A body of mass 5kg movimg with a velocity of 30ms-1 due east is suddenly hit by another body and changes its velocity to 50ms-1 in the same direction. Calculate the magnitude of the impulse received.
A100Ns
B150Ns
C250Ns
D400Ns
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Question 412
waec2009
The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.
A26.7cm
B40.0cm
C160.0cm
D240.0cm
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Question 413
waec2009
Two forces 6N and 8N, act eastwards and northwards respectively on a body. Calculate the magnitude of their equilibrant
A2N
B7N
C10N
D14N
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Question 414
waec2009
The following properties of a solid are measured on earth i. weight ii. specific heat capacity iii. density. Which of the properties will hav a different value if measured in space?
Ai only
Bii only
Ciii only
Dii and iii only
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Question 415
waec2009
A moving body accelerates when it?
Achanges its direction at constant speed
Bmauntains a constant linear speed
Ccovers equal distances in equal times in a straight line
Dis acted upon by balanced forces
Enone of the above
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Question 416
waec2009
A body moving in a circle at constant speed has i. a velocity tangent to the circle ii. a constant kinetic energy iii. an acceleration directed towards the circumference of the circle. Which of the statements above are correct?
Ai and ii only
Bii and iii only
Ci and iii only
Di, ii and iii
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Question 417
waec2009
Which of the following types of types of motion will be produced when a pair of equal and opposite non-collinear parallel forces acts on a body?
Avibrational motion
Brandom motion
Ctranslational motion
Drotational motion
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Question 418
waec2009
A body of volume 0.046m3 is immersed in a liquid of density 980kgm-3 with \(\frac{3}{4}\) of its volume submerged. Calculate the upthrust on the body. [g = 10ms-2]
A11.27N
B33.81N
C112.70N
D338.10N
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Question 419
waec2009
In a hydraulic press, a force of 40N is applied to the smaller priston of area 10cm2. If the area of the larger piston is 200cm2, calculate the force obtained
A800N
B500N
C80N`
D50N
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Question 420
waec2009
Which of the following properties of a steel bar can be measured in terms of the dimension of length only?
Aweight
Bdensity
Cpressure
Dvolume
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Question 421
waec2009
In which of the following states of matter do the molecules vibrate about their mean positions?
Aliquids only
Bsolids only
Cliquids and gasses only
Dsolids, liquids and gases
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Question 422
waec2008
The diagram above shoes three forces F1, F2 and F3, which of the following ewuations is correct?
AF3 = F1 + F2
BF2 = F1 + F3
CF1 = F2 - F3
DF1 = F2 + F3
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Question 423
waec2008
A radioactive element has a decay constant of 0.077s-1. Calculate its half-life
A13.0s
B9.0s
C5.1s
D0.5s
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Question 424
waec2008
Control in nuclear reactors is effected with boron rods because rhe rods have the ability to
Aabsorb electrons
Babsorb neutron
Caccelerate electrons
Dslow down neutrons
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Question 425
waec2008
Nuclear fission is preffered to nuclear fusion in the generation of energy because
Avery high temperature are required for fusion
Bthe raw materials for fusion are easily obtained
Cenergy obtained from fusion is relatively small
Dthe by-products of fusion is very dangerous
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Question 426
waec2008
When a radioactive substance undergoes a beta decay, its
Amass number decreases by 1
Batomic number decreases by 1
Cmass number increases by 1
Datomic number increases by 1
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Question 427
waec2008
Both \(\gamma\)-rays and X-rays i. can be produced by thermionic emission ii. have low frequencies iii. have short wavelengths. Which of the statements above is/are correct?
Ai only
Bii only
Ciii only
Di and iii only
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Question 428
waec2008
A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor
A0.5J
B1.0J
C2.5J
D5.0J
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Question 429
waec2008
A transformer is required to supply 12 Vrms to operate a toy train set from a 240 Vrms. If the number of turns in the in the secondary coil is 100, calculate the number of turns required in the primary coil
