Which of the following best summarizes the law of conservation of mass? a. matter can be changed but not created or destroyed. b. matter can be destroyed during a chemical reaction. c. matter that gains mass during a chemical reaction is evidence that matter can be created.

How do we measure or think of speed in the united states?

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical