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Boyle‘s law stats that the volume of a given mass of a gas, at a constant temperature is inversely proportional to us pressure. Mathematically V ∝ l/p, v = k/p (where k is constant) K = VP Let k = k1 Then, if k = k, V and P = V1P1 V1P1 = V2P2

Ray – a beam of light or radiation

XL = WL = 2πFL (w = 2πf) XL = reactance inductor (S.I unit Ω) L = inductance (L) in Henry XL = 1Ω, f = 50/π, L = ? 1 = 2× π × 50/π × L 1 = 100L i.e. 100L = 1 L = 1/100 0.01H ∴ Inductance (L) of a inductor = 0.01H

Stroboscope is a scientific instrument used to make a wave appears stationary when used

In an inelastic collision, linear momentum is conserved and energy is decreased Momentum and kinetic energy are conserved in elastic collision

Note:The principle of floatation states that a floating body displaces its own weight of the fluid or which its float. For object to sink weight of the object (W) > upthrust of the fluid (v) i.e. w > u (i.e. weight of the body (or object) mass of the fluid)

Formula for general gas law V × 1/T × P N [(PV) ÷ T] = K is constant

The appearance of pool of water on road surfaces is called MIRAGE His observation show that light from the sun ray refracted through a layer of hot air(layer) which is closed to the ground, passes from a hot air layer to the cold layer

Sun are self luminous source Moon is a non – luminous

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