2 years ago

Dust settling out of the air chemical change or physical change

Physics

2 answers:

mars1129 [50]2 years ago

7 0

Physical changes: melting, evaporating, and condensation. This is a physical change.

egoroff_w [7]2 years ago

5 0

Physical Change...............................................

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A ball is dropped from a rooftop 60m high. <br> How long is the ball in the air?

alina1380 [7]

Answer: 3.49 s

Explanation:

We can solve this problem with the following equation of motion:

$y=y_{o}+V_{o}t-\frac{1}{2}gt^{2}$ (1)

Where:

$y=0 m$ is the final height of the ball

$y_{o}=60 m$ is the initial height of the ball

$V_{o}=0 m/s$ is the initial velocity (the ball was dropped)

$g=9.8 m/s^{2}$ is the acceleratio due gravity

$t$ is the time

Isolating $t$ :

$t=\sqrt{\frac{2 y_{o}}{g}}$ (2)

$t=\sqrt{\frac{2 (60 m)}{9.8 m/s^{2}}}$ (3)

Finally we find the time the ball is in the air:

$t=3.49 s$ (4)

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3 years ago

20 POINTS!

CaHeK987 [17]

Potential energy is the answer

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3 years ago

List three (3) specific examples of each biological<br> Homeostasis:<br> Metabolism:<br> Growth:

Andre45 [30]

Answer:

Homeostasis: When bacteria or viruses that can make you ill get into your body, your lymphatic system kicks in to help maintain homeostasis.

Metabolism: The processes of making and breaking down glucose molecules are example of metabolism.(respiration and photosynthesis)

Growth:The liver continues to form new cells to replace senescent and dying ones.

Hope these examples help you.

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3 years ago

What is the function of layer of air trapped under the hovercraft

aev [14]

Answer:b

Explanation:

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3 years ago

San Jose to San Francisco is approximately 7200 meters away. If it takes you 3600 seconds to drive by car what is the velocity?

svetlana [45]

V=s/t=>7200/3600=2m/s

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2 years ago