The potential energy in an elastic string of force constant K which has been extended by X metres is expresses as
A\(\frac{1}{2}k \Box ^2\)
B\(k \Box ^2\)
C\(\frac{1}{2}k \Box \)
D\(k \Box \)
View Explanation & Discuss
Question 482
waec2006
Which of the following statements about the mouth piece of a telephone is correct? It converts sound energy into
Aacoustic energy
Bmechanival energy
Celectrical energy
Dheat energy
View Explanation & Discuss
Question 483
waec2006
A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms-1, calculate the initial kinetic energy of the stone
A200J
B400J
C800J
D1600J
View Explanation & Discuss
Question 484
waec2006
Which of the following source of energy is renewable?
Apetroleum
Bcharcoal
Chydro
Dnuclear
View Explanation & Discuss
Question 485
waec2006
A force acting on a body causes a change in the momentum of a body from 12 kg ms-1 to 16kg ms-1 in 0.25. Calculate the magnitude of the impulse
A28.0Ns
B20.0Ns
C4.0Ns
D0.8Ns
View Explanation & Discuss
Question 486
waec2006
which of the following statements about simple harmonic motion is correct? The
Atotal mechanical energy is always conserved
Blinear acceleration is directed to any variable point
Clinear acceleration varies inversely with displacement
Dperiod of oscillation varies linearly as acceleration due to gravity
View Explanation & Discuss
Question 487
waec2006
Which of the following quantities is a vector?
Aspeed
Bdistance
Cenergy
Dmomentum
View Explanation & Discuss
Question 488
waec2006
A car accelerates uniformly from rest at 5 ms-2. Determine its speed after 10s
A50.0ms-1
B25.0ms-1
C2.0ms-1
D0.5ms-1
View Explanation & Discuss
Question 489
waec2006
Uniform speed occurs when there is equal change of
Adistance in equal times
Bdisplacement in equal times
Cvelocity in equal times
Dacceleration in equal times
View Explanation & Discuss
Question 490
waec2006
A moving car of mass 800 kg experiences a frictional force of 200N. If it accelerates 2 ms-2, calculate the magnitude of the force applied to the car
A600N
B1000N
C1600N
D1800N
View Explanation & Discuss
Question 491
waec2006
A body is rotating in a horizontal circle of radius 2.5m with an angular speed of 5 rad s-1. Calculate the magnitude of the radial acceleration of the body
A62.50ms-2
B31.25ms-2
C12.50ms-2
D10.00ms-2
View Explanation & Discuss
Question 492
waec2006
An object is said to undergo oscillatory motion when it moves
Ain an erratic manner
Bto and fro about a fixed point
Cin a circular path
Dalong a continuous path from the starting point
View Explanation & Discuss
Question 493
waec2006
A solid body will float in a liquid if its
Adensity is less than that of a liquid
Bmass is equal to that of the liquid
Cdensity is greater than that of the liquid
Dmass is less than that of the liquid
View Explanation & Discuss
Question 494
waec2006
A block of volume 3 x 105m3 and density 2.5 x 103 kg m-3 is suspended from a spring balance with \(\frac{2}{3}\) of its volume immersed in a liquid of density 900 kg m-3. Determine the reading of the spring balance [g = 10ms-2]
A0.18N
B0.57N
C0.75n
D0.93N
View Explanation & Discuss
Question 495
waec2006
Which of the following physical quantities are derived? i. Area ii. Thrust iii. Pressure iv. Mass
Ai, ii, iii and iv
Bi, ii and iii only
Ci, ii and iv only
Di and iii only
View Explanation & Discuss
Question 496
waec2006
Which of the following phenomena causes capillary of liquids in tubes of narrow bore?
Aviscosity
Bsurface tension
Cosmosis
Dbrownian motion
View Explanation & Discuss
Question 497
waec2005
Uranium of atom number 92 and mass number 238 emits an alpha particle from its nucleus. The new nucleus formed has respectively, atomic number and mass number
A94 and 238
B90 and 236
C88 and 234
D90 and 234
View Explanation & Discuss
Question 498
waec2005
The mass of a proton is 1.0089\(\mu\) and that of a neutron is 1.0089\(\mu\). Determine the energy evolved in stabilizing the nucleus of nitrogen of mass number 14 with 7 protons and 7 neutrons. [speed of light = 3.0 x 108ms-1; 1\(\mu\) = 1.67 x 10-27kg]
A1.710 x 10-8J
B3.131 x 10-8J
C1.476 x 10-8J
D2.332 x 10-9J
View Explanation & Discuss
Question 499
waec2005
Light of energy 5.0 eV falls on a metal of work function 3.0 eV and electrons are emitted, determine the stopping potential. [electronic charge, e = 1.60 x 108ms-19]
A1.7V
B2.0V
C8.0V
D15.0V
View Explanation & Discuss
Question 500
waec2005
A process by which two light atoms join to form a new atom of higher atomic mass is
