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3 years ago

Scientist have changed the model of the atom.what experimental evidence led them to change from the previous model .

1 answer:

7 0

Rutherford's model of the atom (ESAAQ) Rutherford carried out some experiments which led to a change in ideas around the atom. His new model described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.

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In science, does acceleration happen when an object is slowing down?

Irina18 [472]

Answer:

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.

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2 years ago

What equation represents the law of conservation of energy in closed system

svetoff [14.1K]

The first option.

The total mechanical energy before an action (which makes up PE and KE) equals the total mechanical energy after an action.

KEi + PEi = KEf + PEf

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3 years ago

To determine a waves' frequency, you must know the

kykrilka [37]

B. number of oscillations in a given period of time.

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3 years ago

Read 2 more answers

When the ambulance passes the person (switching from moving towards him to moving away from him), the perceived frequency of the

dlinn [17]

To develop this problem we will apply the considerations made through the concept of Doppler effect. The Doppler effect is the change in the perceived frequency of any wave movement when the emitter, or focus of waves, and the receiver, or observer, move relative to each other. At first the source is moving towards the observer. Than the perceived frequency at first

$F_1 = F \frac{{343}}{(343-V)}$

Where F is the actual frequency and v is the velocity of the ambulance

Now the source is moving away from the observer.

$F_2 = F\frac{343}{(343+V)}$

We are also so told the perceived frequency decreases by 11.9%

$F_2 = F_1 - 9.27\% \text{ of } F_1$

$F_2 = F_1-0.0927F_1$

$F_2 = 0.9073F_1$

Equating,

$F\frac{343}{(343+V)}= 0.9073(F\frac{343}{(343-V)})$

$\frac{1}{(343+V)}= 0.9073\frac{1}{(343-V)}$

$0.9073(343+V) = 343-V$

$(0.9073)(343)+(0.9073)V = 343-V$

$V+0.9073V = 343-(0.9073)(343)$

Solving for V,

$V = 16.67 m/s$

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2 years ago

I NEED. HELP PLEASE, THANKS! :)<br> Describe each Newton Law.

SSSSS [86.1K]

Answer:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction

Explanation:

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2 years ago