Two charges, q1 = 3 X 10^-6 C and q2 = 3 x 10°C, are connected by an insulating rod 10 m long. The rod is pivoted about its midpoint. The rod is kept horizontal 10 cm above the floor. Two identical charges, q = 5 x 10^-6 C, are fixed directly below q1 and q2, as shown Where should a 3-kg weight be placed on the rod. keep the rod horizontal? ​

In the middle of the night you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of your rich uncle. the top of the fence is 5.00 m above the ground. you have taped an important message to a rock that you want to throw over the fence. the ground is level, and the width of the fence is small enough to be ignored. you throw the rock from a height of 1.60 m above the ground and at an angle of 54.0 degrees above the horizontal. part a part complete what minimum initial speed must the rock have as it leaves your hand to clear the top of the fence? express your answer with the appropriate units. part b for the initial velocity calculated in the previous part, what horizontal distance beyond the fence will the rock land on the ground?