⭕️ EUEE GRADE 12 ENTRANCE EXAM (2011EC)

ALL pages in one. Prepared by entrance preparation team.
Join - @ETHIO_PHYSICS
SUBJECT- english
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

⭕️ EUEE GRADE 12 ENTRANCE EXAM (2011EC)

ALL pages in one. Prepared by entrance preparation team.
Join - @ETHIO_PHYSICS
SUBJECT- maths
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

⭕️ EUEE GRADE 12 ENTRANCE EXAM (2011EC)

ALL pages in one. Prepared by entrance preparation team.
Join - @ETHIO_PHYSICS
SUBJECT- physics
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

⭕️ EUEE GRADE 12 ENTRANCE EXAM (2011EC)

ALL pages in one. Prepared by entrance preparation team.
Join - @ETHIO_PHYSICS
SUBJECT- biology
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

⭕️ EUEE GRADE 12 ENTRANCE EXAM (2011EC)

ALL pages in one. Prepared by entrance preparation team.
Join - @ETHIO_PHYSICS
SUBJECT- chemistry
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

GRADE 12

#vid1

electric current and magnetism

Join - @ETHIO_PHYSICS

SUBJECT- physics

➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇

@ETHIO_PHYSICS

GRADE 12

#vid2

electric current and magnetism

Join - @ETHIO_PHYSICS

SUBJECT- physics

➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇

@ETHIO_PHYSICS

What is space?

Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework.

#nardoszerihun , @ethiophysics_bot for any questions u have

👉@ethio_physics

Reference for G-11 and G-12

Join - @ETHIO_PHYSICS

Subject - Chemistry
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

Reference for G-11 and G-12

Join - @ETHIO_PHYSICS

Subject - Algebra
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

Reference for G-11 and G-12

Join - @ETHIO_PHYSICS

Subject - Biology
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

Reference for G-11 and G-12

Join - @ETHIO_PHYSICS

Subject - Physics
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

Short note - G12

Join - @ETHIO_PHYSICS

Subject - Physics
➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS

#Physics for #grade_12👇👇

#Q1

Two wires, both carrying current out of the page, have a current of magnitude 5.0 mA. The first wire is located at (0.0 cm, 3.0 cm) while the other wire is located at (4.0 cm, 0.0 cm). What is the magnetic force per unit length of the first wire on the second and the second wire on the first?

#Q2

The output of an ac generator connected to an RLC series combination has a frequency of 200 Hz and an amplitude of 0.100 V. If R = 4.00 Ω, L = 3.00 × 10−3 H, and C = 8.00 × 10−4 F, what are
(a) the capacitive reactance,
(b) the inductive reactance,
(c) the impedance,
(d) the current amplitude, and
(e) the phase difference between the current and the emf of the generator?

#Q3

Is the magnetic field inside a toroid completely uniform? Almost uniform?

#Q4

Curves on some test tracks and race courses, such as Daytona International Speedway in Florida, are very steeply banked. This banking, with the aid of tire friction and very stable car configurations, allows the curves to be taken at very high speed. To illustrate, calculate the speed at which a 100.0-m radius curve banked at 31.0° should be driven if the road were frictionless.

#Q5

The Curiosity rover was deployed on Mars on August 6, 2012. The wheels of the rover have a radius of 25 cm. Suppose astronauts arrive on Mars in the year 2050 and find the now-inoperative Curiosity on the side of a basin. While they are dismantling the rover, an astronaut accidentally loses a grip on one of the wheels, which rolls without slipping down into the bottom of the basin 25 meters below. If the wheel has a mass of 5 kg, what is its velocity at the bottom of the basin?

#Q6

How much energy is required to lift the 9000-kg Soyuz vehicle from Earth’s surface to the height of the ISS, 400 km above the surface?

#Q7

Determine the semi-major axis of the orbit of Halley’s comet, given that it arrives at perihelion every 75.3 years.
If the perihelion is 0.586 AU, what is the aphelion?

#Q8

Gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 × 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that in the actual operation of an automobile engine, the compression is not quasi-static, although we are making that
assumption here.
(a) What are the pressure and temperature of the mixture after the compression?
(b) How much work is done by the mixture during the compression?

--------------------------

Physics for grade 12

#part_one #8questions

submit your answer via 👉 @the_physicist_bot

#addisdamtew

Join us 👉 @ethio_physics

The universe is so vast it’s extremely difficult to know the full extent of its complexities. Humans can only scratch at the surface of its immensity, but whenever we do we pick up remarkable information, and images, which are awe inspiring and baffling in equal measure. What we do know has been made readily available to the public thanks to the leading space exploratation organisations, so here are 6 of the most intriguing facts for your reading pleasure.

