Suppose you have 4 stars with given initial conditions (positions and momenta). the net force on each star is the vector sum of 3 forces exerted by the other 3 stars, for a total of 12 forces that must be evaluated in each iterative step. in each step, how many forces would you have to calculate fully, and how many forces could you calculate simply by reversing vectors already calculated?

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.

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures