What is the electric force between a glass ball that has +4 × 10−6 c of charge and a rubber ball that has −6 × 10−6 c of charge when they are separated by a distance of 6 cm? the value of the coulomb constant is 8.98755 × 109 n · m2 /c 2 . answer in units of n.

Ibelieve the answer is d. densityhope my answer has you : )

//(b) both involve the use of levers;

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.