Collect information about the path of revolution of moon around the earth and write a report.

Classify the following motions based on duration and speed. Revolution of Moon around the earth

The Moon takes ----days to complete one revolution around the Earth.

Collect the information about the base area and stability of some objects with different shapes and write a report.

The moon takes _________ days to complete one revolution around the Earth

Collect the information about the animals which communicate through Infrasonics or ultrasonics. Collect their pictures and write a report on their communication technique.

If the height of a satellite completing one revolution around the earth in T seconds in h_(1) meter, then what would be the height of a satellite taking 2sqrt(2) T. seconds for one revolution ?

We know that the sound is a form of energy. So, the large amount of energy produced due to the sound pollution in cosmopolitan cities can be used to our day to day needs of energy. It also helps us to protect biodiversity in urban areas”. Do you agree with this statement? Collect information on this and write a report.

Gravitational waves: Waves are created on the surface of water when we drop a stone into it. Similarly you must have seen the waves generated on a strintg when both its ends are held in hand and it is shaken. Light is also a type of wave called the electromagnetic wave. Gamma rays, X-rays, ultraviolet rays, infrared rays, microwave and radio waves are all different types of electromagnetic waves. Astronomical objects emit these waves and we receive them using our instruments. All our knowledge about the universe has been obtained through these waves. Gravitational waves are a very different type of waves. They have been called the waves on the fabric of space-time. Insteine predicted their existence in 1916. These waves are very weak and it is very difficult to detect them. Scientists have constructed extremely sensitive instruments to detect the gravitational waves emitted by astronomical sources. Among these, LIGO (Laser Interferometrc Gravitational Wave Observatory) is the prominent one. Exactly after hundred years of their prediction, scientists detected these waves coming from an astronomical source. Indian scientist have contributed significantly in this discovery. This discovery has opened a new path to obtain information about the Universe. What are the waves on the fabric of space time called?

Write about the sulphates of alkaline earth metals.