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2 years ago

15

Using information about natural laws, explain why some car crashes produce minor injuries and others produce catastrophic injuri

es.

1 answer:

Nataly_w [17]2 years ago

5 0

Don't they have to pay insurance company if something happens to there car.

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Which apple has the greatest potential energy?

saw5 [17]

D. Because as height increases, so does the potential energy.

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3 years ago

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A spacecraft is traveling in interplanetary space at a constant velocity. What is the estimated distance traveled by the spacecr

zhuklara [117]

What is the constant velocity?
<span>We need that number in order to solve the problem
</span>Or
<span>It has a graph in which it describes the different acceleration</span>

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3 years ago

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A person consumes a snack containing 14 food calories (14kcal). what is the power this food produces if it is to be "burned off"

Inessa05 [86]

Answer:

B) 2.7W

Explanation:

Converting Cal to Joule

1 cal = 4.186J

14 kcal = 14 x 1000 x 4.186

= 58604 J

Converting hour to seconds

6 hours = 6 x 60 x 60 seconds

= 21600 seconds

Power is the time rate of doing work.

Power = Work/Time

P = (58604) / (21600)

P = 2.7W

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3 years ago

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Regions in the milky way where density waves have caused gas clouds to crash into each other are called

Mandarinka [93]

Regions in the milky way where density waves have caused gas clouds to crash into each other are called clumps.Clumps are molecular clouds (interstellar clouds) with higher density,where lots of dust and gs cores resides. These clouds are the beginning of stars.

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3 years ago

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision

Fudgin [204]

Answer:

The average acceleration of the ball during the collision with the wall is $a=2,800m/s^{2}$

Explanation:

<u>Known Data</u>

We will asume initial speed has a negative direction, $v_{i}=-30m/s$ , final speed has a positive direction, $v_{f}=26m/s$ , $\Delta t=20ms=0.020s$ and mass $m_{b}$ .

<u>Initial momentum</u>

$p_{i}=mv_{i}=(-30m/s)(m_{b})=-30m_{b}\ m/s$

<u>final momentum</u>

$p_{f}=mv_{f}=(26m/s)(m_{b})=26m_{b}\ m/s$

<u>Impulse</u>

$I=\Delta p=p_{f}-p_{i}=26m_{b}\ m/s-(-30m_{b}\ m/s)=56m_{b}\ m/s$

<u>Average Force</u>

$F=\frac{\Delta p}{\Delta t} =\frac{56m_{b}\ m/s}{0.020s} =2800m_{b} \ m/s^{2}$

<u>Average acceleration</u>

$F=ma$ , so $a=\frac{F}{m_{b}}$ .

Therefore, $a=\frac{2800m_{b} \ m/s^{2}}{m_{b}} =2800m/s^{2}$

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3 years ago