Physics obj

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11CCCDADCABA
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Physics answers now posted

: 8ai)
Force is a push or pull which changes a body state of rest or of uniform motion in a straight line
8aii)
The two types of force are
*constant force
*field force
*magnetic force
*gravitational force
=====
5)
i)availability of constant sunlight
ii)nearness to power grid
iii)must be closer to both skilled and unskilled labour
[10:06AM, 9/14/2017] Waka Gist Admin: *Question one*
(a)  Horizontal speed just before it strikes floor = ucos(theta)
                                                                                    = 10cos0°
                                                                                    = 10 m/s

(b) t = √(2g/h)
        = √(2*10*1)
        = √20
        = 4.47s

Question 4
(a)  given: u = 20m/s
                   t = 4s
                   g = 10m/s²
                   h = ?
    Using s = ut - ½gt²
               s = 20(4) - ½(10)(4)²
               s = 0m

(b)   The inference is that after 4s, the ball returns back to the plane of projection

Question 3
Magnetic materials: ¶ Iron ¶ Cobalt ¶ Nickel

Question 2
¶ medical uses
¶ welding and cutting
¶ military uses for defense and counter measures

Question 5
The factors that determine the location of a solar power station are
¶ Intensity of sun light
¶ surface slope
¶ feeder capacity of the distribution center

Question 11
(a)  ¶ Electrical method
       ¶ Contact method

(b)  Electric lines of force are imaginary lines drawn in an electric field in such a way that the direction at any point gives the direction of the electric field at such a point

(c)  QR = SP

(d)  Resistivity is the resistance of a unit length of material of unit cross-sectional area

(e)  Given: F = 50Hz
                   L = 10 mH (10×10^-³H)
       Inductive reactance, XL = 2πFL
                                                  = 2×3.14×50×10×10^-³
                                                  = 3..14 ohms

(f)  If voltmeter reads 12V, over the 500 ohms, then using I = V/R
                                                            current in the circuit is I = 12/500
                                                                                                     I = 0.024A
     Hence over the 200 ohms, V = IR
                                                    V = 0.024×200
                                                    V = 4.8 VOLTS
     Voltmeter will read 4.8 volts

*Question 9*
(a) Poor conductors of heat application: ¶ Coat (Trapped air in between the fabric)
                                                                        ¶ The hair and the fur of animals are bad conductors of
                                                                            heat and they protect them from cold .

(b) Renewable: Water, corn stalk
     Non-renewable: coal, natural gasgas

(c) A closed is a physical system so far removed from other systems that it does not interact with them.

d)  heat required to melt = mc∆ + ml
    *NB*: Not sure of the temperature given, if it is -3°C or -5°C, However, *Using -3°C*
Heat = (0.1×2200×3)+(0.1×2.26×10^6)
           = 226660 J

e) (i) Given:  75 heart beats in 1 min
                      Therefore in 1 hour, we have (75×60) heart beats = 4500 heart beats
         Also given:  2J of energy is expended in 1 heart beat
                       Therefore for 4500 heart beats, energy expended = (4500×2) J = 9000J

e) (ii)  Energy = mc∆
           9000 = (0.25×4200×∆)
           9000 = 1050∆
           ∆ = 9000/1050
           Temperature rise = 8.57°C

Question 8

a)(i) A force is anything that causes motion
(ii) ¶ contact force
      ¶ field force

b)(i)  Bodies are streamlined so they can overcome to a great extent the viscosity that exists in fluids
   (ii) ¶ submarines
         ¶ seals

8c
i) ¶ Fg is downwards
    ¶ T1 is upwards

ii) ¶ a = v²/r
       a = 7²/1.2
       a = 40.8 m/s²

    ¶ F = ma
          = 1.3 × 40.8
          = 53N: SECTION-A ANS 5 ONLY
================================
4a)
Time (t)=4secs
V=0ms^-1
pie call,V^2=U^2+2gh
O^2=20^2+2(-10)h
0=400-20h
20h/20=400/20
h=20m
4b)
the magnitude of the initial speed (u) is equal to the magnitude of the height attained
================================

