10. The average acceleration due to gravity on the surface of earth is 9.8 m/s?. Find mass of the earth if the radius of earth is 6400 km.
[Take G = 6.67 *10-11 Nm²/kg?1

In a system, when potential energy decreases, then entropy also decreases. true false

What type of relationship exists between the length of a wire and the resistance, if all other factors remain the same? o a. resistance is directly related to length. ob. resistance is directly related to the square of the length. c. resistance is inversely related to the length. d. resistance is inversely related to the square of the length. reset next

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?