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3 years ago

1. Explain how scientific knowledge and reasoning can help us make difficult decisions.

2 answers:

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Describe the electromagnetic spectrum, electromagnetic waves, and give two examples of different types of electromagnetic waves.

sammy [17]3 years ago

5 0

Answer:

Describe a sound wave. Discuss what determines pitch and volume. A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium. It can travel through the air, water, and most liquids.The medium consists of particles that oscillate within a certain amplitude. The volume is proportional to the amplitude of the sound wave. The frequency of a sound wave is perceived as pitch.

Describe the properties of a wave. Include how longitudinal and transverse waves are alike and how they are different. Provide an example for each. The properties of a wave include amplitude, frequency, period, wavelength, and speed. The amplitude of a wave is a measure of the displacement of the wave from its rest position.The wavelength of a wave is the distance between two corresponding points on back-to-back cycles of a wave.The speed is how fast the disturbance of the wave is moving. A longitudinal wave is a wave in which the particles of matter move in a direction parallel to the motion of the wave. A transverse wave is a wave in which the particles of matter oscillate in the direction perpendicular to the motion of the wave. Longitudinal waves and transverse waves are different because transverse waves move in perpendicular direction to the source of vibration, and for longitudinal waves, the waves move in parallel direction to the source of vibration. They are both similar because energy is transferred in the form of waves. Here is an example of a longitudinal wave, waves moving along the water. Here is an example of a transverse wave, the vibrations in a guitar.

Describe the electromagnetic spectrum, electromagnetic waves, and give two examples of different types of electromagnetic waves. The electromagnetic spectrum is the range of wavelengths or frequencies over which electromagnetic radiation extends. Electromagnetic waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Here is an example of a radio wave, Cellular Networks use radio waves to get the data from the cell towers to your phone. Here is an example of an infrared wave, a glowing light bulb uses infrared waves.

Explanation:

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Which of these would not contribute to a global increase in temperature?

Katyanochek1 [597]

Answer:

planting trees - increasing the amount of animal life on earth

Explanation:

from all the other options given, all except planting trees will increase global temperature.

1. deforestation: this removes vegetative cover and the amount of oxygen in the atmosphere.

2. increasing the use of gasoline burning vehicles: burning gasoline produces carbon dioxide which is a green house gas which traps heat in the atmosphere and causes global warming

3. increasing the industrial release of carbon dioxide: carbon dioxide is released when gasoline is burned in industries, this in-turn causes global warming.

Trees produces oxygen and sucks in carbon dioxide which causes global warming. more trees mean more oxygen and less carbon dioxide which translates to less global increase in temperature

6 0

3 years ago

Object A has a mass of 100 grams. Object B has a mass of 150 grams. They are both traveling at the same velocity. What can you c

Scilla [17]

-- Momentum is (mass) x (speed).
Object B has 1.5 times as much momentum as Object A has.

-- Kinetic energy is (1/2) x (mass) x (speed) .
Object B has 1.5 times as much kinetic energy as Object A has.

-- If they would both stop long enough to get on the scale,
Object B would weigh 1.5 times as much as Object A does.

8 0

2 years ago

Friction is defined as *

den301095 [7]

Answer:

O a force that opposes motion

5 0

3 years ago

What quantities determine the resistance of a piece of material? Choose all that apply.

bija089 [108]

Answer:

Option (a), (b) and (c)

Explanation:

The resistance of a conductor depends on the length of the conductor, area of crossection of the conductor and the nature of the conductor.

The formula for the resistance is given by

R = ρ x l / A

Where, ρ is the resistivity of the conductor, l be the length of the conductor and A be the area of crossection of the conductor.

So, It depends on the length, area and the type of material.

7 0

3 years ago

Se deja caer un objeto desde la cornisa de una casa la cual tarda en llegar al suelo 645/500 segundos. ¿Cúal es la altura de la

salantis [7]

8.15m. La altura de la casa de la cual se deja caer un objeto que tarda en caer $\frac{645}{500}s$ es de 8.15m.

La clave para resolver este problema es mediante caída libre, la velocidad inicial del objeto es 0 por lo que podemos calcular la altura h de la casa mediante la relación $h= \frac{gt^{2}}{2}$ .

Conocemos la gravedad $g=9.8\frac{m}{s^{2}}$ y el tiempo en que tarda en caer el objeto $t=\frac{645}{500}s$ , sustituyendo los valores tenemos que:

$h=\frac{(9.8\frac{m}{s^{2}})(\frac{645}{500}s)^{2}}{2}=8.15m$

4 0

3 years ago