How much power does a weightlifter expend when lifting a 50-kg (500N) barbell a vertical distance of 1.2 m in a time interval of 1.5 s

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?