In Lesson 4.1, you learned that the machine used to fuel missions to Titan is not making enough liquid oxygen. We are waiting for a more detailed report from the Universal Space Agency. Before we receive the report, however—and now that you know how the liquid oxygen machine is supposed to work—what are some ideas you have about what could be causing it to malfunction?

Answer:- False

Explanation:-

False because it can leads to overloading and further to short circut.

Number two because the sun emits heat in the form of light to earth

Answer: #2 (Heat energy and light energy both can come from the sun.

Explanation:

The hydrogen-oxygen reaction produces enormous heat, causing water vapour to expand and leave the engine nozzles at speeds of up to 10,000 miles per hour by using liquid nitrogen.

The movement of liquid oxygen from one container to another can result in the formation of an oxygen-enriched atmosphere in the area of the containers. When a liquid oxygen container is not used for an extended period of time, a small quantity of oxygen is vented into the surrounding area. When the container is tipped over or put on its side, more oxygen is vented. If the container is stored in a confined area, this venting may result in an oxygen-enriched atmosphere.

Rockets generate thrust by rapidly expelling material rearward. The thrust generated can be calculated by multiplying the propellants' mass flow rate by their exhaust velocity relative to the rocket. (specific impulse). A rocket is accelerated by the weight of combusting gases against the combustion chamber and nozzle, rather than by "pushing" against the air behind or below it. Because of the lack of air pressure on the outside of the engine, rocket engines work best in space. It is also possible to accommodate a longer nozzle in space without experiencing flow separation.

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Answer:

3.James Watson, Francis Crick, Maurice Wilkins, and Rosalind Franklin. These four scientists—Watson, Crick, Franklin, and Wilkins—codiscovered the double-helix structure of DNA, which formed the basis for modern biotechnology.

4.

Watson and Crick contributed the first model of the 3d structure of DNA that was correct in its essential features. The 3d structure of a biological molecule is important because it can explain how it carries out its function. DNA was known to be a very important biological molecule, because it had been established as the primary constituent of the genetic material that is inherited from parent to child. The Watson and Crick model suggested how the genetic material carried out its function.

The most important feature of the model was the suggestion of base-pairing via hydrogen bonds between Adenine and Thymine on one hand, and Cytosine and Guanine on the other hand. This base pairing scheme suggested how DNA may copy itself - an essential requirement of the genetic material.

Critically, their model wasn't just a speculative clever idea. It also accounted for known data. Among this was Erwin Chargaff's base ratios, Rosalind Franklin's X-ray data, and known facts of chemical bonding. This made it plausible.

The Watson and Crick DNA model offered a solution, at least in outline, to one of the deepest mysteries of biology - how does the genetic material achieve inheritance at the molecular level. It also opened up a possible line of attack to another deep mystery - how the genetic material determine the traits of organisms by specifying the synthesis of proteins, also known as the coding problem.

5.

Image result for 5 what was the significance of the work of these scientist who created the dna structure

Rosalind Franklin discovered the density of DNA and, more importantly, established that the molecule existed in a helical conformation. Her work to make clearer X-ray patterns of DNA molecules laid the foundation for James Watson and Francis Crick's suggestion that DNA is a double-helix polymer in 1953.