Four objects are situated along the y axis as follows: a 2.06-kg object is at +3.08 m, a 2.99-kg object is at +2.60 m, a 2.53-kg object is at the origin, and a 4.07-kg object is at -0.490 m. Where is the center of mass of these objects?

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Write down two additional questions about earth's magnetic field that will make your presentation more informative.