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

A missile is fired from a jet flying horizontally at Mach 2 (2200 ft/s). The missile has a horizontal acceleration of 1000 ft/s2. Calculate its horizontal velocity at 10.0 seconds after it is fired.

Which statement describes potential energy?

Which of the following systems possesses the highest entropy? A new pack of playing cards, unopened and unshuffled A pack of playing cards shuffled and ready to be used Playing cards in hand and in use A new pack of playing cards unshuffled but open

What specific structures are in electroreceptors?

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is

The Amazon River is in Europe. True or False

A microwave oven operating at 120 volts is used to heat a sandwich if the oven draws 12.5 amperes of current for 45 seconds what is the power dissipated by the oven?

Which of the transformers are step-up transformers? Which of the transformers are step-down transformers?

1 A plane moving at 30m/s drops a load 200m down to the ground. How long did it take to hit the ground.

Can a body be in equilibrium if it is in motion? Explain