PHYSICS MIDDLE SCHOOL

What is an example of Brownian motion in everday life

Answers

Answer 1
Answer: Flower pollen on water or smoke in a glass box. 
Both show random motions of the flower pollen and smoke due to the random motion of the water and air molecules.Jan Ingenhousz had described the irregular motion of coal dust particles on the surface of alcohol in 1785. Nevertheless Brownian motion is traditionally regarded as discovered by the botanist Robert Brown in 1827. It is believed that Brown was studying pollen particles floating in water under the microscope. He then observed minute particles within the vacuoles of the pollen grains executing a jittery motion. By repeating the experiment with particles of dust, he was able to rule out that the motion was due to pollen particles being 'alive', although the origin of the motion was yet to be explained. Consider a large balloon of 10 meters in diameter. Imagine this large balloon in a football stadium or any widely crowded area. The balloon is so large that it lies on top of many members of the crowd. Because they are excited, these fans hit the balloon at different times and in different directions with the motions being completely random. In the end, the balloon is pushed in random directions, so it should not move on average. Consider now the force exerted at a certain time. We might have 20 supporters pushing right, and 21 other supporters pushing left, where each supporter is exerting equivalent amounts of force. In this case, the forces exerted from the left side and the right side are imbalanced in favor of the left side; the balloon will move slightly to the left. This imbalance exists at all times, and it causes random motion. If we look at this situation from above, so that we cannot see the supporters, we see the large balloon as a small object animated by erratic movement. Now return to Brown’s pollen particle swimming randomly in water. One molecule of water is about .1 to .2 nm, (a hydrogen-bonded cluster of 300 atoms has a diameter of approximately 3 nm) where the pollen particle is roughly 1 micrometer in diameter, roughly 10,000 times larger than a water molecule. So, the pollen particle can be considered as a very large balloon constantly being pushed by water molecules. The Brownian motion of particles in a liquid is due to the instantaneous imbalance in the force exerted by the small liquid molecules on the particle. Okay, I hope that'll answer your question!

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Can someone help me on no. 6

suppose a single light bulb burns out. How do you think this will affect light that are strung along a single wire

Answers

All of the other lights will go out. This is an example of a series circuit. 

Hope this helps! (:

-TotoandFidoLOVE
well if a light burns out you change the bulb

How is science used by a pharmcist

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They have to understand the symptoms if this i s a cure for the medicines i think
to mix different chemicals in order to make a substance which can be tested and turned into a medicine

How can a magnetic feild be used to generate an electric current

Answers

The correct answer is A) When a magnet moves near a wire, it's charging field causes the electrons in the wire to flow as electric current

Lyndon is investigating whether putting plastic on her windows will help seal out cold winter drafts. She covers a window on the south side of her house with plastic and measures the inside temperature near the window. She also measures the inside temperature near a window without plastic on the north side of her house. The windows are the same size and design. Why is this not an ideal controlled investigation? A. The windows should be different sizes to introduce variation. B. The drafts at each window may be different because the windows aren’t near each other. C. Temperature isn’t a good indicator of cold winter drafts. D. Outside temperature is a better indicator of cold winter drafts than inside temperature. E. The type of plastic used in the investigation isn’t mentioned

Answers

Answer:

B. The drafts at each window may be different because the windows aren’t near each other.

Explanation:

The measurement is imprecise since the temperature will be lower in the window that receives the draft directly. that is, if the draft comes from the north, the north window will perceive lower temperatures than the south window.

Answer: B

Explanation: PLATO

A ball is dropped from the top of a tall building. As the ball falls, the upward force of air rsistance becomes equal to the downward pull of gravity. When these two forces become equal in magnitude the ball will: a) flatten due to the forces b) fall at a constant speed c) continue to speed up d) slow to a stop

Answers

fall at a constant speed

Final answer:

When the force of air resistance equals the downward force of gravity, the net force on a falling object becomes zero, meaning it will fall at a constant speed.

Explanation:

The subject of this question is Physics, specifically focusing on the aspects of forces, gravity, and air resistance involved when an object is in free fall. When the magnitude of the upward air resistance equals the downward pull of gravity, the net force on the ball becomes zero. According to Newton's second law of motion, when the net force on an object is zero, its acceleration is also zero, meaning it will not speed up or slow down. In this case, the ball will fall at a constant speed. Therefore, the correct answer is b) fall at a constant speed.

Learn more about Forces in Physics here:

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three places magnets are threatening toy cars as shown below then Jerry measures how far is car rolls when she launches it from the same starting point using the same stretched rubber band how will the force of the rubber band affect the cars

Answers

Some things depend on the band size and the car mass. Other are based on friction, how much force was applied?
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