Aspacecraft is moving at 225 m/s upward; its momentum is 45,000 kg·m/s upward. what is its mass? a. 200 kg b. 100 kg c. 45,000 kg d. 10,125,000 kg

If element x has 99 protons how many electrons does it have

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

What does the law of conservation of mass state?