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tino4ka555 [31]
3 years ago
9

A force AB of length 100m and weight 600N has its centre of gravity 4.0 m from the end, and lies on horizontal ground calculate

the force required to begin to lift the end
Physics
1 answer:
Stells [14]3 years ago
8 0

Answer:

F = 24 N

Explanation:

In this exercise we have a bar l = 100 m with a center of gravity x = 4 m, which force is needed to lift it from the other end

Let's use the rotational equilibrium relationship, where we consider the counterclockwise rotations as positive and fix the reference system at the point closest to the center of gravity

           ∑ τ = 0

           F l -x W = 0

           F = \frac{x}{l} \  W

let's calculate

          F = \frac{4}{100}4/100 600

          F = 24 N

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A plane flying against the wind covers the 900-kilometer distance between two aerodromes in 2 hours. The same plane flying with
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Answer:

The speed of the wind is 25 km/hr.

Explanation:

Let us call v_p the speed of the plane and v_w the speed of the wind. When the plane is flying against the wind, it covers the distance of 900-km in 2 hours (120 minutes); therefore;

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And when the plane is flying with the wind, it covers the same distance in 1 hour 48 minutes (108 minutes)

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From equation (1) we solve for v_p and get:

v_p = \dfrac{900km}{120min}+v_w,

and by putting this into equation (2) we get:

\dfrac{900km}{120min}+v_w+v_w= \dfrac{900km}{108min}

2v_w= \dfrac{900km}{108min}-\dfrac{900km}{120min}

2v_w = 8.3km/min - 7.5km/min

2v_w = 0.83km/min

v_w = 0.4165km/min

or in km/hr this is

\boxed{v_w= 25km/hr }

4 0
3 years ago
When a light ray passes from LESS dense water (n = 1.33) into a MORE dense diamond (n = 2.419) at an angle of 45 degrees, its pa
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3 years ago
Show the equation of simple pendulum to be dimensionally consistent
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T is in seconds (s) 

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<span>L is in meters (m) </span>

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<span>s=sqrt(m/(m/s^2)) </span>

<span>simplify</span>

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<span>s=sqrt(s^2) </span>

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3 years ago
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Answer:

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