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sergij07 [2.7K]

2 years ago

14

কে প্রথম Anti particle এর অস্তিত্ব ঘোষণা করেন?

2 answers:

const2013 [10]2 years ago

8 0

Answer:

Is this a joke? Because if ur on brainly for english users you should change that

Explanation:

vaieri [72.5K]2 years ago

7 0

Answer:

Who first announced the existence of Anti particle?

কে প্রথম Anti particle এর অস্তিত্ব ঘোষণা করেন?

Explanation:

Anderson briefly announced in Science [1] his discovery of “easily deflectable positives,” following up with a full paper in the Physical Review that carefully analyzed the balance between the particles' mass and speed and their energy loss along the tracks.

অ্যান্ডারসন বিজ্ঞানে সংক্ষিপ্তভাবে ঘোষণা করেছিলেন [1] শারীরিক পর্যালোচনায় একটি সম্পূর্ণ কাগজ যা "কণাগুলির ভর এবং গতি এবং ট্র্যাকগুলির সাথে তাদের শক্তি হ্রাসের মধ্যে ভারসাম্যটি সতর্কতার সাথে বিশ্লেষণ করেছিল তার একটি সম্পূর্ণ কাগজ সহ।

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Answer:

3 fans per 15 A circuit

Explanation:

From the question and the data given, the light load let fan would have been

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Next, we add the current of the fan motor to it, so,

2 A + 1.8 A = 3.8 A.

Since the devices are continuos duty and the circuit current must be limited to 80%, then the Breaker load max would be

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2 years ago

Questions<br> 2.<br> Rewrite the following quantities using suitable<br> prefixes<br><br> 5000 000

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Explanation:

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Hope this helps

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2 years ago

You decide to impress Grandpa by showing him how fast sound travels. You have a piece of plastic pipe with an adjustable closed

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2 years ago

Compare a cup of hot coffee with the Pacific Ocean. Which statement about thermal energy and temperature is correct?

Keith_Richards [23]

The answer is D

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3 years ago

Two ice skaters, Daniel (mass 70.0 kg) and Rebecca (mass 45.0 kg), are practicing. Daniel stops to tie his shoelace and, while a

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Answer:

a) $v=7.32m/s$

b) $\alpha =-35$ º

c) $ΔK=-1094.62J$

Explanation:

From the exercise we know that the collision between Daniel and Rebecca is elastic which means they do not stick together

So, If we analyze the collision we got

$p_{1x}=p_{2x}$

To simplify the problem, lets name D for Daniel and R for Rebecca

a) $p_{D1x}+p_{R1x}=p_{D2x}+p_{R2x}$

Since Daniel's initial velocity is 0

$m_{R}v_{Rx}=m_{D}v_{D2x}+m_{R}v_{R2x}$

$v_{D2x}=\frac{m_{R}*v_{R1x}-m_{R}*v_{R2x}}{m_{D}}$

$v_{D2x}=\frac{(45kg)(14m/s)-(45kg)(8cos(55.1)m/s)}{(70kg)}=6m/s$

Now, lets analyze the movement in the vertical direction

$p_{1y}=p_{2y}$

Since $p_{1y}=0$

$0=m_{D}v_{D2y}+m_{R}v_{R2y}$

$v_{D2y}=-\frac{m_{R}v_{2Ry}}{m_{D}}=-\frac{(45kg)(8sin(55.1)m/s)}{(70kg)}=-4.21m/s$

Now, we can find the magnitude of Daniel's velocity after de collision

$v_{D}=\sqrt{(6m/s)^2+(-4.21m/s)^2}=7.32m/s$

b) To know whats the direction of Daniel's velocity we need to solve the arctan of the angle

$\alpha =tan^{-1}(\frac{v_{y}}{v_{x}})=tan^{-1}(\frac{-4.21}{6})=-35$ º

c) The change in the total kinetic energy is:

ΔK= $K_{2}-K_{1}$

ΔK= $\frac{1}{2}[(45kg)(8m/s)^2+(70kg)(7.32m/s)^2-(45kg)(14m/s)^2]=-1094.62J$

That means that the kinetic energy decreases

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2 years ago