A ring-shaped weight with a radius of 40-cm is being spun
around its center axis for a physics demo. If experiments show that its moment of inertia is 0.4kg · m², what is the mass of the ring? m =___kg

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest