If the earth be one-half its present distance from the sun, how many days will be in one year?

How many ergs are there in one joule?

How far is the sun from the earth?

A sum is taken for one year at 16 % p.a. If interest is compounded after every three months,how many times will interest be charged in one year?

Earth's orbit is an ellipse with eccentricity 0.0167. Thus, earth's distance from the sun and speed as it moves around the sun varies form day to day. This mean s that the length of the solar day is not constant through the year. Assume that earth's spin axis is normal to its orbital plane and find out the length of the shortest and the longesst day. A day should be taken from noon to noon. Does this explain variation of length of the day during the year?

If the earth suddenly shrinks to half of its present radius, the acceleration due to gravity will be

How does the heat energy from the sun reaches earth?