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alexgriva [62]
3 years ago
15

What are three examples of objects that are too big to be studied without models

Physics
1 answer:
zysi [14]3 years ago
4 0
1.The entire Universe
2. The milky way
3.Time and Space 
hoped this helped

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What is the role of the nervous system?
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A 50.0 N box sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at on
Vikki [24]

Answer:

-4.0 N

Explanation:

Since the force of friction is the only force acting on the box, according to Newton's second law its magnitude must be equal to the product between mass (m) and acceleration (a):

F_f = ma (1)

We can find the mass of the box from its weight: in fact, since the weight is W = 50.0 N, its mass will be

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And we can fidn the acceleration by using the formula:

a=\frac{v-u}{t}

where

v = 0 is the final velocity

u = 1.75 m/s is the initial velocity

t = 2.25 s is the time the box needs to stop

Substituting, we find

a=\frac{0-1.75 m/s}{2.25 s}=-0.78 m/s^2

(the acceleration is negative since it is opposite to the motion, so it is a deceleration)

Therefore, substituting into eq.(1) we find the force of friction:

F_f = (5.1 kg)(-0.78 m/s^2)=-4.0 N

Where the negative sign means the direction of the force is opposite to the motion of the box.

6 0
3 years ago
If a student is walking against the wind, would the student be traveling faster or slower than a person walking with the wind an
Ivahew [28]

Answer:

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Can someone pls help me and give me the answers i will mark brainliest :3
Katyanochek1 [597]

Answer:

with what subject

Explanation:

i really only do ELA and sometimes science

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2 years ago
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