Astronomy | Astrophysics Answers

A large number of identical point masses m are placed alone x-axis at x= 0,1,2,4,..... The magnitude of gravitational force on mass at origin(x=0) will be
1. Gm^2
2. (4/3) Gm^2
3. (2/3) Gm^2
4. (5/4) Gm^2

What is the force of gravity between Jupiter and Saturn? The mass of Jupiter is 6.4x10 24kg. The mass of Saturn is 5.7x10 26kg. The distance between Jupiter and Saturn is 6.52x10 11m.

Most asteroids are found between 2.1 and 3.3 AU. Use Kepler's third law to calculate the range of orbital periods associated with these orbital sizes

if the distance to earth at the time was 9x10^7 km and radio waves travel with a speed of 3x10^8 m/s, how long did it take for the signal to reach listeners on Earth?

can a situation exist in which an object has zero acceleration and nonzero velocity?

What is cosmic background radiation? Explain why it is so important to the debate between evolving and a steady-state universe.

The mean distance of Mars from the Earth is 0.5 A.U. and its orbital period is 687 days.
Calculate the orbital period of Jupiter given that its mean distance from the Earth is
4 A.U.

If the temperature of the background radiation today is 3k , at what time after the birth of universe was the temperature (10)15 k? Take the age of the universe as 15 * (10)9 years .

An electron is moving with a speed of 0.9c in a magnetic field of strength (10)6 G. Calculate the peak frequency at which the electron will radiate.

Explain why elements heavier than iron con not form as a result of thermonuclear fusion reaction in nucleosynthesis . Discuss s- and r- processes for the formation of elements heavier than iron.