cbse class 9 physics

The half life of radon is 3.8 days. Calculate how much radon will be left out of 10.24 milligram after 19 day..

- This is a representative list of topics covered in our Grade 9 Physics program - however all programs will be customized for the individual studen..

Once the nucleus has been divided by fission, the neutrons that are emitted can strike other nuclei. This energy released is extremely large. The neutrons produced during the fission are called secondary neutrons. These neutrons may bring about the fission of three more 9 2 U 2 3 5 ..

. When a small cog and a large cog turn together, the larger cog always turns more slowly and with greater force than the smaller cog. The easiest way to calculate how much the large cog multiplies the force exerted by the small cog is to count the teeth of the cogs. You can then multiply the force..

Planets are the largest objects in the solar system except for the sun. Unlike the sun, the planets do not produce their own energy. They reflect the heat and visible light produced by the sun. The four planets near the Sun - Mercury, Venus, Earth and Mars are called terrestrial (earth-like) planet..

Many scientists believe that our solar system was formed from a giant, rotating cloud of gas and dust known as the solar nebula. According to this theory, the solar nebula began to collapse because of its own gravity. Some astronomers speculate that a nearby supernova (exploding star) triggered the..

Summary - The solar system consists of sun, the nine planets and their satellites and thousands of other smaller heavenly bodies such as asteroids, comets and meteors. The sun is a star of intermediate size and luminosity. The sun appears to be larger and brighter than other stars because..

M.A., V.R. and efficiency have no units as they are ratios between similar quantiti..

Numerical : ..

From equations (1) and (2) The first equation of motion is v = u + at. Substituting the value of v in equation (3) we get ..