Describe the meaning of the focal length of a spherical mirror.
1)The focal length is the distance between the focal point and the image.
2)The focal length is the distance between the mirror and the center of curvature.
3)The focal length is the distance between the focal point and the object.
4)The focal length is the distance between the mirror and the focal point.

4)The focal length is the distance between the mirror and the focal point.

Explanation:

Spherical mirrors are of two types which are concave mirror and convex mirror.

All this mirrors possesses focal point which is the point where all light incident on the mirror converges after reflection. This focal point is closer to the pole of the curved mirror. The length between this focal point of the curved mirror and the pole of the mirror is therefore the FOCAL LENGTH of the mirror.

a. carbon monoxide from car exhaust

b.particulate matter, such as soot

c.water vapor from a factory smokestack

d.acid rain

these are the answer choices im on that question right now

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.