A hoop has mass and radius of 4 kg and 0.37 m, respectively. The hoop start from rest and has a constant angular acceleration with respect to a rotational axis that is perpendicular to the plane of the hoop at its center. The hoop turns through an angle of 16 rad in 6.3 s. Find the net external torque that acts on the hoop.

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.

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Which changes of state do the labels represent? a: b: c: