4. Intermediate conductivity and a low melting point.
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Explanation:
Red, green, and blue are therefore called additive primaries of light. ... When you block two lights, you see a shadow of the third color—for example, block the red and green lights and you get a blue shadow. If you block only one of the lights, you get a shadow whose color is a mixture of the other two.
First, your definition of a shadow is incorrect. A shadow is an area that receives less light than its surroundings because a specific source of light is blocked by whatever is "casting" the shadow. Your example of being outside reveals this. The sky and everything around you in the environment (unless you are surrounded by pitch black buildings) is sending more than enough light into your shadow, to reveal the pen to your eyes. The sky itself diffuses the sunlight everywhere, and the clouds reflect plenty of light when they are not directly in front of the Sun.
If you are indoors and have two light bulbs, you can throw two shadows at the same time, possibly of different darknesses, depending on the brightness of the light bulbs.
It can take a lot of work to get a room pitch black. One little hole or crack in some heavy window curtains can be enough to illuminate the room. There are very few perfectly dark shadows.
<span>It is traveling at 10m/s.</span>
Answer:
Explanation:
This is an exercise where you need to use the concepts of <em>free fall objects</em>
Our <u>knowable variables</u> are initial high, initial velocity and the acceleration due to gravity:
At the end of the motion, the <u><em>rock hits the ground</em></u> making the final high y=0m
If we <em>evaluate the equation</em>:
This is a classic form of <u><em>Quadratic Formula</em></u>, we can solve it using:
Since the <u><em>time can not be negative</em></u>, the <em>reasonable answer</em> is
The energy of the wave is D) 16.0 units squared
Explanation:
The energy of a wave is directly proportional to the square of the amplitude of the wave.
Mathematically, this can be written as
where
E is the energy of the wave
A is its amplitude
For the wave in this problem, the amplitude is
A = 4 units
Therefore, assuming that the constant of proportionality is 1, the energy of this wave is
units squared
Learn more about waves:
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