Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 458 km above the surface of the Moon, where the acceleration due to gravity is 1.05 m/s^2. The radius of the Moon is 1.70 ✕ 10^6 m. Determine:

a. The astronaut’s orbital speed.
b. The period of the orbit.

Need in all of themmm only answer if you know pls

Frequency of electromagnetic waves that a radio station is assigned is called

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?