1. When you look into the night sky, you are looking back in time


The stars we see in the night sky are very far away from us, so far the star light we see has taken a long time to travel across space to reach our eyes. This means whenever we look out into the night and gaze at stars we are actually experiencing how they looked in the past. For example, the bright star Vega is relatively close to us at 25 light-years away, so the light we see left the star 25 years ago; while Betelgeuse (pictured) in the constellation of Orion is 640 light-years away, so the light left the star around 1370, during the time of the Hundred Years’ War between England and France. Other stars we see are further away still, so we are seeing them much deeper in their past.

2. The Hubble telescope allows us to look back billions of years into the past


The Hubble Telescope enables us to look towards very distant objects in the universe. Thanks to this remarkable piece of engineering NASA has been able to create some incredible images, one of which is the Hubble Ultra Deep Field. Created using images from the telescope from 2003 and 2004, the incredible picture displays a tiny patch of the sky in immense detail; it contains 10,000 objects, most of them young galaxies, and acts as a portal back in time. In one picture we are transported 13 billion years into the past, just 400 to 800 million years after the Big Bang, which is early in terms of the universe’s history.

3. You can watch the Big Bang on your television


Cosmic background radiation is the afterglow and heat of the Big Bang, the momentous event that kick-started our universe 13.7 billion years ago. This cosmic echo exists throughout the universe, and amazingly we can use an old-fashioned television set to catch a glimpse of it. When a television is not tuned to a station you can see the black and white fuzz and clacking white noise, around 1% of this interference is made up cosmic background radiation – the afterglow of creation.

4. There’s a giant cloud of alcohol in Sagittarius B


Sagittarius B is a vast molecular cloud of gas and dust floating near the centre of the Milky Way, 26,000 light-years from Earth, 463,000,000,000 kilometres in diameter and, amazingly, it contains 10-billion-billion-billion litres of alcohol. The vinyl alcohol in the cloud is far from the most flavoursome tipple in the universe, but it is an important organic molecule which offers some clues how the first building blocks of life-forming substances are produced.

5. There’s a planet-sized diamond in Centaurus named after a Beatles song


Astronomers have discovered the largest known diamond in our galaxy, it’s a massive lump of crystallised diamond called BPM 37093, otherwise known as Lucy after The Beatles’ song Lucy in the Sky with Diamonds. Found 50 light-years away in the constellation of Centaurus, Lucy is about 25,000 miles across, so much larger then planet Earth, and weighs in at a massive 10 billion-trillion-trillion carats.

6. It takes 225 million years for our Sun to travel round the galaxy


Whilst the Earth and the other planets within our solar system orbit around the Sun, the Sun itself is orbiting around the centre of our galaxy, the Milky Way. It takes the Sun 225 million years to perform a complete circuit of the galaxy. The last time the Sun was in its current position in the galaxy the super-continent Pangaea was just about starting to break apart and early dinosaurs were making an appearance.

#nardoszerihun , @ethiophysics_bot for any questions you have

👉@ethio_physics

📖 Physics for grade 9 👇👇

#Q1

A car traveling at 27 m/s collides with a building. The collision with the building causes the car to come to a stop in approximately 1 second. The driver, who weighs 860 N, is protected by a combination of avariable-tension seatbelt and an airbag. In effect, the driver collides with the seatbelt and airbag and not with the building. The airbag and seatbelt slow his velocity, such that he comes to a stop in approximately 2.5s.
a. What average force does the driver experience during the collision?
b. Without the seatbelt and airbag, his collision time (with the steering wheel) would have been approximately 0.20 s. What force would he experience in this case?

#Q2

Consider the pressure and force acting on the dam retaining a reservoir of water. Suppose the dam is 500-m wide and the water is 80.0-m deep at the dam.
(a) What is the average pressure on
the dam due to the water?
(b) Calculate the force exerted against the dam.

#Q3

What force must be applied to a 100.0-kg crate on a frictionless plane inclined at 30° to cause an acceleration of 2.0 m/s² up the plane?
------------------------


Physics for grade 9

submit your answer 👉 @the_physicist_bot

#addisdamtew

Join us 👉 @ethio_physics

the death of corpuscular theory🤓
#by_addisdamtew

ለመጀመሪያ ጊዜ ብርሃን ከቅንጣጢት(particle) እንደተሠሩ መነገር የጀመረው በ sir Isaac Newton ነበር። ኒውተን በሰዓቱ እነዚህን ቅንጣጢቶች corpuscles በሎ ሰይሟቸው ነበር። ከሱ በፊት ግን Christian Huygens የተባለ Dutch physicist ከ100 አመት በፊት ብርሃን wave እንደሆኑ የራሱን ሀሳብ አስቀምጦ ነበር። ለዚህም ሁለት ምክንያቶች አስቀምጧል ።
● 1- ብርሃን በvacuum ውስጥ ይተላለፋል
● 2- አንድ ነገር ብርሀን ሲያገኘው የጥላ( shadow) መፈጠር ናቸው።

