A person 1.8m tall stands 0.75m from a reflecting globe in a garden. PART A If the diameter of the globe is 16cm , where is the image of the person, relative to the surface of the globe?
PART B How large is the person's image?

1. The image of the person is 1.41 m, virtual and formed at the back of the surface of the globe.

2. The person's image is 3.38 m tall.

Explanation:

From the given question, object distance, u = 0.75 m, object height = 1.8 m, radius of curvature of the reflecting globe, r = 8 cm = 0.08 m.

f = = = 0.04 m

1. The image distance, v, can be determined by applying mirror formula:

= +

= +

- =

=

  = -

⇒ v = -

      = - 1.41 m

The image of the person is 1.41 m, virtual and formed at the back of the surface of the globe.

2.   =

  =

v =

  = 3.384

v = 3.38 m

The person's image is 3.38 m tall.

the total distance traveled by the car is

30km + 49km = 79 km .

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.