4. Two masses of 3.7 kg and 5.5 kg are attached to either end of a massless rod of length 0.78 m. Compute the moment of inertia for:
a) The rod is rotated about its midpoint.
b) The rod is rotated at a point 0.15 m from the 5.5 kg mass.
c) The rod is rotated about the position of the 5.5 kg mass.

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

the answer is to check all of them! they all apply well at least i think so!

answer(20) psi;