Earth Ultra Zoom Out

Out of the following radioactive substances which are not found in naturally on Earth? Tritium Deuterium Uranium Plutonium

Air is more dense near the earth. It goes on thinning out as we go up.

The earth taken out from a pit is evenly spread over a rectangular field of length 90m, width 60m. If the,volume of the earth dug is 3078m^(3). Find the height of the field raised.

The mass of a spaceship is 1000kg. It is to be launched from the earth's surface out into free space. The value of g and R (radius of earth) are 10m/s^2 and 6400 km respectively. The required energy for this work will be:

In the ultra structure of cell membrane and its functions,

Find out the capacitance of the earth ? (Radius of the earth = 6400 km)