Astronomy | Astrophysics Answers

Mars has an albedo of 15\%

15%. Given that it doesn't have much of an atmosphere, estimate the mean surface temperature on Mars. Note: the semimajor axis of the orbit of Mars is 1.52 AU.

What is the minimum required velocity in km/s of the satellite to escape from the gravitational attraction of the earth? Assumed a circular orbit with an altitude of 4,830 km.

What is the first stage of a star's life

What is the minimum required velocity in km/s of the satellite to escape from the gravitational attraction of the earth? Assumed a circular orbit with an altitude of 4,220 km.

At the instant the bob of an oscillating pendulum reaches the equilibrium position, the displacement is zero. Which of the following statements correctly describes the kinetic energy of the bob and the tension in the thread from which it is hanging at zero displacement?

A. Zero k.e and max tension

B. Max k.e and max tension

C. Max k.e and min tension

D. Zero K.e and Min tension

1kg of iron (density 7.8gm/cm³ and 1kg of aluminum (density 2.5gm/cm³) are thrown in a well. Which one will experience the greatest buoyant force?

A.Iron

B.Aluminum

C. Both will experience the same buoyant force

D. None

2.2 What is the theory of relativity?

2.3 What are the two theories of relativity?

2.4 What is the difference between the two theories of relativity?