#ኒውተን በዛ ጊዜ የነበረውን እውቅና ተጠቅሞ ለብርሀን wave መሆን የተሰጡትን ም/ቶች በራሱ አገላለጽ ውድቅ ማድረግ ችሎ ነበር። እነዚህም reflection and refraction ነበሩ።

#Reflection ማለት አንድ ነገር ሌላ ነገር ላይ ነጥሮ መመለስ ማለት ነው። ኒውተን ይህን ሲገልፅ እነዚህ corpuscles የተባሉ particles እንደ ኳስ ብናስባቸው ነጥረው ይመለሳሉ፤ የሚል ማብራሪያ ሰጥቷል።
ሌላው ና አስቸጋሪው ሀሳብ #refraction ሲሆን፤ ኒውተን ይህን ፅንሰ ሀሳብ ሲገልፀው እንዲህ ብሎ ነበር "ብርሀን optically dense በሆኑ እቃዎች ላይ (but it must be transparent)ሲያልፍ በdownward force ተገፍቶ በእቃው ውስጥ ይተላለፋል።" ለምሳሌ ብርሀን በውሀ ውስጥ መተላለፍ ሊጠቀስ ይችላል። በኒውተን አገላለፅ የብርሀን ፍጥነት እንደ material ይለያያል የሚል ነበር።
አይ ኒውተን የምር አድናቂህ ነኝ በጣም፤ በነገራችን ላይ ኒውተን ምንም እንኳን ይህ ሀሳቡ ስህተት ቢሆንም he is a great natural philosopher of all time.
የኒውተን corpuscular theory ለ100 አመታት ከቆየ በሗላ Thomas Young የተባለ polymath በ1801 ውድቅ አድርጎበታል።

Young በ1801 double slit experiment የተባለ ሙከራ አካሂዶ ነበር። እንደገና በ1820 the French physicist Augustin Fresnel ብርሀን wave ሆኖ ጥላ እንደሚፈጠር mathematical explanation ሠጠ። የYoung double slit experiment(በሁለት ሽንቁር የተካሄደ ሙከራ እንደማለት ነው) ይህን በአጭሩ ስንመለከት፦ Young ሁለት ቀዳዳዎችን አዘጋጀ፤ በመቀጠልም በሁለቱ ቀዳዳዎች ውስጥ ብርሃን አሣለፈ። በሁለቱም ቀዳዳዎች ውስጥ ያለፈው ብርሀን ከሁለቱ ወጥቶ ሲገናኙ interference ፈጠሩ። ሁለት አይነት interference አሉ እነሡም ፦
#Constructive_interference(maxima) and #Destructive_interference(minima) ናቸው። interference ሊፈጠር የሚችለው በWave ብቻ ነው። Young experiment ከሠራ በሗላ constructive interference አገኘ። ከዚያም ብርሀን wave ነው ለሚለው ሀሣብ ደጋፊ ሆነለት። however, we can see interference pattern in a single slit too. ከዛ በኋላም interferometer የተባለ መሣሪያ ተሠርቷል። ታዋቂው ደሞ Michelson interferometer ነው።
መቼስ special relativity ሲነሳ Michelson ትዝ ማይለው የለም! He was the first person to invent interferometer. It is used to determine the wavelength of the light. ሌላው አስገራሚ ነገር thin film interference ሲሆን የሳሙና bubbles ላይ colourful pattern እንድናይ ያደረጋል።

#PLEASE
#STAY_HOME
#STAY_SAFE
#addisdamtew

if u have any questions please feel free to contact us. 👉 @the_physicist_bot

Join us 👉 @ethio_physics

*IAAC Competition 2020*

The International Astronomy and Astrophysics Competition gives you the unique opportunity to show your knowledge and astronomy skills! The IAAC is an online astronomy competition for students from all countries. Win awards and cash prizes or become IAAC ambassador in your country!

*Who can participate?*

In order to participate in the International Astronomy and Astrophysics Competition, you have to be a high-school or university student. Students from all grades and all countries are invited to participate! There are two age categories:

Junior: under 18 years on 15. May 2020 (submission deadline)

Youth: over 18 years on 15. May 2020 (submission deadline)

Depending on your age category you will have to score more points to qualify for the next round. To solve the problems you should be interested in astronomy, smart, and creative. You should also have a working internet connection to submit your solution online via the submission form: Qualification Round 2020

*Prizes and Awards*

All participants receive participation certificates. The best students receive the 1. prize, 2. prize, and 3. prize with a cash award of 200 USD, 150 USD, and 100 USD. Furthermore, the most outstanding participants from each global region (Africa, America, Europe, Greater Middle East, South Asia, South East Asia) receive the regional award to honor their excellence.

For more information visit : iaac.space

Follow this link to join my WhatsApp group: https://chat.whatsapp.com/KsF8YprVXybKFIroOGUTLy

Grade 8👇👇👇

Short note - Grade 8

Join - @ETHIO_PHYSICS

➖➖➖➖➖➖➖➖➖
↗️ Share 👇👇
@ETHIO_PHYSICS