PHYSICS HIGH SCHOOL

Based on the article "Will the real atomic model please stand up?,” describe what Dalton’s theory states about a molecule of water.

Answers

Answer 1
Answer:

Answer:

Dalton’s theory about compounds tells us that all water molecules have different kinds of atoms, two hydrogen atoms for every one oxygen atom.

Explanation:
Answer 2
Answer:

Answer:

Sample Response: Dalton’s theory about compounds tells us that all water molecules have different kinds of atoms, two hydrogen atoms for every one oxygen atom.

Explanation:

its literally the sample response

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When starting a heavy train, why will train engineers sometimes back up, stop, and then proceed forward? (This technique is called "bunching slack.")

Answers

it is kind of in the name. it brings the cars closer together then continues to go forward.
maybe....
when going in reverse it makes a tiny gap between each boxcar, then when going forward it pushes or pulls each car one at a time to build momentum rather than moving them all at once...not sure

A motorbike is traveling to the left with a speed of 27.0 m s 27.0 s m ​ 27, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when the rider slams on the brakes. The bike skids 41.5 m 41.5m41, point, 5, start text, m, end text with constant acceleration before it comes to a stop. What was the acceleration of the motorbike as it came to a stop?

Answers

Answer:

Explanation:

Initial velocity , u = 27 m/s

displacement before stop,  s = 41.5 m .

final velocity,  v = 0

acceleration a = ?

v² = u² + 2 a s

0 = 27² + 2 x a x 41.5

a = - 27² / 2 x 41.5

= - 8.78 m /s

suppose you sit on a rotating stool, holding a big mass in each outstretched hand. if you suddenly drop the masses, will your angular velocity increase, decrease, or stay the same? explain.

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Answer:

When the masses drop, they move with the same angular velocity as you before hitting the ground. i.e., they leave your hand with their angular momentum. So, in one view, you can think the mass decreases, which means the moment of inertia also decreases. Therefore, the angular velocity should increase.

How do scientific tests help determine the properties of substances

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It can help determine substances that appear similar but react differently under the same circumstances.

The variable that is observed or measured during an experiment is called what type of variable?a. independent
c. controlling
b. manipulated
d. dependent

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The correct answer for the question that is being presented above is this one: "d. dependent." The dependent variable is that one that is being measured in an experiment and which is influenced by the independent variable - the experiment measures the effect of the independent variable on the dependent variable.

Answer to number 8 please

Answers


Acceleration = (change in speed) / (time for the change)

(Note:  That's all the Physics there is to this problem.
The rest is all arithmetic.)
=======================================

change in speed = (40 - 20) miles/hour = -20 miles/hour
time for the change = 10 minutes

Acceleration =  (-20 miles/hour) / (10 minutes) =

                          -2 miles/hour per minute .

That's a perfectly good and technically correct expression for acceleration.
But obviously the units might make some people dizzy.  So let's try to
clean it up a little.

Notice that 10 minutes is 1/6 of an hour.
So we could write the acceleration as

Acceleration = (-20 miles/hour) / (1/6 hour) = -120 miles/hour per hour =

                         -120 miles/hour² .

You could convert this into any units you like.  It's really not a physics problem
any more, it's just an exercise in converting units.
First segment: The airplane is descending slowly, with time and distance at a 3:1 ratio. It is probably approaching the airport

Second segment: The airplane is maintaining its altitude. It is probably waiting for the other planes to clear away

Third segment:The airplane descending rapidly, with time and distance at a 1:2 ratio. It is probably landing

Sorry, my bad.
To find acceleration, we use v2-v1 /t
40mph - 20mph / 10 min
20mph/10min
We can convert this to 20/6 miles per 10 minutes, and cancel out the 10 min to 20/6 miles, which is 10/3 miles
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