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Elina [12.6K]
3 years ago
11

Pls do this for me i dont understand this

Physics
1 answer:
MissTica3 years ago
7 0
First one: balanced force, as you can see in the picture, the force applied to the box is balanced and not uneven
second one: unbalanced, the forces applied are not even
third: net force

for the definitions, you can search it up on google
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I NEED HELP BADLY
Marrrta [24]

Answer:

a) Andrea's initial momentum, 200 kg m/s

b) Andrea's final momentum, 0

c) Impulse,  = - 200 Ns

d) The force that the seat belt exerts on Andrea, - 400 N

Explanation:

Given data,

The initial velocity of the car is, u = 40 m/s

The mass of Andrea, m = 50 kg

The time period of deceleration, a = 0.5 s

The final velocity of the car, v = 0

a) Andrea's initial momentum,

               p = mu

                  = 50 x 40

                  = 200 kg m/s

b) Andrea's final momentum

                  P = mv

                     = 50 x 0

                    = 0 kg m/s

c) Impulse

                   I = mv - mu

                     = 0 - 200

                    = - 200 Ns

The negative sign indicated that the momentum is decreased.

d) The force that the seat belt exerts on Andrea

                   F = (mv - mu)t

                     = (0 - 200) / 0.5

                     = - 400 Ns

Hence,the force that the seat belt exerts on Andrea is, - 400 N

7 0
3 years ago
Arightward force of 302 N is applied to a 28.6-kg crate to accelerate it across the floor. What will its acceleration be?
Musya8 [376]

Answer:

a \approx 10.6 m/s²

Explanation:

Since F = ma (Force = mass * acceleration), acceleration would be...

a = F/m

a = 302 N/28.6

a \approx 10.6 m/s²

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Answer:

a =  \frac{ {v}^{2} -  {u}^{2}  }{2s}  \\ or \\  a =  \frac{v - u}{t}  \\ say \: a =  - 10m. {s}^{ - 2}  \\  \therefore \: deceleration =  - 10m. {s}^{ - 2}

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adell [148]

Answer:

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Explanation:

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Mandarinka [93]

Modelling the structure of the atom is important because modeling replaces the real system with something similar but easier to examine. Option B

<h3>What is modeling?</h3>

A model is a representation of reality. We know that a model could help us to recreate reality in a manner that we could be able to relate fully with it. A model could be used also a means of explanation.

The atomic models that we have usually help us to understand more abut the atom. Therefore, modelling the structure of the atom is important because modeling replaces the real system with something similar but easier to examine. Option B

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