================================
2)
i)used ineye surgery
ii)used for the precise cutting of flat material
iii)used for measuring distances
================================
3)
i)iron
ii)steel
iii)nickel
================================
5)
i)availability of constant sunlight
ii)nearness to power grid
iii)must be closer to both skilled and unskilled labour
================================
Keep Refreshing
Typing/Solving
: (6)
P-type semi conductors are created by dopung an intrisic semi conductor with acceptor impurities.
================
: 1.
(a) Horizontal speed just before it strikes floor = ucos(theta)
= 10cos0°
= 10 m/s

(b) t = √(2g/h)
= √(2*10*1)
= √20
= 4.47s
=============================

2
- medical uses
- welding and cutting
- military uses for defense and counter measures
================================

3.
Magnetic materials:
- Iron
- Cobalt
- Nickel
===============================

4.
(a) given: u = 20m/s
t = 4s
g = 10m/s²
h = ?
Using s = ut - ½gt²
s = 20(4) - ½(10)(4)²
s = 0m

(b) The inference is that after 4s, the ball returns back to the plane of projection
===============================

5.
The factors that determine the location of a solar power station are
- Intensity of sun light
- surface slope
- feeder capacity of the distribution center
===============================

8a)
i. Force is a push or pull which changes a body's state of rest or uniform motion in a straight line.

ii.
a) field force
b) contact force

8b)
i. Bodies streamlined in
Shape move through fluid so as to oppose or overcome the motion of the fluid

ii.
a) fish
b) submarine

8c)
Mass= 1.3 kg
F= 1.2 m
V= 7.0 m/s

Drawing

ii. Acceleration
Note , V²= U² + 2as

Where S=r=1.2 m

(7.0)²= 0²+2× a (1.2)

= 49/2.4 = 2.4a/2.4

a = 20.4

B) Force=?
From force = MA
Force =1.3×20.4
Force =25.52
===============================

9)
(a) Poor conductors of heat application: - Coat (Trapped air in between the fabric)
- The hair and the fur of animals are bad conductors for heat and they protect them from cold .

(b)
Renewable: Water, corn stalk
Non-renewable: coal, natural gas

(c) A closed is a physical system so far removed from other systems that it does not interact with them.

d) heat required to melt = mc∆ + ml
Note: Not sure of the temperature given, if it is -3°C or -5°C, However,
Using -3°C
Heat = (0.1×2200×3)+(0.1×2.26×10^6)
= 226660 J

e)
i. Given: 75 heart beats in 1 min
Therefore in 1 hour, we have (75×60) heart beats = 4500 heart beats
Also given: 2J of energy is expended in 1 heart beat
Therefore for 4500 heart beats, energy expended = (4500×2) J = 9000J

ii. Energy = mc∆
9000 = (0.25×4200×∆)
9000 = 1050∆
∆ = 9000/1050
Temperature rise = 8.57°C
================================
11)

(a)

- Electrical method
- Contact method

(b) Electric lines of force are imaginary lines drawn in an electric field in such a way that the direction at any point gives the direction of the electric field at such a point

(c) QR = SP

(d) Resistivity is the resistance of a unit length of material of unit cross-sectional area

d) heat required to melt = mc∆ + ml
Note: Not sure of the temperature given, if it is -3°C or -5°C, However, *Using -3°C*
Heat = (0.1×2200×3)+(0.1×2.26×10^6)
= 226660 J

(e) Given: F = 50Hz
L = 10 mH (10×10^-³H)
Inductive reactance, XL = 2πFL
= 2×3.14×50×10×10^-³
= 3..14 ohms

(f) If voltmeter reads 12V, over the 500 ohms, then using I = V/R
current in the circuit is I = 12/500
I = 0.024A
Hence over the 200 ohms, V = IR
V = 0.024×200
V = 4.8 VOLTS
Voltmeter will read 4.8 volts

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Uniport cancles post utme date

This to inform all prospective Students of University of Port-

harcourt (UNIPORT) that owing to unforeseen circumstances,

that the 2017/2018 Screening Exercise scheduled to

commence on the 14th September, 2017, has been postponed.

A new date will be communicated in due course.

Candidates are therefore advised to visit the University

website for further information in this regard. Registration for

the Screening is still on going.

