Which of the following describes the reaction in a hydrogen fuel cell? a. 2h + o h2o b. h + h h2 c. 2h2 + o2 2h2o d. 2h2o 2h2 + o2

Aparticle with mass 1.81×10−3 kg and a charge of 1.22×10−8 c has, at a given instant, a velocity v⃗ =(3.00×104m/s)j^. what are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field b⃗ =(1.63t)i^+(0.980t)j^?

If steel is more dense that lake water, why can a boat float

What are similarities and differences between refraction, reflection, diffraction and absorption?