How did people years ago find out which side of a magnet was north and which was south?

Why do planets and stars have layers?

1. A seismograph station is located 2000 km from an earthquake's epicenter. Explain the order that the S and P waves will arrive at the station. Using what you know about the characteristics of the different waves, explain your answer.

Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?

One horsepower (hp) is the amount of power required to lift a 75-kg mass a vertical distance of 1 m in 1 s. What is 2 hp equivalent to in watts (W) ?

Can you access an instance variable from a static method? explain why or why not.

tessa bought stock in a restaurant for $287.00 her stock is now worth $401.80 what is the percentage increase of the value of Tessa's stock?

Withholding Judgment on the mentally Ill is wise because It saves you from embarrassing yourself often people have disorders that don't affect you then you can try to understand what a person is experiencing all of the above

A 1200 W refrigerator, a 1500 W electric frying pan, and a 200 W lamp are plugged into the same outlet in a 15 A, 220 V circuit. (these devices are in parallel when plugged into the same socket.) What current (in A) is drawn by refrigerator?

1. Calculate the total resistance for a 650 ohm, a 350 ohm, and a 1000 ohm resistor connected in series.

What is the study of motion of objects, and related concepts of force and energy