
Given that,
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock.
We need to find the ideal mechanical advantage of Sergei's lever.
It is equal to the ratio of resistance arm to the effort arm. In terms of length it is given by :
So, the ideal mechanical advantage of the lever is 3.57.
Answer:
709.06 N
Explanation:
To do this, you need to do the drawing of this exercise. In the picture below, you have the draw, and the procedure to do this exercise. You need to apply 2nd Newton's law which is:
F = m*a
However, in this case, we only have tension and the weight of the object (As you can see in the picture), and we have no movement, the object it's supposed to be in rest, so, second law becomes this:
F = 0
In this case, we have rod and weight so the forces involving here are those, so second law is like this:
T1y + T2y - W = 0
To get the T1y and T2y, we have the angle so:
T1y = 320 sin80° = 315.14 N
T2y = 400 sin80° = 393.92 N
With these values, replace them and we get:
315.14 + 392.92 - W = 0
709.06 - W = 0
W = 709.06 N
