How many lightyears away is the farthest panet in another galaxy

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Aregular polygon has angkes of size 150° each.how many side has the polygon