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11111nata11111 [884]
3 years ago
15

PLEASE I NEED HELP I AM REALLY STUCK!!!

Physics
1 answer:
AlekseyPX3 years ago
8 0

Answer: Force = Mass X Acceleration

F = 5 x 2

F = 10 N

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Newton's second law: Rudolph the red nosed reindeer is pulling a 25 kg sled across the snow in a field. The coefficient of kinet
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Answer:

F=39,68N

Explanation:

Data:

Mass m=25 Kg

Coefficient of kinetic friction \mu=0.12

Angle = 29^{0}

Acceleration = 0.12 \frac{m}{s^{2} }

Solution:

By Newton's first law we know that for the x-axis:

F_{rope_x}-F_f=F_R Where F_R is the resulting force, and F_f is the friction force.

And for the y-axis:

F_{rope_y}+N=W, where <em>N</em> is the normal force, and <em>W </em>is the weight of the sled.  

We know that the resulting force's acceleration is 0.12 \frac{m}{s^{2} }, and by using Newton's second law, we obtain:

F=m.a

F_R=25Kg. 0.12\frac{m}{s^2} \\ F_R=3N .

Now, the horizontal component of the force in the rope will be given by

F_{rope_x}=F_{rope}.cos(29^0)=F_R+F_f, since the resulting force is completely on the x-axis, and the friction opposes to the speed of the sled.

To obtain the friction force, we must know the normal force:

F_f=\mu. N

Clearing N in the y-axis equation:

N=W-F_{rope_y}=W-F_{rope}.sin(29^0)

So we can express the x-axis equation as follows:

F.cos(29^0)=F_R+\mu.(W-F_{rope}.sin(29^0))

Finally, solving for F we get

F = (F_R + \mu. m.g) / (cos (29^0) + \mu.sin (29^0))

F=39,68N

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