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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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Explanation:

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4 0
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A layer of oil (n = 1.38) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid.
Vinil7 [7]

Answer:

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Explanation:

Using Snell's law as:

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Where,  

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{\theta_r} is the angle of refraction  ( 53.0° )

{n_r} is the refractive index of the refraction medium  (unknown liquid, n=?)

{n_i} is the refractive index of the incidence medium (oil, n=1.38)

Hence,  

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A man is dragging a trunk up the loading ramp of a mover’s truck. The ramp has a slope angle of 20.0°, and the man pulls upward
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Answer:

(a)  104 N

(b) 52 N

Explanation:

Given Data

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F makes an angle of 30° with the ramp

The component of F parallel to the ramp is Fx = 90 N.  

The component of F perpendicular to the ramp is Fy.

(a)  

Let the +x-direction be up the incline and the +y-direction by the perpendicular to the surface of the incline.  

Resolve F into its x-component from Pythagorean theorem:  

Fx=Fcos30°

Solve for F:  

F= Fx/cos30°  

Substitute for Fx from given data:  

Fx=90 N/cos30°

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(b) Resolve r into its y-component from Pythagorean theorem:

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   Substitute for F from part (a):

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