Beings on spherical asteroid π have observed that a large rock is approaching their asteroid in a collision course. at from the center of the asteroid, the rock has a speed of and later at it has a speed o f use energy conservation to find the mass of asteroid π. you can neglect any effects due to the parent star of the asteroid. (g = 6.67 × 10 ^-11 n ∙ m^2/kg^2).a. 6.112 x 10^28 b. 4.582 x 10^20c. 4.582 x 10^21d. 9.164 x10^2

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.