Ali has a modle of earth that has a diameter of 12 centimeters. ehat is the serface area of this modlel

For reasons that might eventually be proven in a later calculus course, the surface area of a sphere is given by the formula

A = 4r²π

or, since the radius r is half of the diameter d (d = 2r):

A = d²π

Since our diameter is 12 cm, the area would then be

12²π = 144π cm²

hiking down a winding trail.

step-by-step explanation:

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v