Astronomy | Astrophysics Answers

the zenith distance of a star at latitude 60°N is 25° calculate its declination

a dry cell of emf 15v and a internal resistance 0.5 is connected to a component of resistance 7 ohms , find the power input to the component, the power wasted within the cell , the power which would be wasted if the cell terminals were short circuited

1. a) Compare the brightness of the stars Sirius B and Sun using the data given in Table
1.3 of Unit 1.
b) Express the distances of the stars Sirius A and Antares from the Earth in light years.
2. a) The zenith distance of a star at latitude 60° N is 25°. Calculate its declination.
b) Explain the horizon coordinate system with the help of a diagram.
c) The local time at Allahabad is 5 PM. Calculate the local time at New Delhi at that time.
3. a) Explain the nebular model of the solar system.
b) Show that the magnitude of the tidal force experienced on the Earth due to the Moon depends on the latitude.
4. a) The absolute visual magnitude of a star is 6.5 and for its temperature, the bolometric correction is − 0.3. Calculate the absolute bolometric magnitude and the luminosity of the star.
b) What is H-R diagram? Discuss the characteristic features of stars located in any two distinct regions of the H-R diagram.
c) Explain how fusion reactions are made possible in the stars.

The mass moment of inertia I of a homogeneous sphere about its diameter is I = (2/5)m R^2, where m and R are its mass and radius, respectively. Find the dimension of I in items of the absolute {

how the distance on earth are inter related where as the earth is in parabola shape?

calculate the value of acceleration due to gravity at point:
(a)5.0 km above the earth`s surface and
(b)5.0 km below the earth`s surface.Radius of earth=6400km
and the value of g at the surface of the earth is 9.80 m/s^2

The Saturn V rocket that took the first astronauts to the moon had a mass of 5 tonnes. Its stage 1 rockets fired for 6 minutes and took the rocket to an altitude of 67km. How much work did the stage 1 rockets do in this time?

the planet mars takes 1.88 years to complete on revolution around the sun. the mean distance of the earth from the sun is 1.5x1o*8 km . calculate that of planet of mars

Consider a galaxy which is 100 million light-years away. Calculate its speed (in km/s), assuming that the Hubble constant is 22 km/sec/million light-years. Enter your answer in the blank (numbers only - no units!).

A microwave has a 3cm wavelength. How many complete microwaves could you fit into a long wave radio wavelength of 1000m