Explain the following terms with the help of a diagram, wherever needed celestial
sphere, zenith, circumpolar stars, diurnal circle, resolving power of a telescope.
After about 1 billion year, the radius of a star is expected to increase by 100 times its
present radius. If its temperature becomes half of what it is today, determine the
change in its absolute magnitude.
three particles of mass 10 g are placed at the vertices of an equilateral triangle of side 30 cm.find distance of its centre of mass from any of its vertex and moment of inertia of the system of particles about an axis passing through the centre of mass of the system and perpendicular to the plane containing them
The change in the value of acceleration of earth towards sun, when the moon comes from the position of solar eclipse to the position on the other side of earth in line with the sun is? (mass of moon = 7.36 × 〖10〗^22 kg, orbital radius of moon = 3.8 ×〖10〗^8 m)
If the singularity at the time of the Big Bang were of infinite density,
a) would time stand still?
b)would the absolute duration of a second then be much greater than it is now?
At what distance can an incandescent heavenly body rotating at 1 rev/ sec cause photons to sweep across the earth's surface faster than c? Is this possible, please?