1) Velocity of Sound = Frequency × Wavelength
2) Rate of flow of current = charge/time
3) R = V²/P or P=V²/R [R = Resistance, P = Power, V = Volt]
4) Impulse = Force × Time
"Units of Impulse and Momentum are equal. It is Kg•m/s
5) There are 6 inert gas or noble gas found, that's are — (i) Helium (H) , (ii) Neon (N) , (iii) Argon (Ar) , (iv) Krypton (Kr) , (v) Xenon (Xe) , (vi) Radon (Rn).
6) In 100g of water maximum 36g of NaCl can be dissolved.
7) Mass of saturated solution = Mass of Solute + Mass of water.
8) 3 classes of levers —
(i) Class -1 : Fulcrum placed between the effort and load.
(ii) Class -2 : Load in between the effort and fulcrum.
(iii) Class -3 : Effort between the load and fulcrum.
9) Momentum = Mass × Velocity
10) Two richest source of edible protein are Soyabean and Groundnut.
11) দ্রুতি দ্বিগুণ হলে বস্তুর গতিশক্তি চার গুণ হবে। Keep speed to is the kinetic energy will become 4 times of an object.
12) K.E. or Ek = 1/2 × m × V² [KE=kinetic energy, m=mass of the object, V=velocity of the object]
13) ত্বরণ = (চূড়ান্ত বেগ - প্রাথমিক বেগ) / সময়