If the mass of the earth and all objects on it were suddenly doubled, but the size remained the same, the acceleration due to gravity at the surface would become
a) 1/2 of what it now is.
b) 2 times what it now is.
c) 1/4 of what it now is.
d) the same as it now is.
e) 4 times what it now is.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

7types of electromagnetic waves from lowest to highest frequency