A piano with a mass of 130 kg is lifted 10m above the ground in 5 s by a crane. What is the power used by the crane

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Most fertilizers contain ammonia. ammonia (nh3) forms when hydrogen reacts with nitrogen. which balanced equation represents ammonia? 3h2 + n2 ? nh3 h2 + n2 ? 2nh3 h2 + n2 ? nh3 3h2 + n2 ? 2nh3