Question

1. (a) what is the main source of energy for earth? (b) what evidence supports that? 2. (a) what kind of light is shown in figure 1? (b) what similarities and differences exist between this kind of light and the kind of light in your home? 3. hold your hand just above a sheet of paper. (a) what happens to the shadow as you move your hand closer to the paper? (b) how does the shadow change as you move your hand further away from the paper? why does this happen? 4. (a) you are wearing a t - shirt with writing on it. how does the writing appear when you look at the t - shirt in a mirror? (b) how is the writing on this ambulance (figure 2) similar to what you saw looking at your t - shirt in the mirror? 5. funhouse mirrors are curved mirrors. describe some of the different shapes your body might have in a funhouse mirror. 6. (a) what physical shape does a security mirror in a store have (figure 3)? (b) in such a mirror, is your appearance - larger or smaller? - upside down or right side up? - backwards? 7. (a) describe the appearance of a straw in a glass of water when you look at it from above (figure 4). (b) what do you think causes this unusual appearance?

Explanation:

1.

Step1: Identify main energy source

The sun is the main source of energy for Earth. It provides light and heat through solar radiation which drives many Earth - system processes like photosynthesis, weather patterns, etc.

Step2: Evidence for the sun as energy source

Plants use sunlight for photosynthesis to make food. Solar energy also drives the water cycle, and the wind is caused in part by uneven heating of the Earth's surface by the sun.

Step1: Identify the type of light in Figure 1

The light in Figure 1 (the neon "OPEN" sign) is artificial light. Neon lights work by passing an electric current through a gas (neon) which emits light.

Step2: Compare with home light

Similarities: Both are artificial light sources. Differences: Neon lights are often used for signage and have a distinct, bright color and glow, while home lights (like incandescent, LED) can be used for general illumination and come in a wider range of colors and intensities.

Step1: Effect when hand is closer to paper

As you move your hand closer to the paper, the shadow becomes smaller and sharper. This is because the light source appears larger relative to the hand - paper distance, causing less penumbra (the fuzzy part of the shadow).

Step2: Effect when hand is further from paper

As you move your hand further away from the paper, the shadow becomes larger and fuzzier. This is because the light rays spread out more as the distance between the hand and the paper increases, creating a larger penumbra.

Answer:

(a) The sun is the main source of energy for Earth. (b) Evidence includes photosynthesis in plants, the water - cycle, and wind formation due to solar heating.

2.