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COMPLETE : 2016 Neco Gce Physics (Essay And Obj) Expo Answers

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Complete Neco Gce Physics

5a)
boiling point of a liquid is d point at which d saturated vapour pressure is equal to atmospheric pressure.

5b)
quantity of heat 1^2 RT
given that
1=3A
R=12n
T=25*60=1500s
quantity of heat= 3^2*12*1500
=9*12*1500
=162000
==================================

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2a)
WEIGHT
i)Weight is a force with which gravity pulls on it
ii)The weight is a force a body exerts when it is in gravitational
MASS
i) mass is the actual amount of material contain in the body
ii)Mass of the body is the constant quantity and does not change with the change of position or location

12c)
the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act

12d)
f=60Hz, amplitude=6cm, d=4cm
i)velocity V=wr where r=d=4cm
=2^fr
=2*3.142*60*4/100
=15.08m/s

ii)acceleration,a =w^2r
=Vw
=2*3.1423*60*15.08
=5686.37m/s^2‪‬

12a)Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force

12b)i)it opposes motionii)the liniting frictional force is independent of thesurface area in contact

12c)the centre of gravity of a body isdefined as the partin which the resultant weight ofa body appears to act-from

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12d)f=60Hz, amplitude=6cm, d=4cmi)velocity V=wr where r=d=4cm=2^fr=2*3.142*60*4/100=15.08m/sii)acceleration,a=w^2r=Vw=2*3.1423*60*15.08=5686.37m/s^2

3a)
Amplitude can be defined as the maximum extent of a vibration or oscillation,measured from the position of equilibrium

(b)
Period is a length or a portion of Time

12a)
Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force

12b)
i)it opposes motion
ii)the liniting frictional force is independent of the surface area in contact

12c)
the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act

12d)
f=60Hz, amplitude=6cm, d=4cm
i)velocity V=wr where r=d=4cm
=2^fr
=2*3.142*60*4/100
=15.08m/s

ii)acceleration,a =w^2r
=Vw
=2*3.1423*60*15.08
=5686.37m/s^2

‪‬12a)
Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force

12b)
i)it opposes motion
ii)the liniting frictional force is independent of the surface area in contact

12c)
the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act

12d)
f=60Hz, amplitude=6cm, d=4cm
i)velocity V=wr where r=d=4cm
=2^fr
=2*3.142*60*4/100
=15.08m/s

ii)acceleration,a =w^2r
=Vw
=2*3.1423*60*15.08
=5686.37m/s^2

16a) radioactive element are used in agriculture as radioactive tracers and to induce mutations in plants and animals to obtain new and improved varieties.biologist used them as tracers or markers to help trace the paths of metabolic processes in plants and animals.geologist and archaeologist use the measurement of half-life to estimate the age of rocks and carbon-14(radiocarbon) to date recent organic remains. This is called radioactive dating

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16aii) radioactive elements are used in industry to study the defects in metals and welded joints,and to check metal fatigue, as radioisotopes,they are used to trace underground pipe leakages

‪‬13ai)
wheel-barrow is termed second class lever because its load is between the fulerum and the effort

13aii)
TABULATE
FIXED PULLY
i)it consist of a wheel and a shaft and is used in conjuction with a belt to transfer energy to another fixed pully
ii)the input force and output force are equal
MOVABLE PULLY
i)it consist of a shell,a movable wheel and a rope
ii)the input and output put forces are not equal

13bi)
-fahrenheit scale
-kelvin scale

13bii)
-fahrenheit scale -32degre^f-212degree^f
-kelvin scale -273k-373k

13c)
given that mass of copper ball=30g=0.03kg
temperature of copper ball=180degree census
mass of caloritueter=80g=0.08kg

‪‬3a)
Amplitude can be defined as the maximum extent of a vibration or oscillation,measured from the position of equilibrium

(b)
Period is a length or a portion of time

‪‬16b)
ii..Radioactivity emit some extra
ordinary types of rays(alpha, beta and
gomma) which are helpful in human
beings in minutes quantity
============

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