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Damm [24]
3 years ago
9

Which structure is used to focus light in a reflecting telescope?

Physics
1 answer:
Komok [63]3 years ago
5 0

Answer:

C. Concave Mirror

Explanation: A concave mirror is used to bring a light together to focus on an object, concave mirrors collects parallel rays and forms an image

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Why are oxygen and hydrogen two of the most abundant elements in living things
katen-ka-za [31]

Answer:

Oxygen and Hydrogen are the most abundant elements found in living beings because of their combination to form water together that builds the 70% of the living body, oxygen being used in respiration and Hydrogen being used to form other compounds as it has the simplest structure and least requirements to bond with other elements.

Explanation:

To build something, it's is important to start with the simplest formation and proceed to the complex ones. Same case applies on living beings. With the creation of all living bodies, two of the most abundant elements Hydrogen and Oxygen tends to volunteer in the formation of living bodies. Their simplest structure and least requirements to bond easily with other elements also make them suitable for the creation of living bodies.

Hydrogen consisting of only one proton and one neutron, easily collaborates with other elements and forms the complex compounds. Whereas, oxygen being processed under the respiration system, helps in developing important organs and compounds. And, most importantly not to forget point is that they both combine to make the significant compound of the living body i.e water. However, Carbon, Nitrogen and other traces are also present in the living beings but these two serve as the saviors of the war.

6 0
3 years ago
The graph shows a car's velocity over time. During which time period does the car have the greatest acceleration?
Oksana_A [137]

Answer:

Between 0 and 1 seconds (B)

Explanation:

The velocity of the car over time is represented by the line graphed here

the steeper the line, the greater change in velocity that occurred in a given time frame.

The steepest portion of the line is between 0-1 seconds, which means that the greatest rate of change occurred between 0-1 seconds.

(acceleration is the rate of change)

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2 years ago
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What is the speed of a car that travels 150km in 3.00 hrs?
Leto [7]
The answer is <span>50 km/hr. </span>
8 0
4 years ago
A machine can never be 100% efficient because some work is always lost due to what?
katrin [286]

A machine can never be 100% efficient because some work is always lost due to the lack of materials or equipment that would convert work by 100%. It follows the second law of entropy. The ideal engine is known as Carnot’s engine having a 100% efficiency. So far, no engine has ever gotten to 100%.

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4 years ago
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What's a similar project to the soda and mentos project?
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Pop rocks and soda..... baking soda and vinegar ...
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