Students and Teachers Forum
m2 is SI unit of area. m3 is SI unit of .....
1. Mass is a physical quantity because it can be measured. 2. Acceleration is rate of change of velocity and its unit is ms-2 i.e it is formed of two fundamental units metre and second. So it is derived .....
The quantity by which measurement is done is standard quantity. When you go to shop and ark for 1 kg of sugar, the shopkeeper used a standard 1 kg weight to measure unknown mass of sugar. This standard 1 kg weigh , is standard .....
Solution: Mass of ice m = 500 gm = 500/1000 Kg = 0.5 Kg Latent heat of ice L = 3.34 x 105 J/kg Amount of heat Q = ? We know, Q = L x m = 3.34 x 105 x 0.5 = 1.67 x 105 .....
Principle of calorimetry:
When two body of different temperature are kept in thermal contact, heat transfers takes place from the hot body to cold body and the process continues until the equilibrium (same temperature) state is .....
Principle of calorimetry:
When two body of different temperature are kept in thermal contact, heat transfers takes place from the hot body to cold body and the process continues until the equilibrium (same temperature) state is .....
The amount of heat gained or lost by a body is equal to the product of the mass (m), the specific heat capacity (s) and the change in temperature (dt) of that body is called heat equation.
Q= .....
Latent heat of vaporization is the heat consumed or discharged when matter disintegrates, changing stage from fluid to gas stage at a consistent .....
Latent heat of fusion of a substance is the heat consumed or discharged when matter melts, changing stage from strong to fluid-structure at a consistent .....
By adding or taking away heat we can change the state of the matter. Example: Taking away the heat, water turns into .....
The three states of matter are : solid liquid , .....
The briquetting process is the conversion of agricultural waste into uniformly shaped briquettes that are easy to use, transport, and store. The idea of briquetting is using materials that are unusable, due to a lack of density, and .....
Flowing water creates energy that can be captured and turned into electricity. This is called hydroelectric power or hydropower. The most common type of hydroelectric power plant uses a dam on a river to store water in a reservoir. .....
Wind energy isform of the kinetic energy. Wind eneryy is due to motion of air, also called .....
The sources of energy which can be used in replacement of fossil fuels are called alternative sources of energy. In the context of Nepal, following three sources of energy can be used as alternative sources: 1. Hydroelectricity: Nepal is .....
The advantage of bio gas are 1. Biogas is a renewable, as well as a clean, source of energy. 2. Biogas generation helps cut the use of fossil fuels, such as oil and .....
It would be easier for an operator to lift a load in a wheelbarrow if the load is transferred towards the wheel because the load’s weight is been distributed between wheel and operator. This distribution of weight makes the single operator .....
The animals and plants waste are degraded (decayed) by anaerobic bacteria in presence of water. In doing so, gases like CH4,CO2,H2S,H2,etc are formed. A mixture of these gases is called .....
Briquette is a biofuel. They are used to heat, cook, and for energy, where they heat industrial boilers in order to produce electricity from .....
The electricity produced from the running water by rotating turbines is called hydroelectricity. It is renewable sources of energy. Applications of hydroelectricity - It is used to run industries -It is used in the home for running different home .....
Disadvantages: A vast variety of flora and fauna (plants and animals) get affected. Dams can be constructed only at a limited number of places. Advantages: The generation of electricity from water does not produce any .....
Solution : Height h = 750 mm = 0.75 m density d = 13.6 gm / cm3 = 13600 Kg / m3 gravity g = 9.8 m / s2 Pressure P = h x d x g = 0.75 x 13600 x 9.8 = 99,960 .....
Given, Pressure P = 9.8 x 104 Pa = 98000 Pa Density of water = 1000 kg/m3 Acceleration due to gravity ( g ) = 10 m/s2 Depth of lake h = ? Now, Pressure exerted at the bottom = h x d x g .....
Given, Depth of rectangular tank ( h ) = 8 m Density of water = 1000 kg/m3 Acceleration due to gravity ( g ) = 10 m/s2 Now, Pressure exerted at the bottom = h x d x g .....
Stress is restoring force per unit area. Or you can say When a body is subjected to a deforming force, a restoring force occurs in the body which is equal in magnitude but opposite in direction to the applied force. This restoring force per unit .....
My Aim in Life Everyone has an aim in life. Without any proper aim, no one can grow in life. My aim in life is to become a good teacher. Educating little children is a real blessing. I shall teach in a school and give my students the gift of .....
Temperature, pressure (at very high value) and concentration are the factors on which viscosity of a fluid depends. By increasing the temperature the viscisity of a fluid decreases fue to increase in molecular motion. Pressure doesn't have .....
Viscosity is the property of fluid in motion by virtue of which a force of resistance exist between the different layer of the fluid whenever there is relative motion between them .....
The liquid Pressure is used in following ways : 1)When we spray deo through a bottle 2)we use in syringes 3)when we open a bottle of coke 4) when we open a tap we find the water gushin out through great pressure 5)It is also used in basic .....
Hooke's law is a law of physics that states that the force needed to extend or compress a spring by some distance x scales linearly with respect to that distance. That is, where k is a constant factor characteristic of the spring: its stiffness, .....
Stress is restoring force per unit area. Or you can say When a body is subjected to a deforming force, a restoring force occurs in the body which is equal in magnitude but opposite in direction to the applied force. This restoring force per unit .....
Sericulture, or silk farming, is the cultivation of silkworms to produce silk. Although there are several commercial species of silkworms, Bombyx mori is the most widely used and intensively studied silkworm. .....
The property of a material by virtue of it regain its shape and size , is called .....
A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid. .....
The viscosity of a liquid is a measure of the difficulty which molecules have passing each other in a fluid. It is dependent upon the size and shape of the molecules and by the magnitude of the cohesive forces and intermolecular bonds such as .....
Viscosity is the resistance of a fluid to change in shape , movement of neighbouring portions The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of .....
Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with gas, acts like a thin elastic sheet. This term is typically used only when the liquid surface is in contact with gas (such as the air). If the .....
The liquid pressure is
We have given, The mass of the earth (M)=6⨯1024 kg Height from the centre of the earth(R+h)=3600 + 6400 = 100000km = 107 m Gravitational field intensity I = ? Now use the following formula to calculate .....
Gravitational Field Intensity is simply a point in the gravitational field in which unit mass experience certain force. This force is known as gravitational field intensity. Its formula is I = F / m = (GMm/R2) / m = .....
The differences between scalar and vector quantities are .....
Gravitational intensity is defined as the measurement of the force that is experienced by a unit mass in the given field. Its Unit is .....
The center of gravity (CG) of an object is the point at which weight is evenly dispersed and all sides are in balance. A human's center of gravity can change as he takes on different positions, but in many other objects, it's a fixed .....
Nepal is a South Asian nation lying between 26o22'N to 30o27'N latitude and 80o4'E to 88o12'E longitudes. Nepal has an area of 147,516 .....