Tamil Nadu Board Solutions for Chapter: Universe, Exercise 1: textbook exercises

Discuss the benefits of ISS?

Write a note on orbital velocity?

Why do some stars appear blue and some red?

How is a satellite maintained in nearly circular orbit?

Why are some satellites called geostationary?

A man weighing $60 \mathrm{kg}$ in the Earth will weigh$1680 \mathrm{kg}$ in the sun. Why?

Calculate the speed in  $\mathrm{m} {\mathrm{s}}^{-1}$ with which a satellite moves if it is at a height of $36,000 \mathrm{km}$ from the earth's surface and has an orbital period of $24 \mathrm{hr}$. (Take $R=6370 \mathrm{km}$)

At an orbital height of $400 \mathrm{km}$, find the orbital period of the satellite in minutes.( Take $R=6370 \mathrm{km}$, $M=5.972\times {10}^{24} \mathrm{kg}$, $G=6.673\times {10}^{-11 }\mathrm{N} {\mathrm{m}}^2 {\mathrm{kg}}^{-2}$)