Jay wants to find out whether the number of turns of the wire around the steel rod affects the strength of the electromagnet. Which two set-ups below should she choose to conduct a fair test? 1) A and C only
2) A and D only
3) B and C only
4) B and D only

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

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.