What is the angular momentum of a hydrogen atom in a 4p state? give your answer as a multiple of ħ.

State the right hand rule of the direction of magnetic field in a conductor carrying current

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.