I want bf (best friend)

anyone willing​

What is hidden during a lunar eclipse? isn't the moon hidden?

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?