What are Some of the Most Common Energy Sources?

Answers

Answer 1
Answer: Worldwide, they are coal, oil, natural gas, wood, animal fat, and vegetable oils. On the world-wide scale, nuclear, wind, solar, and hydro are a piffle.
Answer 2
Answer: fossil fuels, nuclear power, hydroelectric power, wind power, and solar power.

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A _______ is a repeating disturbance or vibration that transfers or moves energy from place to place without transporting mass.force
wave
vacuum
medium
PLZ help me!

Answers

Answer: wave

Explanation:

These are the basic definitions and characteristic of the terms given, which show tha the only rigth answer is the second option: wave.

1) Force is an interaction. There are four natural forces: electrostatic, gravity, strong nuclear force and weak nuclear force.

2) Wave: is a sequence of pulses or vibrations that cause the continuous transportation of energy (propagation). There is not transport of mass, only energy.

Some examples of waves are sound waves, electromagnetic waves (light, radio waves, micro waves, infrarred waves, ultraviolet waves).

3) Vacuum: is the absence of matter; empty space. Only electromagnetic waves can travel through vacuum; other waves need a medium to travel.

4) Medium: any matter is a medium: a solid, the air, a liquid, all of them are media through which waves can transport its energy, depending of the wavelength.

A wave, waves transport energy rather than matter from one area to another.
An example of this is conduction of thermal energy, for instance when you heat up a saucepan the metal areas of the pan not touching the heat source still heat up due to waves of thermal energy (conduction)

A graph depicts force versus position. What represents the work done by the force over the given displacement?A. The work done is equal to the product of the maximum force times the maximum position.
B. The work done is equal to the area under the curve.
C. Work cannot be determined from this type of graph.
D. The work done is equal to length of the curve.
E. The work done is equal to the slope of the curve.

Answers

Work = (force) x (distance)

With a force/distance graph, the work is the area under the graph.

If the graph is curved, broken, or some other screwy shape that makes it difficult to
get the area in any simple way, then work is the integral of the function represented
by the graph.

Final answer:

The work done by a force over a given displacement, as represented in a force versus position graph, is equal to the area under the curve.

Explanation:

In a force versus position graph, the work done by the force over the given displacement is represented by the area under the curve. The work done is the integral of the force with respect to displacement which, in a graphical representation, translates to the area under the curve of the force versus position graph. For example, if the force is constant, the graph will be a rectangle, and the work done will be the product of force (height of the rectangle) and displacement (width of the rectangle). If the force is variable, the area under the curve might need to be calculated by dividing it into small sections and summing up their areas.

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Technological advances in transportation have come about in response to the depletion of fossil fuels and other negative aspects of the internal combustion engine. There are many positives to these advancements, but there are also some negatives. Which statement is a negative aspect of these advancements?A) These advancements use renewable resources like corn.
B) These advancements do not contribute to the greenhouse effect.
Eliminate
C) These advancements use cleaner fuels thereby reducing pollution.
D) These advancements are very expensive and not available to everyone.

Answers

Technical advancements in transportation are very expensive and not available to everyone.

What is technical advancements in transportation?

A revolution is currently taking place in transportation technology. While new ideas are ready to completely transform how we move, new technologies are increasing the effectiveness of existing transportation techniques.

The newest transportation revolution has seen a growth in different technologies.

  1. The Internet of Things: The Internet of Things is predicated on the idea that all objects and people can be networked together. Route planning, accident prevention, and safety can be easily taken care by using internet.
  2. Autonomous Cars:  Autonomous vehicle technology is expected to advance and eventually replace human drivers as a safer option that also has additional economic and environmental advantages.
  3. Lightweight Vehicle Materials: Moving away from cast iron and steel is the main goal of research into lightweight materials. The most likely replacements for these metals in the near future are carbon fiber construction and magnesium-aluminum alloys.

Although these modern technologies are established to be environmental friendly, These advancements are very expensive and not available to everyone. This is one among the disadvantages of  technological advances in transportation.

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Answer:

Option D

Explanation:

These advancements are very expensive and not available to everyone. The others are positive aspects of these advancements in transportation.

________ is the tendency of an object to vibrate at its natural frequency.a. Polarization
b. Refraction
c. Resonance
d. Diffraction

Answers

Resonance is the answer. Resonance frequency is the term used when an object begins to vibrate at an perferred frequency.

If light photons are massless then why are they attracted by black holes?​

Answers

Answer:

Photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them.

Explanation:

is that what you wanted?

When astronauts travel to the moon, their bodies experience a lower gravitational pull than on Earth. Which type of pull are they experiencing?

Answers

Answer:

The pull the astronauts feel in the moon will be gravitational too.

Explanation:

The pull will be gravitational too because there's a gravitational force exerted by the moon over the astronaut, this force keeps pulling the astronaut towards the moon surface but it's weaker than in earth because the mass of the moon is significantly less that the mass of the earth.

They are experiencing the pull of leaving the atmosphere