Astronomy | Astrophysics Answers

Questions: 1 121

Answers by our Experts: 995

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Search & Filtering

Calculate the value of the g at a hight h = 4R from surface earth ( take g = 10m/s) at the earth


  1. A ray of light from the sun strikes the windshield of a car at an angle of incidence of 36.0° and refracts at an angle of 24.0°. If the initial light had a wavelength of 630 nm, determine the wavelength of the light after it has refracted.  

 At a distance of 55 million light years from Earth, and with a mass equal to 2.4e12 solar masses, calculate the angular diameter of that black hole's event horizon as viewed from the Earth. (express your answer in arcseconds)

-Tidal heating aspect of Astronomy
-link all the relevant physics ideas to each other and to the context to integrate them into your explanation of how or why the physics relates to tidal heating.
-The key physics ideas tidal heating should include:
Newton’s law of gravitation and tidal forces
Centre mass of orbiting systems
Satellite motion (Kepler’s laws)
Synchronous orbits and how they form over time
Orbital resonance of Jupiter’s moons and the implications of this for tidal heating
Find the time taken by sunlight to reach the ground if the distance between the sun and earth is 1.5x10 8 km, velocity of light is 3x10 8 m/s.
What evidence do we have that the Great Red Spot of Jupiter is a high pressure region without flowing gas?
Estimate the rate of hydrogen fusion at the sun’s core. You may assume the following:
Average energy emission per hydrogen atom in hydrogen fusion = 6.55 MeV
The luminosity of the Sun = 3.86 ×10^26 J/S
The density of a star varies as d(r) = d(0) {1-(r/R)^2} . Estimate the minimum mass that a star should have to ignite hydrogen fusion at its centre. You may assume that the star is not rotating and the temperature required for hydrogen fusion is 6×10^6 K?
A low mass star evolved as white dwarf with one solar mass and radius equal to 0.9 times the Earth radius. Estimate the escape velocity of the white dwarf and the Gravitational red shit of the carbon spectral line of wave length 700nm.
If the Horizontal component of the electric filed at 15 N/C and vertical component is 21 N/C find the direction (θ) of resultant electric ?.
LATEST TUTORIALS
New on Blog
APPROVED BY CLIENTS