Any inconvenience caused by this postponement is regretted.

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NEWS SOLDIERS ARRIVE NNAMDI KANU HOUSE

• Eyewitness alleges 15 died
• Trucks burnt in IPOB, army clash
• Ikpeazu declares curfew in Aba
• Troops attack NUJ office, journalists
• Ohanaeze asks FG to stop military operation, says it escalates crisis

There was tension in Abia State yesterday as soldiers laid siege to the Afaraukwu country home of the leader of the Indigenous People of Biafra (IPOB), Nnamdi Kanu, and clashed with members of his group leading to the alleged death of 15 persons.

It was learnt that the soldiers arrived in the community yesterday barely 48 hours after the clash between them and IPOB members on Sunday evening.

The return of the soldiers with about 10 armoured personnel carriers (APCs) and seven Hilux vans caused panic in the area, forcing shop owners to close immediately. Some of the soldiers also invaded the Abia State Council of the Nigeria Union of Journalists on Aba Road, Umuahia, and destroyed laptops and other valuables. According to journalists at the secretariat, the soldiers claimed they saw somebody taking photographs of them from the building.

The Chairman of Council, Mr. John Emejor, who confirmed the incident, said a national officer of the union, Ezeogo Bonny Okoro was slapped by one of the soldiers.

“Our stand is that those involved in this attack on innocent journalists should be fished out and punished in line with the constitution of the country,” he said.

The Assistant Director, Army Public Relations, 14 Brigade, Major Oyegoke Gbadamosi, confirmed the incident and asked Emejor to send the photograph of the damaged office to him.

Yesterday, truckloads of IPOB members headed for Afaraukwu apparently to show solidarity to Kanu. Some members of the group moving into Umuahia were allegedly confronted at Isiala-Ngwa junction yesterday afternoon by soldiers. Some of the trucks conveying IPOB members waving the Biafra flags were seen on the dilapidated Enugu-Port Harcourt highway yesterday evening on their way to Abia State.

What started like a drama of sort at the Isialangwa junction in Abia later snowballed into a major crisis that claimed lives and injuries. The Guardian learnt that at least 10 trucks were burnt with over 15 dead bodies lying on the Aba-Port Harcourt highway yesterday evening.

It was learnt that the majority of those who died were either felled by bullets allegedly fired by soldiers or hit by other objects while trying to escape.

A source disclosed how the trouble began: “On getting to Isiala Ngwa junction after Aba, they encountered an army check point which refused to allow them continue in their movement. This sparked off a quarrel as many other truckloads joined them. During the ensuing confrontation, bullets began to go up, especially when the IPOB members attempted to force their way to Umuahia.

“At the checkpoint so many people were injured, some received head cuts, some were arrested and there were some who also lost their lives.”

Information about the incident which spread to Aba, Obigbo, Port Harcourt in River State had infuriated members of the IPOB who poured into the streets and started destroying things and attacking security agents, including policemen on duty.

A source said he was searched at many locations between Bayelsa and Aba. “I saw dead bodies on the way and I thank God I did not run into the crisis. I saw bonfires made here and there and trailers that were set on fire.”

A source also said that most places in Obigbo in Rivers State were vacated after soldiers stormed the area in search of IPOB boys who blocked major roads in protest against the killing of their members at the Isiala Ngwa junction.

A meeting scheduled to hold on Friday by governors of the south-east zone to discuss issues relating to the Biafra agitation may no longer hold as Kanu has opted out. It was learnt that Ebonyi State Governor and Chairman of South-east Governors’ Forum, Dave Umahi, had called the meeting as a follow-up to the one held in Enugu on August 30.

