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

A clock moves past you at a speed of 0.9 c. How much time passes for you for each second that elapses on the moving clock? 0.436 s 1.15 s 2.29 s infinity

A journey of a thousand miles begins with a single step where does this sentence come from

Calculate the average speed if a cheetah runs 140 meters in 5 seconds

Astronomers are comparing two stars that are known to have the same luminosity. Star A is observed to be 4 times brighter than star B. How far away is Star A compared to Star B? 2 times closer 4 times closer 2 times farther 16 times closer

Which statement about electric force is true? A) It is a purely attractive force. B) It is a purely repulsive force. C) It is both an attractive and a repulsive force. D) It is neither an attractive nor a repulsive force.

A sound that's produced by a single wave at a constant frequency and with no overtones is called

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons

Gamma radiation can be significantly reduced by ... A sheet of paper Air A 3 mm thickness of aluminium Several cm of lead

Why is it possible to remove a paper without moving the object on it. (apply newton's law)

If you had a trapped gas and continued to cool it until the lowest possible temperature is reached the temperature is called