Answer:
x_total = 20m
Explanation:
This is an exercise in kinematics, we will look for the distance it travels during the reaction time, where there is no braking, and then the distance during the deceleration.
Distance traveled during response time
v = x₁ / t
x₁ = v t
let's calculate
x₁ = 10 0.75
x₁ = 7.5 m
Now we calculate the distance during braking, the final speed is zero (v = 0)
v² = v₀² - 2 a x₂
x₂ = v₀² / 2 a
let's calculate
x₂ = 10² / (2 4)
x₂ = 12.5m
the total stopping distance is
x_total = x₁ + x₂
X_total = 7.5 + 12.5
x_total = 20m
We have that for the Question "In the same year, the average finishing <em>time</em> for U.S. women was 4 <u>hours </u>and 41 <em>minutes</em>. What was the average female speed in miles per <em>hour</em>?" it can be said that
The average female speed in miles per hour
From the question we are told
In the same year, the <u>average</u> finishing <em>time</em> for U.S. women was 4 <u>hours </u>and 41 <em>minutes</em>. What was the average female speed in <u>miles</u> per <em>hour</em>?
<h3>Average speed </h3>
This is defined as the collective <u>mean</u> of different travel <em>intervals </em>
Generally the equation for Speed is mathematically given as
V=\frac{Distance}{Time}
Therefore
For 4 <u>hours </u>and 41 <em>minutes=4.683hours</em>
This travels time was <em>obtained </em>over a series of distance
<em>Hence</em>
<em>Distance D</em>
The average female <em>speed</em> in miles per hour
For more information on speed visit
brainly.com/question/7359669
Answer:
a) W = 40.49 10² J and b) W₂ = - 3308.7 J
Explanation:
The equation for work is
W = F. d
Bold indicates vectors, we can also write that equation with the modules
W = F d cos θ
Where θ is the angle between force and displacement
a) Traction reinforcement work
W = 3.59 10² 12.3 cos 23.5
W = 40.49 10² J
b) frictional force work, we have to use Newton's second law to find the friction force
Y Axis
N-W = 0
N = W
The formula for friction force is
fr = μ N
fr = μ mg
fr = 0.289 95.0 9.8
fr = 269 N
The friction force opposes the movement, so that at an angle it is 180º
W₂ = fr d cos T
W₂ = 269 12.3 cos 180
W₂ = - 3308.7 J
Answer:
Explanation:
Inertia is the property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity.
The more mass, the more inertia. If you increase the mass of the object then you increase the inertia.
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