Ahelicopter lifts a 84 kg astronaut 12 m vertically from the ocean by means of a cable. the acceleration of the astronaut is g/10. how much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed?

(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

Give an example in which the electrical energy changes to light energy

If anyone who can me with this hw? i would really appreciate it