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Margaret [11]
2 years ago
13

A box, initially at rest, has 36.7 N of force exerted on it for 2.81 s. If the box has a mass of 7.41 kg, what was its velocity

at this time?
Physics
2 answers:
ElenaW [278]2 years ago
8 0

Answer:

13.91 m/s

Explanation:

First we need to find the acceleration:

Acceleration = Force/mass

Acceleration = 36.7N/7.41 kg

Acceleration = 4.95 m/s² (rounded to two decimal places)

Then we find the velocity:

Velocity = Acceleration * Time

Velocity = 4.95 m/s² * 2.81 s

Velocity = 13.91 m/s (rounded to two decimal places)

Oksanka [162]2 years ago
7 0

Hi there!

We can begin by calculating the acceleration of the box using Newton's Second Law:

\large\boxed{\Sigma F = ma}

∑F = Net force (N)

m = mass (kg)

a = acceleration (m/s²)

Rearrange to solve for acceleration:

\frac{\Sigma F}{m} = a\\\\\frac{36.7}{7.41} = 4.95 m/s^2

Now, we can use the kinematic equation:

v_f = v_0 + at

vf = Final velocity (? m/s)

v0 = initial velocity (0 m/s, from rest)

a = acceleration (m/s²)

t = time (s)

Plug in the values:

v_f = 0 + 4.95(2.81)\\\\v_f = \boxed{13.91 m/s}

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Kinetic energy is given as = \frac{1}{2} 0.012 kg * 35000*35000 m/[tex] s^{2}
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Explanation:

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The velocity vector of an object with a centripetal acceleration is never tangent to the circular path.
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<em>The velocity vector of an object with a centripetal acceleration is never tangent to the circular path is False.</em>

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Explanation:

Centripetal acceleration is a feature of objects in uniform circular motion. In that case velocity is along the tangent drawn to the circular path. For an object to be called accelerating its velocity should be variable but speed needn’t.  

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Explanation:

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1) If a sound with the same amplitude and energy is propagated at a source, predict through which medium the sound will travel t
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Answer:

denser media the speed is greater

Explanation:

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  v= \sqrt{\frac{B}{\rho} }

where B is the volume modulus and ρ the density of the medium

When analyzing the previous expression, the amplitude of the sound depends on the energy carried by the wave.

Wave speed, is given by the relationship between two magnitudes, we analyze their values ​​for different media. The volume modulus for gases has values ​​of the order of 10⁵ Pa, for liquids of the order of 10⁹ Pa and for solids of 10¹⁰ to 10¹¹ Pa, while the density has values ​​of the order of 10⁻¹ to 10⁰ kg / m³ for gases for liquids 10³ kg / m³ and for solids of the order of 10³ to 10⁴ kg / m³

 

let's find the order of magnitude of the speed of sound

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