You are working at a company that explores new ways of generating and storing energy in an effort to reduce the world's dependence on oil. your supervisor explains a new method of storing energy that has been proposed. a huge underground superconducting solenoid of inductance 45.0 h, 1.20 km in diameter, would be fabricated. each winding of the 150-turn solenoid would be made from nb3sn wire and would carry a maximum current of 20.0 ka.
a. your supervisor asks you to determine the total energy (in j) that could be stored in the coil.
b. she is also concerned about the structural integrity of the coil and requests that you determine the compressive force (in n) acting between two adjacent windings of the coil that are 3.88 m apart. (enter the magnitude.)

It is the areas with lines. this may sound a little confusing, but i hope it !

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)