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

The Rite of Spring was composed by A. Heitor Villa-Lobos. B. Alban Berg. C. Igor Stravinsky. D. Arnold Schoenberg

A 90 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 43.1 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came.

24. Suppose a clay model of a koala bear has a mass of 0.200 kg and slides on ice at a speed of 0.750 m/s. It runs into another clay model, which is initially motionless and has a mass of 0.350 kg. Both being soft clay, they naturally stick together.

Grains of fine california beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.6 * 103 kg/m3.

3/4 of pan of brownies was sitting on the counter you decided to eat 1/3 of the brownies in the pan how much of the whole pan of brownies did you eat

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)