Doubtly
@Doubtly · Joined Feb 2021
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- d. Displacement reaction 3. Explain the following terms with examples. The reaction in which the place of the ion of a less reactive element in a compound is taken by another more reactive element by formation o... 1
- c. Balanced equation 3. Explain the following terms with examples. A chemical equation in which the number of atoms of the elements in the reactant is same as the number of atoms of the elements in the produ... 1
- b. Combination reaction 3. Explain the following terms with examples. When two or more reactants combine in a reaction to form a single product, it is called a combination reaction. Example:: When HCl vapours s... 1
- There is a stream of neutrons with the kinetic energy of 0.0327 eV. The kinetic energy of neutron is displaystyle 1/2mu²=0.0327× 1.6× 10⁻¹⁹J --the unit eV is converted to J by multiplying with 1.6×10⁻¹⁹ The m... 1
- There is a stream of neutrons with a kinetic energy of 0.0327 eV. The kinetic energy of neutron is displaystyle 1/2mu²=0.0327× 1.6× 10⁻¹⁹J --the unit eV is converted to J by multiplying with 1.6×10⁻¹⁹ The m... 1
- A flywheel used to prepare earthenware pots is set into rotation at 100 rpm. It is in the form of a disc Given : f_(1 )= 100 rpm, f₂= 80 rpm, M =10 kg, R = 0.4m, m = 1.6kg I₁=I_(wheel )= 1/2 MR² = 1/2(10)(0.4)² ^( )= 0.8 kg m² MI of the wheel an... 1
- The road in the question 14 above is constructed as per the requirements. Given : r=72m, θ= 78°4’ , μ_s=0.8, g= 10m/s^(2 ), tanθ= tan78^(°)4’ =5 V_min =√(rg(tanθ-μ_s/1+μ_stanθ)) V_min= √(72×10(5-0.8/1+(0.8((5))) v_... 1
- A metallic ring of mass 1 kg has moment of inertia 1 kg m2 when rotating about one of its diameters The MI of the thin ring about its diameter, Ir = 1/2MR² = 1 kg\ m² Since the ring is melted and recast into a thin disc of same radius R, th... 1
- State and explain the principle of conservation of angular momentum. Use a suitable illustration. Do we use it in our daily life? When? Law (or principle) of conservation of angular momentum : The angular momentum of a body is conserved if the resultant external torque on the... 1
- Derive an expression that relates angular momentum with the angular velocity of a rigid body. Consider a rigid body rotating with a constant angular velocity w about an axis through the point O and perpendicular to the plane of the fi... 1
- State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. The theorem of parallel axis is applicable to any body of arbitrary shape. The moment of inertia (MI) of the body about an axis through the... 1
- Using the energy conservation, derive the expressions for the minimum speeds at different locations along a Consider a particle of mass m attached to a string and revolved in vertical circle of radius r, At every instant of motion there are only tw... 2
- While driving along an unbanked circular road, a two-wheeler rider has to lean with the vertical. (i) When a bicyclist takes a turn along an unbanked road, the force of friction Fs provides the centripetal force; the normal reaction of th... 1
- Why is it useful to define radius of gyration? Radius of gyration is defined as the distance from the axis of rotation to a point where the total mass of the body is supposed to be concen... 2
- Distinguish between crystalline solids and amorphous solids. Crystalline solids Amorphous solids They have definite characteristic geometrical shape as constituent particles are arranged in orderly reg... 1
- What are diamagnetic substances? The diamagnetic materials are those materials which weakly repel the external magnetic field. 1
- Name the bravais lattice in the triclinic system The bravais lattice in the triclinic system is a simple or primitive unit cell. 1
- Write the effect on density of a substance in the Frenkel defect? The density remains unchanged in Frenkel defect. In the frenkel defect an ion takes a place at an interstitial position. Hence there is no i... 1