The earlier meeting attended by the sou

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Biology answers now posted

BIOLOGY OBJ✔✔✔
1-10 BAABDDACBB
11-20 ABAAACBDCB
21-30 CBCABCBBAA
31-40 ACAACACACC
41-50 CCBADBBDAA
++++++++++++++++++++++++++
KEEP REFRESHING THIS PAGE
++++++++++++++++++++++++++

AS WE AWAIT AUTHENTICATION

(1ai)
-white blood cells
-lipids

(1aii)
-Responsible for the removal of interstitial fluid from tissues
-It transports white blood cells to and from the lymph nodes into the bones

(1bi)
-oxygen
-excretory products, such as carbon dioxide, urea, etc
-Hormones

(1bii)
Plants absorb water from the soil through their root hairs which are surrounded by soil water in the soil. The soil water is a more dilute solution than the soil sap inside the root hair hence water molecules move from soil water into the root hairs by the process of osmosis. Mineral salts are absorbed through the cell membrane often from a zone of their low concentration in the soil to a zone of their higher concentration in the cells of the roots through active absorption.

(1ci)
Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a placenta.

(1cii)
-Marginal placentation
-Parietal placentation
-Axile placentation
-Free central placentation

=========================================

(3ai)
Community is any naturally Occurring group of different organisms living together and interacting in the same environment.

(3aii)
Population is defined as the total number of organisms of the same species living together in a given area

(3aiii)
Ecologicalnide refers to the specific portion of a habit which is occupied by a particular organism

(3b)
Because all living organism need energy and nutrient in an environment in other to sustrundipe

(3ci)
-Lack of enough food
-out break of disease
-lack of money

(3cii)
-Exposed the soil into erosion
-Cause loss of nutrient into the plant
-Cause low yield

=================================================

(6bi)
Irritability is the ability to be excited to a characteristic action or function by the application of some stimulus

(6bii)
-Water
-Light

(6ci)
Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking

(6cii)
-it Destroy soil living organism
-it reduces soil fertility
-it causes soil erosion

(6d)
Territoriality: this is the process in which male agama lizard prevent other males frm entering into it niche containing few female lizard, colour display: male agama lizard may bask in d sun so dat it reddish head will become more brigther in order to attract potential female lizard

(6ei)
Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.

(6eii)
Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through a placenta or similar structure.

(6f)
Rhizobium turns the free Nitrogen in air into
-Ammonia
-Nitrate

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Maths real expo

3)
2x/1 – 2/5 y = 2y/1
LCM = 5‎
10x – 2y = 10y
10x = 10y + 2y
10x = 12y
X = 12y/10 ————-1
2x – 2/5y + 2 1/4x + 1/2y + 2y = 180
LCM = 20
40x – 8y + 45x + 10y + 40y = 3600
40x + 45x + 10y – 8y + 50y = 3600
95x + 42y = 3600
95 (6y/5) + 42y =3600
19(6y) + 42y = 3600
114y + 42y = 3600
156y = 3600
Y = 3600/156
Y = 23.08
Sub for y in eq 1
X = 6(23.08)/5
X = 27.69‎
ANSWER LOADING

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Agric essay now posted

Keep refreshing and sharmplete Agriculture Science

1a.)

I) unpredictable climate

1. Droughts or prolong periods without rain results in poor yields

2. Flooding results in erosion 

3. Inadequate sunshine also reduces photosynthetic ability of plants

ii) inadequate rural infrastructure

1. This results in urban drift ie massive exodus to big cities for better standard of living.

2. Results to massive reduction in agricultural work force in rural settings

3. Results in low agricultural production

iii) Diseases

1. Result in increase in agricultural cost of production

2. Reduce the quality of farm produce

3. Reduce farmers income

1bi)

1. Contour ditch 

2. Border dyke

3. Furrow irrigation 

4. Wild flooding

1bii)

1. High salt problems or salinity of soil which prevents proper growth of crops

2. Transmissions of diseases is possible

3. There is a build up and spread of pests

4. Pollution of the environment is possible

5. There is high cost of equipment

6. Vectors of diseases breed freely

=================================================

2ai)

Economic factors:

Most farmers are poor and cannot to bug machines such as tractors, plough,ridges, harrows,harvester.

2aii)

Technical know-how; most famers jack the required Knowledge and skills to operate sophisticated machines.

2aiii)

Small farm holdings; it is not economical for small scale farmers since it is very expensive to operate.

