Find the luminosity of Sun using the formula given in the attachment. Just started learning Astrophysics for fun. Please tell me your opinions in the comments too.

100 points for this question

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

Debris produced by mining is called

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match