Exam Hub - High School

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Updated: May 16, 2026 at 1:10 AM

Exam Hub - High School

🎓Exam Hub Your dedicated platform for comprehensive exam preparation! This channel supports Ethiopian high school students through our specialized exam-taking system designed to boost academic performance. ✅ https://exam-hub.et/

@Exam_Hub_Com offers specialized information about platform and preparation for subscribers interested in Competitive Exams

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May 22, 2026, 05:15 AM

⚠️ ትኩረት ለተማሪዎች!

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Exam Hub - High School

May 22, 2026, 05:15 AM

በየዓመቱ በሺዎች የሚቆጠሩ ተማሪዎች ለተጨማሪ ትምህርት (Tutorial) እና ለኮርሶች በሺዎች የሚቆጠር ብር ያፈሳሉ። ውጤቱ ግን ምን ሆነ? አብዛኛው ተማሪ ይወድቃል! ለምን መሰላቹ? ምክንያቱም እውነተኛውን የፈተና አሰራር እና ያለፉ ዓመታትን ጥያቄዎች በስርዓት ስለማይለማመዱ! ያለ ዝግጅት ወደ ፈተና አዳራሽ መግባት... ራስን ወደ ውድቀት መወርወር ስለሆነ ነው።

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Exam Hub - High School

May 22, 2026, 05:15 AM

🎓Exam Hub

Your dedicated platform for comprehensive exam preparation! This channel supports Ethiopian high school students through our specialized exam-taking system designed to boost academic performance.

✅ https://exam-hub.et/

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Exam Hub - High School

May 22, 2026, 05:15 AM

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Sample Chemistry Exams! Entrance Level Exams!

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May 22, 2026, 05:15 AM

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May 22, 2026, 05:15 AM

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May 7, 2026, 05:53 PM

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May 7, 2026, 05:53 PM

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May 7, 2026, 05:53 PM

በየዓመቱ በሺዎች የሚቆጠሩ ተማሪዎች ለተጨማሪ ትምህርት (Tutorial) እና ለኮርሶች በሺዎች የሚቆጠር ብር ያፈሳሉ። ውጤቱ ግን ምን ሆነ? አብዛኛው ተማሪ ይወድቃል! ለምን መሰላቹ? ምክንያቱም እውነተኛውን የፈተና አሰራር እና ያለፉ ዓመታትን ጥያቄዎች በስርዓት ስለማይለማመዱ! ያለ ዝግጅት ወደ ፈተና አዳራሽ መግባት... ራስን ወደ ውድቀት መወርወር ስለሆነ ነው።

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May 7, 2026, 05:53 PM

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May 1, 2026, 03:29 PM

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Exam Hub - High School

May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

⚠️ ትኩረት ለተማሪዎች!

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Exam Hub - High School

May 1, 2026, 03:29 PM

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የ12ኛ ክፍል ፈተና የሚሰጥበት ቀን ይፋ ሆነ።

የሁለተኛ ደረጃ ትምህርት ማጠናቀቂያ ሠርተፊኬት (12ኛ ክፍል ፈተና) ከሰኔ 24 እስከ ሃምሌ 17 ቀን 2018 ዓ/ም ድረስ እንደሚሰጥ የትምህርት ምዘናና ፈተናዎች አገልግሎት አሳውቋል።

በሌላ በኩል፦

- የሬሜዲያል ፕሮግራም ሀገር አቀፍ ፈተና ከግንቦት 17 እስከ ግንቦት 20 ቀን 2018 ዓ/ም

- የቅድመ ምረቃ ትምህርት መውጫ ፈተና ከሰኔ 2 እስከ ሰኔ 12 ቀን 2018 ዓ/ም

- የድህረ ምረቃ ትምህርት መግቢያ ፈተና (NGAT) ከሃምሌ 29 እስከ ሃምሌ 30 ቀን 2018 ዓ/ም

- የመሰረታዊ የንባብና የስሌት ክህሎት ምዘና ጥናትና ምርምር መረጃ መሰብሰብ ከሚያዚያ 26 እስከ ግንቦት 7 ቀን 2018 ዓ/ም

ቲክቫህ ኢትዮጵያ
ሚያዚያ 16 ቀን 2018 ዓ.ም

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May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

