WAEC Physics obj Objective Essay 2021 Questions, Answers
WAEC Physics questions and answers
Original length Lo= 3m
Extension e = 310 = 3*3= 9m
F=ke where k = 982.3NM-²
The five that produce the extension F = 8.840.7N
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.
Thermal insulator is used for reduction of heat transfer between objects in thermal contact
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
highly purified silica glass.
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.
Escape velocity = VE
Radius of the earth = R
Acceleration due to gravity = 10ms²
Escape velocity Be=√2R
Angle at horizontal θ = 30°
Time of light , T = 25sec
Velocity of projection u = ?
But T=2using sinθ/g
A torque is defined as a measure of the force that can cause an object to rotate about an axis
WAEC Physics Questions 2021 and Answers
Factors that determine torque are;
– The magnitude of the force
– The radius
– The angle between the force and the lever arm
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s
Using the relation
S= ut + 1/2gt^2
H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2
= t^2 + 2t – 8=0 ( solving quadratically)
t+4=0 or t-2=0
t= -4 or t=2
Therefore time to fall on the ground t=2s
R.d of oil =R1 = 0.72
R.d of water = R2=1.00
R.d of liquid= R1/R2= 0.72/1 = 0.72
R.d = density of wood(P1)/density of water(P2)
But density of wood= mass of wood/volume of wood
0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g
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