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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

10 Jan, 07:11

phys remedial (2)-1.pdf

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PHYSICS REMEDIAL MODULE
( NATURAL STUDENTS )

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

9 Jan, 13:13

Important Algebraic Formulas

(a+b)²= a² + b² + 2ab

(ab)²= a² + b²-2ab

a²-b²= (a+b)(a-b)

a²+b²= (a+b)²-2ab or a²+b²= (ab)²+2ab

a³+b³ = (a + b)(a²-ab+b²) = (a+b)³-3ab(a+b)

a³-b³ = (a - b)(a²+ab+b²) = (ab)³+3ab(a - b)

2(a²+b²) = (a+b)²+ (ab)²

(a+b)²(ab)² = 4ab

a³+b³ = (a + b)(ab)[(a+b)²-2ab]

(ab)²= (a+b)² - 4ab

(a+b)²= (ab)² + 4ab

a² + b² = [(a+b)²-2ab]2-2(ab)²

(a+b+c)² = a²+b²+c²+2ab+2bc + 2ca

(a+bc)² = a²+b²+c² + 2ab - 2bc-2ca

(a-b-c)²= a²+b²+c²-2ab + 2bc-2ca

a³+b³+c³-3abc = (a+b+c)(a²+b²+c²-ab-bc-ca)

a² + a²b²+b²= (a²+ab+b²) (a² - ab + b²

a² + a² + 1 = (a²+a+1)(a²-a+1)

if a+b+c=0 then a³+b³+c³ = 3abc

a³-b³ = (a+b)(a²+b²)(a+b)(a-b)

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

🌟Promotion ለምትፈልጉ .... 👉 @Studyhardadmin https://youtube.com/@Etechtalk?sub_confirmation=1 Please subscribe our YouTube channel👆 -short note -EUEE -TEXT BOOK -GUIDE BOOK -INFORMATION -EDUCATIONAL VIDEO -QUIZ

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

9 Jan, 07:36

Репост из: 𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

QUICK REVISION⏰
FORMULAS

🎯1. Formulas related to force:
🗯️F = ma
🗯️F = kx
🗯️F = m(vf² - vi²/2S)
🗯️F = mv/t
🗯️F = md/t²
🗯️F = m(vf - vi)/t
🗯️F = Area × density × velocity²
🗯️F = 1/2 mv²/d
🗯️F = 1/2 Pv/d
🗯️F = Power/velocity
🗯️Fc = mv²/r
🗯️Fc = mrw²
🗯️Fc/2 = mv²/2r
🗯️Fc = 2K.E/r
🗯️F = Area × Stress
🗯️F = pir² × stress
🗯️F = YA × Strain
🗯️F = YAl/L
🗯️F = pressure × area
🗯️F = change in momentum × time interval
🗯️F = - 2mVx × Vx/2l
🗯️F2 = F1/A1 × A2
🗯️F = qE
🗯️F = kQ/r²
🗯️F = ILB sintheta
🗯️F = q (v × B)
🗯️F = qE + q(v × B)

🎯2. Formulas related to energy and work
👉Fd = k.e
👉mgh = 1/2 mv²
👉E = 1/2 kx²
👉E = Ve
👉E = nhf
👉E = nhc/lambda
👉E = Pc
👉K.e = hf - work function = hf - hf° = hf - hc/w° (here w° is cutt off wavelength)
👉E = 1/2 Pv
👉mv²/2r= Fc/2
👉K.E/r = Fc/2
👉K.E = Fc×/r/2
👉K.e = 1.5 KT
👉E = VQ
👉E = Power × time
👉E = Fvt
👉% loss in K.e = v1² - v2²/v1² × 100
👉% loss in P.e = h1² - h²/h1² × 100
👉Energy lost due to air friction(Fh) = 1/2mv² - mgh (when body is thrown upward)
👉Energy lost due to air friction(FS) = mgh - 1/2mv² (when body is thrown downward)
👉E = 1/2 CV² (capacitor)
👉E = R × hc (R is Rydberg' constant)
J = m-¹ × Js ms-¹
👉hf kalpha x rays = EL - Ek
hf kbeta x rays = EM - Ek
👉Binding energy = mass defect × c²
👉W = Fd Costheta
👉W = nmgh (when person is climbing stairs)
👉W = n(m+m) gh (when person is climbing stairs with some load)
👉W = 0mgh + 1mgh + 2mgh + 3mgh ....... (in case of stacking bricks. For ist brick h=0. For 2nd brick h=1. For 3rd brick h=2 and so on)
👉W = Fd = PA × change in V
👉W = Q - change in U
👉Q = mc × change in T
T/273.16 = Q/Q3 (Thermodynamic scale)
👉W = I²Rt
👉W = emf×charge
👉W = VQ
👉W = 1/2 lF
👉W = YAl²/2L
👉W = StressAl²/2Strain
👉W = PressureAl²/2Strain
👉W = Fl²/2Strain

