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Semenov [28]
3 years ago
12

Please help, it's grade 7 science. :)

Physics
2 answers:
ANTONII [103]3 years ago
5 0
I just checked the other persons work and it’s correct you should use their work I was just checking if it was right and if I needed to correct anything
xeze [42]3 years ago
4 0

Answer:

The air in the soccer ball in cold weather will decrease slightly in size and it becomes flat. The air in the soccer ball in hot weather will seem flat because the low preasure leads to lower bounce in the ball.

The metal door frame in cold weather contracts and the wood contracts more in the winter. The metal door frame in hot weather thermal blowing can occur on the outer surface of the metal door frame. Hopefully that is what you were looking for have a good day.

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A rock falls for 1.43 seconds how far did it fall? The falls's velocity is an acceleration of -9.81 m/s2
BartSMP [9]

Answer:

s = -0.100 \  m

Explanation:

Generally from kinematics equations we have that

          s = ut + \frac{1}{2}gt^2

Here u is the initial velocity of the rock and the value is  0 m/s given that there was no information that it was in motion before the fall

substituting 1.43 s for t and -9.8m/s^2 for g we have that

         s = 0 *1.43 + \frac{1}{2}(-9.8)*(0.143)^2

=>     s = -0.100 \  m

The negative sign show that the displacement is in the direction of the negative y-axis

 

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<h2>precipitation reactions</h2>

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You would have a 92.8, or a 93.
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