Please answer this question below rounding to the correct numbers of significant digits/figures

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

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

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.