🎯3. Formulas related to Power
💥P = Fv
💥P = E/t
💥P = n(mgh/t)
💥P = Fd/t
💥P = mv²/2t

🎯4. Formulas related to distance, displacement, velocity and accelration
📝d = vt
📝d = at²
📝d = (vf + vi/2) ×t
📝d = 5t² (for distance in 'n' seconds)
📝d = 5(2tn - 1) (for distance in 'nth' second)
📝d = 1/2 mv²/F
📝d = vit + 5t²
📝d = v × underroot 2H/g
📝d = vt = x°wt = x°2pi/T × t = x°2pift
📝x = x° Sin wt
📝x = x° Sin (underroot k/m) t
vf = vi + at
📝2as = vf² - vi²
📝2as = (vi + at)² - vi²
📝2as = vf² - (vf - at) ²
📝v = underroot Vfx² + Vfy²
📝v = Power/Force
📝v = 2×K.E/momentum (k.e = 1/2 Pv)
📝v² = 2×Power×time/mass (P = mv²/2t)
v = underroot 2as
v = underroot gr (speed at highest point in a verticle circle)
v = underroot 5gr (speed at lowest point in a verticle circle)
📝v² = 2FS/m
📝v² = 2E/m
📝v² = 2Ve/m
📝v = eBr/m (velocity of particle under action of magnetic force along circular path)
📝v² = Force/Area.Density
📝v = w underroot x°² - x²
📝v = underroot k/m × underroot x°² - x²
📝v = x°w (at mean position where x=0)
📝v = x° underoot k/m
📝v = v° underroot 1 - x²/x°² (for determining ratio b/w inst. Velocity and maxi. Velocity)
📝v= x°2pif = x°2pi/T
📝a = x°w² = x°w.w = vw = v.2pif
Common velocity = m1v1/m1+m2
📝vi² = Rg/Sin2theta
📝v = underoot Tension×length/mass
📝V = 2pi ke²/nh (speed of e- in nth orbit)
📝Vn = V/n
📝v = nh/2pimr (lambda = 2pir and lambda=h/p)
📝ma = kx
📝a = kx/m (SHM)
📝a = - gx/l (Simple pendulum)
📝ac = v²/r

🎯5. Formulas related to wavelength 'w'
💭w = v/f
💭w = 1/wave number
💭w1 = 2l (when pipe is opened at both ends)
💭w1 = 4l (when pipe is opened at one end)
💭Delta w = Us/f (doppler shift)
Wavelength for obs. = w - delta w = v/f - Us/f
💭w = hc/Ve
💭w = hc/E
💭w = h/mv
💭w = h/P as P = underroot 2mE so
💭w = h/underroot 2mE (de Broglie wavelength)
💭w = underroot 150/V A° (short method for de Broglie wavelength. This formula is applicable only for e-)
💭1/w = RH (1/p²-1/n²)
💭Wmaxi/Wmini = n²/n²-p² (for determining ratio b/w maxi. Wavelength to mini. Wavelength for series of atomic spectrum)
💭w = 2pir/n (n is no. of loops in a circle)
💭h/mv = 2pir

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

8 Jan, 08:45

G-12-Physics-Ch-04-Worksheet

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

5 Jan, 12:11

ማስታወቂያ

1 - የ 1 2ኛ ክፍል ሀገር አቀፍ ፈተና ምዝገባ ጥር 6 /2017 ዓ/ም ከቀኑ 10፡00 ሰዓት ላይ የሚጠናቀቅ ይሆናል። ስለሆነም ምዝገባ ያላጠናቀቃችሁ ከቀነ ገደቡ አስቀድማችሁ እንዲታጠናቅቁ እናሳስባለን።

2- የ2017 የትምህርት ዘመን ፈተናዎች ይዘት የሀገር አቀፍ 12ኛ ክፍል ፈተና በአጠቃላይ ሁኔታ ከ 9 - 12ኛ ክፍሎች እንዲሁም የ 8 ኛ ክፍል ክልላዊ ፈተና ከ7- 8ኛ ክፍሎች የሚሸፍን ይሆናል።

