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8. (a) Simple harmonic motion is periodic because it repeats itself after a fixed time interval, known as the period, and the motion is governed by a restoring force that brings the system back to its equilibrium position.
(b) Two factors that affect the period of oscillation of a simple pendulum are:
– Length of the pendulum: The longer the pendulum, the longer the period of oscillation.
– Acceleration due to gravity: The higher the acceleration due to gravity, the shorter the period of oscillation.
9. (c) Two differences between absolute zero temperature and ice point are:
– Absolute zero temperature is the lowest possible temperature, at which all substances have zero thermal energy and all molecular motion ceases, while ice point is the temperature at which water freezes into ice at standard atmospheric pressure.
– Absolute zero temperature is an absolute scale with a fixed reference point, while ice point is a relative scale based on the freezing point of water.
11. The electric potential at a point in an electric field is defined as the amount of work done per unit charge in bringing a test charge from infinity to that point in the electric field.
(ii) The method of induction charges an uncharged body by bringing a charged object near it, causing a redistribution of charges in the uncharged body without direct contact. The method of contact charges an uncharged body by direct contact with a charged object, allowing electrons to transfer between them until they reach equilibrium.
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PHYSICS-ANSWERS
QUESTION 1
No 1
To use dimensional analysis to determine the values of x, y and z, let’s first look at the dimensions of each variable:
F = force
v = velocity
p = density
A = surface area
Using the dimensions of these variables, we can write:
F = [M L T^-2] v = [L T^-1] p = [M L^-3] A = [L^2]
Substituting these dimensions into the given equation, we get:
[M L T^-2] = k [M L^-3] ^x [L T^-1]^y [L^2]^z
Simplifying the right-hand side, we get:
[M L T^-2] = k [M^x L^(-3x+2y+2z) T^(-y)]Equating the dimensions on both sides, we get:
For mass: 1 = x
For length: 1 = -3x + 2y + 2z
For time: -2 = -y
Solving for x, y, and z, we get:
x = 1
y = 2
z = 0
Therefore, the values of x, y, and z are 1, 2, and 0 respectively.
(4)
TABULATE PLS
=GEO-STATIONARY SATELLITES=
(i) Orbital: Revolve in equatorial orbits and complete one circle of the earth in 24 hours
(ii) Distance from the Earth surface: Placed at a height of 36000km from the Earth surface.
(iii) Uses: Uses as communication satellites.
=POLAR SATELLITES=
(i) Orbital: Revolve in polar orbits of the earth and take less time to complete one circle of earth
(ii) Distance from the Earth surface: Placed at a height of 500800km from Earth surface.
(iii) Uses: Remote sensifig, weather, science and environment related studies
(7a)
Fiber optics is a technology that uses optical fibers to transmit data as light signals, delivering high bandwidth, electromagnetic immunity, and low signal loss.
(7b)
(i) Fiber optic cables transmit data much faster than copper wires do because fiber optics use the speed of light rather than the speed of electrons.
(ii) Fiber optic cables are not affected by potential electromagnetic interferences that can come from proximity to heavy machinery like copper wires are
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