[13] When a parachutist first jumps out of a perfectly good airplane, there is e

Question

[13] When a parachutist first jumps out of a perfectly good airplane, there is essentially no cross-sectional area that the parachute provides. Once the parachute opens, there is a huge increase in cross-sectional from the parachute, and that slows the parachutist's rate of fall. a. Right after the parachutist jumps out of the perfectly good airplane, what direction (up or down) is the parachutist's velocity? b. Right after the parachutist jumps out of the perfectly good airplane, what direction (up or down) is the parachutist's acceleration? c. Right after his parachute opens, in what direction (up or down) is the parachutist’s velocity? d. Right after his parachute opens, in what direction (up or down) is the parachutist’s acceleration? [14] What is the difference between “fission” and “fusion” nuclear reactions? Is an operating nuclear reactor an example of a sub-critical, critical, or super-critical nuclear reaction? Is a nuclear explosion an example of a sub-critical, critical, or super-critical nuclear reaction? [15] How is lightning created? How is thunder created? Which physically occurs first, lightning or thunder? Which is “sensed” first, lightning or thunder? Explain your answers. [16] What was the most interesting part of this course? What was the least interesting part of this course? Explain.

Explanation / Answer

13.

(a) Up.

(b) Down.

(c) Up.

(d) Up.

fission:heavy nucleus devides into smaller nucleus with releasing some energy.

fusion:forming of heavier Nuclear by adding two or more than number of nuclei.

nuclear reactor:-------- sub critial.

nuclear explosion:------super crictical.

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