3- እያንዳንዱ ተማሪ በተማረበት የክፍል ደረጀ የተማረውን የተማሪ መጽሐፍን መሠረት አድርጐ ሊዘጋጅ ይገባል። ፈተናዎቹ ተማሪዎቹ የተማሩትን መሠረት አድርገው የሚዘጋጁ ይሆናል።

(የትምህርት ምዘናና ፈተናዎች አገልግሎት)

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

5 Jan, 07:03

🔰 Role of nutrients and their deficiency Symptoms 🔰

#Nitrogen

▪️Impart green colour to plant encourages vegetative growth

▪️ Nitrogen is essential constituent of protein

▪️ Constituent of Protoplasm of chlorophyll and coenzyme.

▪️ Play important role in
synthesis of auxin

#Deficiency

▪️ Lower leaves become yellow and dries.

▪️V shaped chlorosis on older leaves or yellowing at tip.

#Disease

▪️Starvation disease due to nitrogen deficiency.

▪️Buttoning in cauliflower.

#Phosphorous

▪️Increase the disease resistance.

▪️ Enhance new cell formation and necessary for root development.

▪️Required for grain formation and maturity of grains.

▪️Phosphorus is essential constituent for nucleic acid and phytin.

▪️Most essential functions are energy storage and transfer energy act as "energy currency".

#Deficiency

▪️Due to deficiency of single element the life cycle of plant can't be completed hence (Agricultureexamslibrary) Phosphorus is called " key of life "

▪️Deficiency imparts dark green colour in leaves.

▪️Later develops red purple colourration.

#Disease

▪️Sickle leaf diseases.

#Potassium

▪️Most essential function of K+ is stomata regulation.

▪️Provides disease resistance in plants.

▪️Cofactor for enzymes.

▪️Formation and translocation of Sugars.

▪️Helps in chlorophyll formation.

#Deficiency

▪️Spot of dead tissue at tips.

▪️Scorching and burning on margins of autumn leaves.

#Disease

▪️Rottle/ dieback disease.

#Calcium

▪️ It is constituent of cell wall

▪️ Calcium is a mobile in plants and deficiency symptoms appear on Meristem tip portion.

# Deficiency

▪️ Terminal bud die

#Disease

▪️Tip hooking.

▪️ Blossom end rot of tomato(BER).

▪️Popping in groundnut.

#Magnesium

▪️ Essential constituent of chlorophyll.

▪️ Magnesium is a constituent of chlorophyll.

▪️Chlorosis between veins.

#Disease

▪️Sand -drown disease of tobacco.

#Sulphur

▪️ Sulphur oxidizing Bacteria is Thiobacillus.

▪️Sulphur is essential for oil seed and pulses because it improves oil content and protein content in oil seeds and pulses, respectively.

#Disease

▪️Akiochi disease of rice due to Excess of hydrogen sulphide.

▪️Tea yellow disease of tea.

#Iron

▪️Fe is the component of nitrate reductase.

▪️Required for nitrogen fixation.

▪️During respiration act as O2 carrier.

#Deficiency

▪️Interveinal complete chlorosis.

▪️Scorching of leaf margin.

▪️Yellowing of iron chlorosis in groundnut.

#Manganese

▪️Formation of chlorophyll.

▪️Co-factor of enzyme.

▪️Mn toxicity causes crinckle leaf of cotton.

#Deficiency

▪️Dead spot on leaves.

#Desease

▪️Marsh spot of pea.

▪️Pahala blight of sugarcane.

#Copper

▪️Compound of plastocyanin.

▪Essential for photosynthesis/ respiration.Agriexams library

▪️Dieback and reclamation disease of cereals.

#Boron

▪ Necessary for Pollen germination.

▪️Boron is the only non-metal element among the micronutrient.

▪️It is necessary for translocation of Sugars and is involved in reproduction and germination of pollen.

#Disease : due to deficiency

▪️Browning of cauliflower is caused by Boron deficiency.

▪️Top sickness of tobacco.

▪️Fruit cracking of tomato.

▪️Hard fruit of citrus.

▪️Hen and chick disease of grape.

#Zinc

▪️In plants it is required for biosynthesis of hormones.

▪️Zn deficiency causes-

-White bud of maize.
-Khaira disease of rice.
-Little leaf of cotton.
-Mottled leaf of citrus.
-Rosette formation.

#Cobalt

▪️It is component of Vitamin B

▪️It is essential for formation of type of hemoglobin in N-fixing nodule tissue known as leghaemogloin.