2b) Piercing and sucking crop pests;

These pests (mostly insects) have mouth parts that are modified and adapted for piercing and sucking plant tissues examples of them are aphid, moths,cotton ,stainer,cocoa thrip e.t.c

ii) Biting and chewing crop pests; These are mostly vertebrate and invertebrates pests that posses strong mouth parts for adapted to their mode of feeding examples are grasshoppers, crickets, termites, e.t.c

iii) Boring crop pests; These are insect pests whose mouth parts are adapted for boring holes and destroying tissues of seeds sem and fruits examples are weevils, stem borers and fruit fly and beetles

============================================

3ai)

i)Long lactation periods

ii)Immunity and resistence from diseases

iii)Healthy variety

iv)Long life

3aii)

i)Camels

ii)Horses

3aiii)

i)It can perform more tedious jobs than man.

ii)It can handle many farm operations.

iii)It can be controlled or easy to operate.

iv)They are much stronger than man

3b) Symptoms of Bacterial blight of cottons

i)Angular Spots on leaves 

i) Death of shoots and rotting bolls

Control measure of Bacterial blight of cottons

i) Remove and burn infected plants 

ii) Grow resistant varieties 

Symptoms of Cassava Mosaic

i) Distortion of leaves 

ii) Leaf curl 

Control measures of Cassava Mosaic

i) Spray with insecticides 

ii) Uproot and burn infected plants

==============================================

4a)

i)Sunlight

ii)Temperature

iii)Rain

iv)Water or Humidity

v)Soil or water chemistry

vi) pollution

4b)

i)green plants make use of the food they manufacture to produce seed and fruits

ii)dead an decayed plants and animals provide food for the saprophytic organismm

iii)seed produced by plants is used to reproduce another plant

iv)animals make use of the carbonhydrate food produced by plants to get energy and fruit used as food

v)animals and plant produce carbonhydrate(Co2) during respiration to enrich the atmostphere with Co2

4c)

spacing 40cm*40cm

but 100cm=1m

40cm/100=0.4m

spacing=0.4m*0.4m

spacing=0.16m

4di)

i)Hemp

ii)Hoopvine

iii)Nettles

iv)Ramie

4dii)

i)Tea

ii)Mate

iii)Kola

iv)Kava kava.

================================================

5ai) -Beak/Mouth

-Esophagus

-Crop

-Proventriculus

-Small Intestine

5aii) -Beak/Mouth: The Beak/Mouth contains glands that secrete saliva, which wets the feed to make it easier to swallow. Also, the saliva contains enzymes, such as amylase, that start the digestion process.

-Esophagus: The esophagus is a flexible tube that connects the mouth with the rest of the digestive tract. It carries food from the mouth to the crop and from the crop to the proventriculus.

-Crop: The crop is an out-pocketing of the esophagus and is located just outside the body cavity in the neck region. Swallowed feed and water are stored in the crop until they are p

-Proventriculus: The esophagus continues past the crop, connecting the crop to the proventriculus. The proventriculus (also known as the true stomach) is the glandular stomach where digestion primarily begins.

-Small Intestine:The small intestine is made up of the duodenum (also referred to as the duodenal loop) and the lower small intestine. The remainder of the digestion occurs in the duodenum, and the released nutrients are absorbed mainly in the lower small intestine

5b)- Lack of proper education of farmers 

-Poverty does not allow people to join insurance 

-The difficulty of paying farmers when they are due

-Inattractiveness of insurance in west África 

-They seem to benefit only their stakeholders and not farmers

5c) -They are very expensive to operate

-They are only availiable to farmers who are Wealthy enough to own television and radio sets 

-Farmers may find it difficult to ask questions on matters which they do not understand 

-They are only useful to educated farmers;illiterate farmers can never benefit

===========================

Q6a. 1. Centro 2. Mucana 3. Stylo 4. Sun hemp

Q6b.

Q6c

Debit

Purchases and expenses (le)

Opening valuation- 15,000.00

Cost of agrochemicals- 3,800.00

Hiring of labour- 9,000.00

Transportation – 1,500.00

Cost of processing farm produce – 2,500.00

Miscellaneous – 2,000.00

Total- 33,800.00

Net profit- 40,200.00

Grand total – 74,000.00

Credit

Sales and receipts (le)

Closing valuation – 15,000.00

Sales of crops – 57,700.00

Crops consumed – 1,300.00

Total – 74,000.00

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