One kind of slingshot consists of a pocket that holds a pebble and is whirled on a circle of radius r. the pebble is released from the circle at the angle θ, so that it will hit the target. the distance to the target from the center of the circle is d. (see the drawing, which is not to scale.) the circular path is parallel to the ground, and the target lies in the plane of the circle. the distance d is ten times the radius r. ignore the effect of gravity in pulling the stone downward after it is released and find the angle θ.

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n