evokeclass11

When is the maximum distance between the Sun and the Earth?

Who is the best scientist  🧐 for you? 

(a) A luminous point is moving at speed   toward a spherical mirror with radius of curvature r, along the central axis of the mirror. Show that the image of this point is moving at speed

 Where p is the distance of the luminous point from the mirror at any given time. Now assume the mirror is concave, with r = 15 cm, and let . Find  

when (b) p = 40 cm (far outside the focal point), (c) p = 7.8 cm (just outside the focal point), and (d) p = 10 mm (very near the mirror).

Consider a small system that is interacting with a reservoir at temperature 400 K, pressure 108 Pa, and chemical potential ‒0.3 eV.

(a) To go from state 1 to state 2, the small system must take an additional 0.03 eV of energy and 10‒29 m3 of volume from the reservoir. How many times more probable is it for the small system to be in state 1 than state 2?

(b) To go from state 1 to state 3 the small system must take 0.4 eV of energy and one particle (but no extra volume) from the reservoir. How many times more probable is it that the small system is in state 1 than state 3?

(c) To go from state 1 to state 4, the small system must take no energy but one particle and 10‒27 m3 of volume from the reservoir. How many times more probable is it that the small system is in state 1 than state 4?

introduction to firewalls