What is the kinetic
energy of a body of a
mass 12kg and moving
with a velocity of
200m/s ?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.