Astronomy | Astrophysics Answers

One of Saturn's moons has an orbital distance of 1.87 x 108 m. The mean orbital period of this moon is approximately 23 hours. Use this information to estimate a mass for the planet Saturn.

Derive an Expression for the tidal force for the earth- moon system and show that its magnitude depends on the latitude. Explain tidal bulge on the basis of this expression.

Explain how we estimate the effective surface temperature of the Sun.

The mean free path of photons in stars is of the order of 0.2 cm. Show that the time taken for a photon to reach the surface of a star of radius 4 RQ is of the order of one million year.

The length of second pendulum is decreased by 0.3 cm when it is shifted to chennai from london. If the acceleration due to gravity at London is 981 cm/sec^2, the acceleration due to gravity at chennai is :

Two ping-pong balls, each with a positive charge of 2.5 x 10^-5 C, are located 9.0 cm apart. Determine the size of the electric force between them. Would this be enough force to support a 70 kg person against the downward force of gravity?

The mean free path of photons in stars is of the order of 0.2 cm. Show that the time
taken for a photon to reach the surface of a star of radius 4 Ro is of the order of one
million year.

Explain how sunspots survive for so long even though they are surrounded by hotter
matter. (A 5 marks answer is needed, so please don't give a brief answer)

significant digit for 1,345,000

What are the 3 types of Radioactivity?