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Alisiya [41]
3 years ago
12

Provide an example of when momentum is conserved and explain your answer you can get 10 PTS if answered with a good explaination

Physics
1 answer:
dezoksy [38]3 years ago
4 0

Answer:

m_1=8\ kg,\ m_2=6\ kg,\ v_1=12\ m/s, v_2=4\ m/s,\ v_1'=-6\ m/s,\ v_2'=28\ m/s

Explanation:

<u>Conservation of Momentum </u>

The total momentum of a system of two particles is

p=m_1v_1+m_2v_2

Where m1,m2,v1, and v2 are the respective masses and velocities of the particles at a given time. Then, the two particles collide and change their velocities to v1' and v2'. The final momentum is now

p'=m_1v_1'+m_2v_2'

The momentum is conserved if no external forces are acting on the system, thus

m_1v_1+m_2v_2=m_1v_1'+m_2v_2'

Let's put some numbers in the problem and say

m_1=8\ kg,\ m_2=6\ kg,\ v_1=12\ m/s, v_2=4\ m/s,\ v_1'=-6\ m/s,\ v_2'=28\ m/s

(8)(12)+(6)(4)=(8)(-6)+(6)(28)

96+24=-48+168

120=120

It means that when the particles collide, the first mass returns at 6 m/s and the second continues in the same direction at 28 m/s

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An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. If the input rms voltage for the 60-t
notka56 [123]

Answer:

720 V

Explanation:

Given that,

The number of turns in primary coil, N₁ = 60

The number of turns in secondary coil, N₂ = 360

The input rms voltage, V₁ = 120 V

We need to find the output rms voltage of the secondary coil . The relation between number of turns in primary coil - secondary coil to the input rms voltage to the output rms voltage is given by :

\dfrac{N_1}{N_2}=\dfrac{V_1}{V_2}\\\\V_2=\dfrac{N_2V_1}{N_2}\\\\V_2=\dfrac{360\times 120}{60}\\\\V_2=720\ V

<h3>So, the output rms voltage of the secondary coil is 720 V. Hence, the correct option is (b).</h3>
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2 years ago
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zvonat [6]

Almost all jobs require that you fill out an _____.;

D. Application

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3 years ago
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What is NOT a 21st-century skill that can help a person thrive today?
Soloha48 [4]

Ability to memorize and regurgitate information on tests is the skill that can’t help a person to thrive today in this modern 21st century.

Answer: Option D

<u>Explanation:</u>

Thriving in this modern 21st century is not as easy as it used to be in the early 20th and 19th centuries.  So there is a need to develop skills like implementing one's knowledge to real-world structures which will sure help a person to understand and explore more.

Statement B also will sure be helpful to survive in modern society and a person can also improve his/her critical thinking, problem solving and other skills to thrive through this century.

But even though memorizing and regurgitating information can help you get good grade it will never be that helpful in other ways, So option D can be concluded as the right answer.

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3 years ago
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Answer:

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Explanation:

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A student sits in a chair that can spin without friction. The student has her hands outstretched and starts rotating at 1.9 rev/
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Answer:

the resulting angular speed after she pulls her hand inwards in (rad/s)  is  27.02 rad/s

Explanation:

Given that :

the initial angular speed \omega_1 = 1.9 \ \ rev/s

Initial rotational inertia I_1 = 12.00 \ \ kg.m^2

Final angular speed \omega_2 = ???

Final rotational inertia I_2 = 5.3 \ \ kg.m^2

According to conservation of momentum :

Initial momentum = final momentum

I_1 \omega_1 = I_2 \omega_2

\omega_2 = \frac{I_1 \omega_1}{I_2}

\omega_2 = \frac{12.00*1.9}{5.3}

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To rad/s ; we have:

1  \   rev/s = 2 \pi \ \  rad/s

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\omega_2 = 27.02  \ \ rad/s

Therefore the resulting angular speed after she pulls her hand inwards in (rad/s) = 27.02 rad/s

8 0
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