Answer:
Immune system
Explanation:
Because they defense our body act as 'Police of the body'.
<span>If the forces are acting in exactly opposite directions, they will subtract, and the magnitude of the resultant force is 6 N. This is the minimum resultant force, so that rules out (1). Similarly, if they act in exactly the same direction, they will add, and the resultant force is 18 N. This will be the maximum resultant force. That rules out (3) and (4). Thus, at some angle (between 0 and 180 degrees), you COULD find a resultant force of 15 N.</span>
Answer:
w1 = 4.04 / √r
Explanation:
This exercise should be done using Newton's second law, where the centripetal month acceleration, write the equation for the vertical axis and the radius of rotation
Y Axis
fr - W = 0
fr = W
X axis (radial)
N = m 
The equation for the force of friction is
fr = μ N
Let's replace
μ (m
) = mg
Centripetal acceleration is
= v² / r
v = wr
= w² r
μ w² r = g
w = √(g/μ r)
In order for the trip to be safe, people must not move, so the friction must be static, let's calculate the angular velocity for the extreme values of the friction increase
μ = 0.60
w1 = √ (9.8 / 0.6 r)
w1 = 4.04 / √r
μ = 1.0
w2 = √ (9.8 / 1 r)
w2 = 3.13 / √r
To finish the calculation you need the radius of the cylinder, but for the same radius the safe speed is w1
The answer is: " 5 g / cm³ " .
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Explanation:
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Density = mass divided by volume ; or: "D = m / V " ;
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and is expressed as: "mass per unit volume" ;
The mass, "m", is expressed in units of "g" (grams) ; and
the volume, "V" is expressed in units of "cm³ " or "mL" ; ("cm³ ", in this case);
{Note the exact conversion: " 1 cm³ = 1 mL " .} .
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So, if: the mass, "m = 100 g" {given} ;
and the volume, " V = 20 cm³ " {given} ;
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Plug these values into the formula/equation to solve for the density, "D" ;
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D = m / V = (100 g) / (20 cm³)
= (100 ÷ 20) g / cm³ = 5 g /cm³ .
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The answer is: " 5 g / cm³ " .
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