A student sets up a box with a flashlight that shines on a mirror located at position X. Other possible locations for objects in the box are labeled A-E. How can the student place objects in the box to have all the light from the flashlight shine back on the flashlight?

If all the objects are placed at the same angle.

Explanation:

If all the objects are placed at the same angle so all the light from the flashlight shine comes back to the flashlight. If the A object is placed at the specific location at which the mirror X reflects the light after hitting it, then the other E object is placed at the location where the light comes after reflecting the A object then the light comes back to the flashlight if the angle between objects placement is right.

d

Explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)