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Note: moment of a couple = force × length (fL) The tangential force is actingin an opposite direction alongside its length i.e f1 L1 = f2L2 f2L2 − f1 L1 = 0(i.e Zero)

A vector quantity has both magnitude and direction

Simple pendulum does not depend on thermal expansion Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid

Energy due to position T is potential energy (P.E) Energy due to motion is kinetic energy (K.E)

F = \(\frac{Gm_1 m_2}{r^2}\) \(M_1 = 10^{24}\)Kg, \(M_2 = 10^{27}\)Kg , r = \(10^{20}\)meters (Note: the gravitational constant of G = \(6.67408\times10^{-11}Nm^2/kg^2\)) F = \(\frac{(6.67 \times 10^{– 11 + 24 + 27})}{ 10^{40}} = 6.67 \times \frac{10^{40}}{10^{40}}\) = 6.67N f = 6.67N

As object and image are usually at equal distance apart from the mirror /p> Distance between Abioye (a) and hip image (I) = AI i.e. AI = 4.7 + 47 = 9.4m

Primary colours of light are red, blue and green Secondary colours of light are cyan, magneta and yellow

J.J. Thompson discovered ELECTRONS

he relationship between M.A, V.R, e and 100% can be written as e = M.A/V.R × 100 % i.e E/100 = M.A/V.R = L ÷ E/x ÷ y = Ly/Ex E/100 = Ly/Ex

Vernier calliper is used to measure the internal and external diameter of an object

Note: T = 273 + θ θ = 45° T = 273 + 45 = 318K

Weightlessness:– The state of being free from the effects of gravity. (zero gravity)

A radio waves is an electromagnetic waves which travels with a constant velocity of 3 × 108m/s

The vibrating particles behave like a spiral spring with a series of compression region and space–out region.

Work (w) = Force (f) × Distance (d) Note: f = ma = mass × acceleration = mass ×acceleration ×distance = kg ×ms–2 × m = kg m2 5–2 (Note: the dimension of kg = M, M = L & S = T) Work = ML2 T–2 = Ma Lb Tc i.e. Ma Lb Tc = as 1, b = 2, c = –2 The value of a, band c = 1, 2, –2