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Solution Centre for All Examinations both WAEC/WASSCE/SSCE, NECO, NABTEB, JAMB (UTME), Post-UTME, WAEC GCE, NECO GCE, NABTEB GCE etc

Physics OBJ

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1a)

Young modulus of a material or the modulus of elasticity.

1b)

Potential Energy to Kinetic Energy.

From potential to kinetic energy

2)

e = 0.7m

m=60 × 10^-3kg = 6.0×10^-2kg

K = 200Nm^-1

W = 1/2ke² = 1/2mv²

1/2ke² = 1/2mv²

V² = ke²/m = 200×0.7²/6.0×10^-2

V² = 98×10²/6

V² = 16.33×10²

V = √1633

V = 40.4

Speed = 40.4ms^-1

3)

i)resistance to electromagnetic interference

ii)longer transmission distance

iii)Extremely highly bandwidth

4a)

It is used in geometric stations used to move a satellite from low earth orbit into a geostationary orbit.

4b)

Polar orbit satellite is used in earth mapping.

5a)

i) Centripetal force

ii) Centrifugal force

5b)

Ft = mDv

where F = force

t = time

Dv = change in velocity

m = mass of object

Hence F = mDv/t

6a)

i) It can cause short and long term sun burn effects.

ii)It can cause blindness when flashed to the eyes.

6b) Energy = hf

= 6.60×10^-34 × 4.82×10^14

= 3.18×10^-19J

= 1.99ev

7)

V = 2πR/T

R = 9.6×10^6 + 6.4×10^6 =16×10^6 m

T = 24hrs =(24×60×60)s

V = 2×3.142×16×10^6/24×60×60

V = 1162.96m/s

8a) Mass is the amount of material contained in a body and the SI unit is Kg while Weight is the force exerted on a body by the gravity of the object. ..Mass is a scalar quantity( It has no specific direction), While Force is a vector quantity (It’s in the same direction with gravity)

8ai)

Mass is measured in Kg

Weight is measured in Newton

Mass is a scalar quantity

Weight is a vector quantity

Mass is constant

Weight varies

8aii) Clockwise moment about the pivot.

Moment = Force x Distance

Moment = 250 x 0.75

Moment = 187.5Nm

11a)

Lenz’s law states that an induced current is in such direction that it’s magnetic effect opposes the change by which the current is induced.

11b)

i) Magnets are used in the construction of speakers.

ii) They are used to store data in computers.

iii) Used in magnetic resonance imaging machines.

11ci)

a) Two coils: So as to produce an induced current from one coil to the other.

b) an iron core: To increase the strength of the magnetic field.

11cii)

Efficiency =outputs/input *100%

if efficiency =100%

Output power =input power

IsVs=IpVp

Is*110=5*220

Is=5*220/110=5*2=10A

Output current Is =10A

11d)

Total resistance in series

Rt = R1 + R2

= 500 + 400

Rt = 900ohms

Taking E = 6v

E = V + ir

E = VR + Ir

E = I ( R + r)

I = E/R + r

taking r = 200ohms

I = 6/900+200

I = 6/1100

I = 0.005A

Hence the voltmeter reading

V = IR

= 0.005 × 200

= 1.09v

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