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英語 高校生

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FPNIVeManee Network and NASA woilk togetlner to keep track of the largest pieces efspace jank、 When the shuttle is in obit、 for exmnple (heir attention ja on nearby junk that might SS mthe way Ifthe Seven asmallchanee ofa collis ion, then the shuttle speeds up while changing dnecton、 Theyw ane about 1S.000 pieces of garbage lger (ham four inches。 The Space Surveilance pieces、 With dozems of telescopes and antennas on the Earth and in ーー Network トeeps a list of all these Becawse all the piecesare in motion allthe time, keeping track ofthem is di仙cult. SDace towatch them. gS: where the garbage is now, and where is going to be in the The sientists have to know tyo thin The prediction ofdinection js not simple because the junk can move north or south. east or west。 futune、 They ane always looking about four days into the future, tracking objects which mmight and up or down. come close. Scientists cannot Keep track of them al however. Instead ofwatching each piece one by one. scientists watch one area of SKy and count the number of pieces that pass overhead. With that Small measurement,they can use a computer program to get a good idea ofwhat the whole sky looks hike. Researchers pay Hittle attention to small pieces of space junk even when they have high possibihhty o colhsion. イ What makes tracking pieces of space junk dificult is the fact that they are always moving around. "The fture position of space junk is far more important than the current position of 直. だ tjsinmpossible for scientists to track all pieces of Space junki so they dont watch 1 オオ Now that scientists can use a computer Dora they dont have to ノ eyeS.

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物理 大学生・専門学校生・社会人

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【1 】As shown in Figure 1, here ame an object Aof mass AZ B ofmass 7 and Cof mass r On a smooth and horizontal surfce. A and B mre inlerconnected by a spring. The Spring has the naumi lcngth of / and a spring constant た A。 B, and C are on one straight Hime and can move along the stmight line. Tuke the right direction as positive fbr velocity Neglect the mass of the spring and air resistanee 国1に示すように, 水平でなめらかな台の上に質量 /の2つの物体 A, Bと質 基wの物体Cが静止している、A と Bはばね定数たで自然散7 のばねで結ばれ てでいるAB,Cは一直線上にあり, この直線上のを動くものとする. 速度の 向きは図の右向きを正にとるものとする. ばねの質基と空気抵抗は無視できる. (①) A and B are oscillated symmetically so ss for center of mass of A and B imtereonnccted by a spdng to be fixed. Find 7, the Gimc pcriod of the oscillgtion. ばねで千ばれた A と B の重心動かないように, A とB の重心に関して左右対 -称に振動させた場合の周期了を求めよ. Next A and B are atrest. The length of the spring is the natural length / で moving speed yo collides perfect-elastically with A. It is assumed that A and C are rigid, the coHlision occurs very shortly and the displacement during the colision is neglected Moreover iis also assumed tbat after the collision。 A snd C do not have nother の 次に, A と B をばねの長さが自然長 7 になる位置で静止させて, C を左から y の速度で A に衝突させる. この衝突は完全弾性衝突であり, かつ物体が非常に かたくて衝突は極めて短時間に行われ, 衝突中の変位の大きさは無視できるも のとする. さらに, Aと Cは一度笑突した後再びぶつからないものとする- の Find tie velociies yand ycofAand Cimmediaedy Ner he colison。 respectiweiy 衝突直後の A と C の速度w vcを求めよ. ⑬) Find the velocity yoof the cemlerofmassofAand B using が6 and ye 衝後の A と B の重心の束度woを44を用いて表せ (④ Find mc minimum lengtb ofthe pcng sferthe colision ing ヶ。 4 we かた 衝突後, Aと B が最も近接したときのばねの長さを ヵ, 7 w。 4を用いて表せ。 も Hi

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