physics questions for class 9

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..

. Then the time period of the pendulum T is given by the relatio..

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 i..

. 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..

The Planets - 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 (eart..

Formation of Our Solar System - 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 supernov..

. Now the question is why we do not see the Earth moving towards the stone. Newton's second law of motion gives a correct explanation for this. According to the second law of motion, whenever a force is acting on an object, it produces acceleration in it. The gravitational force of attrac..

Force Work Power Energy and Machines..

The diagram shows a lever in use. (i) To which class of lever does it belong? Give one example of this class. (ii) Calculate its MA if AB = 2.0 m, AF = 20 cm. (iii) Calculate the effort needed to lift the load. Suggested answer : (i) Class I, example: scissors (ii) Loa..