1. Which has more inertia. (a) A stone or a tennis ball of the same size. 1mark 2. Air contains specific proportion of oxygen (21%) and Nitrogen still it is considered a mixture. Why?
A compound was found to have the following percentage composition by mass Zn = 22.65%, S = 11.15%, H = 4.88%, O = 61.32%. The relative molecular mass is 287g/mol. Find the molecular formula of the compound, assuming that all the hydrogen in the compound is present in water of crystallizations.
Bilateral symmetry – Body can be divided into two similar halves only by one plane that passes through the central or median axis eg – tortoise, humans. Coelom – It is the body cavity which is lined externally as well as by regular layer of mesoderm Triploblastic – When the body of an animal develops …
Sun – the sun heats up rocks during the day so that they expand. In night, the rocks cool down and contract. Unequal expansion and contraction in different parts of rock results in the formation of cracks and turns into soil.
When a wave travels from one medium to another, the wavelength changes but not the frequency. The wavelength of sound disturbance 30 cm in air and of the wave velocity is 340 m/s. What will be the wavelength of this disturbance in Helium & water? The speed of sound in helium is 970 m/s and …
When a nucleus emits a γ – ray than there is no change in the mass or charge of nuclide but energy of nuclide decreases by an amount equal to energy of photon emitted.
A system which protects our body from diseases and infections is known as immune system. This system is developed in adults due to long term exposure to environment. Children fall ill more frequently because they do not have well developed immune system.
Derive an expression for the kinetic energy of the body? Calculate the kinetic energy for a body of mass 5 Kg moving a velocity 2.5m/s2