▪️Act as O2 carrier in roots.

▪️Also known as animal protein factor.

#Molybdenum

▪️Mo: absorbed as molybdate MoO4-2 forms.

▪️Mo is important component of enzyme: Nitrate reductage.

▪️N-fixation in pulses.

▪️Whiptail of cauliflower is due to deficiency of Mo.

▪️Mo is required for carrot & raphanus for sweetness

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5 Jan, 02:04

What do you think about above picture
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3 Jan, 23:29

Guys It's useful for your👆 understanding of physics word problems

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31 Dec 2024, 12:54

2017 G-9 PHY SELF-TEST REVIEW QUESTIONS.pdf

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30 Dec 2024, 20:26

What is your current educational level?

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30 Dec 2024, 07:48

Hello students 👋
We need some one who want to be an Admin for this channel.

Eligibility: Grade 9-12 or University

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30 Dec 2024, 07:28

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23 Dec 2024, 19:08

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𝗦𝘁𝘂𝗱𝘆 𝗵𝗮𝗿𝗱 ©️

15 Dec 2024, 06:10

🛑14 Biology questions with Answer

1. Which process is primarily responsible for the production of ATP in cells?
   - A) Glycolysis
   - B) Photosynthesis
   - C) Cellular respiration
   - D) Fermentation
   - Answer: C)
2. Which of the following structures is found in plant cells but not in animal cells?
   - A) Mitochondria
   - B) Ribosomes
   - C) Cell wall
   - D) Nucleus
   - Answer: C) Cell wall
3. What is the primary function of the ribosome?
   - A) DNA replication
   - B) Protein synthesis
   - C) Lipid synthesis
   - D) Energy production
   - Answer: B) Protein synthesis
4. Which molecule carries genetic information from the nucleus to the cytoplasm?
   - A) DNA
   - B) mRNA
   - C) tRNA
   - D) rRNA
   - Answer: B) mRNA
5. Which phase of mitosis is characterized by the alignment of chromosomes in the center of the cell?
   - A) Prophase
   - B) Metaphase
   - C) Anaphase
   - D) Telophase
   - Answer: B) Metaphase
6. Which of the following is an example of a homozygous genotype?
   - A) Aa
   - B) BB
   - C) AB
   - D) Bb
   - Answer: B) BB
7. Which hormone regulates the levels of glucose in the blood?
   - A) Insulin
   - B) Thyroxine
   - C) Adrenaline
   - D) Estrogen
   - Answer: A) Insulin
8. Which of the following is not a component of the central nervous system?
   - A) Brain
   - B) Spinal cord
   - C) Peripheral nerves
   - D) All of the above are part of the central nervous system
   - Answer: C) Peripheral nerves
9. Which kingdom includes multicellular, photosynthetic organisms?
   - A) Fungi
   - B) Animalia
   - C) Plantae
   - D) Protista
   - Answer: C) Plantae
10. What is the basic unit of structure and function in living organisms?
    - A) Organ
    - B) Cell
    - C) Tissue
    - D) Organ system
    - Answer: B) Cell
11. What is the primary function of chlorophyll in photosynthesis?
    - A) Absorbing water
    - B) Absorbing sunlight
    - C) Producing oxygen
    - D) Producing glucose
    - Answer: B)
12. Which of the following best describes an ecosystem?
    - A) A group of the same species living in a specific area
    - B) A community of organisms and their physical environment interacting together
    - C) The variety of life within a specific habitat
    - D) A single organism and its role in the environment
    - Answer: B)
13. What is the primary role of mitochondria in cells?
    - A) Protein synthesis
    - B) Photosynthesis
    - C) ATP production
    - D) DNA replication
    - Answer: C) ATP production
14. Which type of macromolecule are enzymes?
    - A) Carbohydrates
    - B) Lipids
    - C) Proteins
    - D) Nucleic acids
    - Answer: C) Proteins

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21 Nov 2024, 16:20

ዛሬ ጠዋት በጅማ ዩኒቨርሲቲ የተማሪዎች ተቃውሞ መነሳቱ ተሰማ።

ተማሪዎቹ ይህንን የተቃውሞው ድምፅ ያሰሙት በህዝባችን ላይ ግድያ ይቁም በሚል ምክንያት ሲሆን ተማሪዎቹ ቁርሳቸውን ሳይበሉ ነው ወደ ተቃውሞ እንደወጡ ለማወቅ የተቻለው።

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