The temperature of air in a flow is 725°R. Calculate the speed of sound. 2. The temperature in the reservoir of a supersonic wind tunnel is 625°R. In the test section, the flow velocity is 1835 ft/s. Assuming adiabatic flow, what is the Mach Number in the test section? 3. Assume isentropic flow through a supersonic nozzle. The test-section conditions are p = 2.25 atm, T = 205K, and M = 1.65. What are the reservoir pressure and temperature values? 4. A point in a compressible flow has the following properties: T = 245K, V = 275 m/s, and p = 1.85 atm. At this point, calculate the values of po, To, p* , T* , and M* .

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.