18. AB and CD, two spherical mirrors form parts of a hollow spherical ball with its centre at 0,
as shown in the diagram. If arc AB = arc CD, What is the ratio of their focal lengths? State
which of the two mirrors will always form virtual image of an object placed in front of it and
why?

Astate of matter all that has define volume and can flow is a(n)

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.