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May 1, 2026, 03:29 PM

Congratulations to fitsum z**** for scoring 90.0% on the Physics Trial Exam! 🎉📚 They are now in the top 1% of our 8.9k community. Are you on the leaderboard? 🏆

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Apr 20, 2026, 11:23 PM

❗️ New Question is Coming 🔥 Physics, Chemistry, Math

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Apr 20, 2026, 11:23 PM

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⁉️Practice

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Apr 20, 2026, 11:23 PM

📚 PHYSICS GRADE 12 - WORK, ENERGY AND POWER

━━━━━━━━━━━━

🔬 𝟏. 𝐖𝐎𝐑𝐊 (W)

Definition: Work is done when a force causes displacement in the direction of the force.

Formula: W = F × d × cos(θ)

Where:

• F = applied force (N)
• d = displacement (m)
• θ = angle between force and displacement

Key Points:
• Work is a SCALAR quantity
• Unit: Joule (J) = 1 N·m
• +W when force and displacement are in same direction
• −W when force opposes motion
• Zero work when θ = 90° (force perpendicular to motion)

━━━━━━━━━━━

🔬 𝟐. 𝐊𝐈𝐍𝐄𝐓𝐈𝐂 𝐄𝐍𝐄𝐑𝐆𝐘 (KE)

Definition: Energy possessed by a body due to its motion.

Formula: KE = ½mv²

Where:

• m = mass (kg)
• v = velocity (m/s)

Key Points:
• KE is always POSITIVE (since v² is always +)
• KE = 0 when body is at rest
• Doubles when velocity doubles (because v²)

━━━━━━━━━━━

🔬 𝟑. 𝐏𝐎𝐓𝐄𝐍𝐓𝐈𝐀𝐋 𝐄𝐍𝐄𝐑𝐆𝐘 (PE)

Gravitational PE:
PE = mgh

Where:

• m = mass (kg)
• g = 9.8 m/s² (or 10 m/s²)
• h = height (m)

Elastic PE (Spring):
PE = ½kx²

Where:

• k = spring constant (N/m)
• x = displacement from equilibrium (m)

━━━━━━━━━━━

🔬 𝟒. 𝐖𝐎𝐑𝐊-𝐄𝐍𝐄𝐑𝐆𝐘 𝐓𝐇𝐄𝐎𝐑𝐄𝐌

Statement: Net work done on an object equals the change in its kinetic energy.

W(net) = ΔKE = KEf - KEi = ½mvf² - ½mvi²

━━━━━━━━━━━

🔬 𝟓. 𝐂𝐎𝐍𝐒𝐄𝐑𝐕𝐀𝐓𝐈𝐎𝐍 𝐎𝐅 𝐄𝐍𝐄𝐑𝐆𝐘

Statement: Energy cannot be created or destroyed, only transformed.

Etotal = KE + PE = constant (in isolated system)

For frictionless systems:
½mvi² + m g hi = ½mvf² + m g hf

━━━━━━━━━━

🔬 𝟔. 𝐏𝐎𝐖𝐄𝐑 (P)

Definition: Rate at which work is done or energy is transferred.

Formula: P = W/t = E/t = F × v

Where:

• W = work done (J)
• t = time taken (s)
• F = force (N)
• v = velocity (m/s)

Unit: Watt (W) = 1 J/s
Other: Horsepower (hp) ≈ 746 W

━━━━━━━━━━━━━

🔬 𝟕. 𝐄𝐅𝐅𝐈𝐂𝐈𝐄𝐍𝐂𝐘

Formula:
η = (Poutput / Pinput) × 100%
or
η = (Woutput / Winput) × 100%

Note: Efficiency is always less than 100% due to energy losses (friction, heat)

━━━━━━━━━━━━━

🔬 𝟖. 𝐅𝐎𝐑𝐌𝐔𝐋𝐀 𝐒𝐔𝐌𝐌𝐀𝐑𝐘

| Quantity | Formula | Unit |
| ---------------- | --------------------- | ---- |
| Work | W = Fd cos θ | J |
| Kinetic Energy | KE = ½mv² | J |
| Gravitational PE | PE = mgh | J |
| Elastic PE | PE = ½kx² | J |
| Power | P = W/t = Fv | W |
| Efficiency | η = (Pout/Pin) × 100% | % |

━━━━━━━━━━━━━━

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