All magnets must have exactly two poles, one north and one south. Explain how scientists determine the poles of an unlabeled magnet

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

What part of the ear is names after tools, such as the hammer and the anvil?