An experiment begins with crystalline salt at the bottom of an otherwise empty glass. first, students add water to the glass. then they mix the solution until the salt crystals dissolve completely. rate the entropy of the water-salt system during this process from highest entropy to lowest entropy. group of answer choices

a. the entropy of the system shortly after mixing begins > the entropy of the system after the salt dissolves completely > the entropy of the system right after adding the water
b. the entropy of the system after the salt dissolves completely > the entropy of the system shortly after mixing begins > the entropy of the system right after adding the water
c. the entropy of the system right after adding the water > the entropy of the system shortly after mixing begins > the entropy of the system after the salt dissolves completely
d. the entropy of the system after the salt dissolves completely > the entropy of the system right after adding the water > the entropy of the system shortly after mixing begins
e. the entropy of the system shortly after mixing begins > the entropy of the system right after adding the water > the entropy of the system after the salt dissolves completely
f. the entropy of the system right after adding the water > the entropy of the system after the salt dissolves completely > the entropy of the system shortly after mixing begins

Follow these directions and answer the questions. 1. shine a pencil-thin beam of light on a mirror perpendicular to its surface. (if you don't have a laser light as suggested in the video, you can make a narrow beam from a flashlight by making a cone from black construction paper and taping it over the face of the flashlight.) how does the light reflect? how does the relationship of incident to reflected ray relate to the reflection of water waves moving perpendicular to a barrier? 2. shine a pencil-thin beam of light on a mirror standing on a sheet of paper on the table (or floor) so that you can mark the incident ray and reflected ray. (you can support the mirror from the back by taping it to a wooden block.) 3. mark a line on the paper representing the reflective surface. (the reflective surface of a mirror is usually the back edge.) 4. draw a dashed line perpendicular to the mirror surface at a point where the incident and reflected ray meet. this perpendicular is called a normal to the surface. 5. measure the angles between the rays and the normal. the angle of incidence is the angle formed by the incident ray and the normal to the surface. the angle formed by the reflected ray and normal is called the angle of reflection (r). what is the angle of incidence? what is the angle of reflection? 6. repeat for several different angles. (see report sheet for details.) what appears to be the relationship between the angle of incidence and angle of reflection? in science 1204, what was the relationship for these two angles made by the reflection of waves in a ripple tank? 7. roll a ball bearing so that it hits a fixed, hard surface (a metal plate) at several angles (including head-on). observe the way in which the ball bearing reflects. what generalization can you make about how a ball bearing reflects from a wall? have you proved that light can only behave like a wave?

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?