Two are true, one is not

Exercise and reference answers

Questions

1. False statement

   Linear momentum is conserved under gravity

   Statements

   1. Angular momentum is conserved under gravity
   2. Linear momentum is not
   3. Linear momentum is conserved under gravity

2. False statement

   Weightlessness comes from weak gravity

   Statements

   1. Weightlessness comes from weak gravity
   2. Weightlessness comes from free fall
   3. Gravity is still strong in low orbit

3. False statement

   Its constant differs for every planet

   Statements

   1. Kepler's third law uses the cube of the radius
   2. Its constant differs for every planet
   3. Its constant is shared by planets in circular orbits

Explanation