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物理 高校生

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空気の抵抗は JK=0 U=mgh 例題2 ばねと力学的エネルギーの保存 軽いばねの一端を天井に固定し, 他端に質量mの物体をつるすと, ばねは自然長からだけ伸びてつり合った。 この物体を, ばねの自然長の位置まで手で持ち上げて、静かに手をはなした。 重力加速度の大きさをgとし, 重力による位置エネルギー の基準面は、ばねの自然長の位置にとるものとする。 (1)このばねのばね定数を求めよ。 (2)ばねの自然長からの伸びがxになる点を通過するときの物体の速さがであるとする。このときと手をはなした直後で, 力学的エネルギーは保存される。 力学的エネルギー保存の式を書け。 (3)つり合いの位置を通過するときの物体の速さを求めよ。 (4) 物体が最下点に達するときのばねの伸びを求めよ。 解説 (1)このばねのばね定数をkとすると,図のBのときの 物体にはたらく力のつり合いより, B mg mg = kl よって,k= -12 mul = 0 になるため (2)図のAとCについて考え,k= 0+0+0= 1 2 m² mỏ – mgx + (3) 図のCについて, x=1として,(2)の式に代入すると, mgを を代入すると, 0000000 自然長 0 mg x² 21 K=0 つり合いの U = 0 + 0 位置 kl 00000000 Beet K=1/2m02 U=-mgl+1/k12 CK=1/23 mv2 U= mgx+1/2/kx2 0=1/2m² -mv²- mgl + -mgl 2 Vo mg x さは基準 となる。 v>0, v=√gl (4)図のDについて,求めるばねの伸びをひとすると, 最下点でv = 0 だから,(2)の式に代入すると, 最下点 K = 0 U= -mgl' + kl² 0 = - mgl' + mg_ 91,2 l' ≠ 0 だから, l'=21 21

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英語 高校生

7行目の文の文構造教えて欲しいです🙏

25 The Maya loved cacao so much they used the beans as currency. They also believed it is good for you which many people still say today about cacao's most famous byproduct, chocolate. 物 In fact, cacao, also called cocoa, which is the not-so-secret ingredient of chocolate, s contains hundreds of bioactive* plant compounds, including flavanols*, which have with numerous possible health benefits. been (あ "Research on the bioactive components of the cacao bean pretty consistently shows that if you're consuming greater amounts of flavanols you see mechanisms (linked to heart disease are, by and large, favorably impacted," says Howard Sesso, an 10 epidemiologist at the Harvard T.H. Chan School of Public Health and Brigham and Women's Hospital. This includes improvements in blood pressure and cholesterol levels. But while cacao does have intriguing potential to boost heart health and brain function, no science supports eating large amounts of chocolate as a health food 15 sorry chocoholics. Here's why. - Spurred by chocolate's popularity, numerous studies have explored how the natural chemical compounds found in cocoa might be good for human health. While some have suggested that less than an ounce of dark chocolate might 本単位 VT improve heart health, much of the research doesn't involve eating actual chocolate not A but rather BAというよりむしろB 20 but rather its components. In 2022, (2) Sesso and colleagues found compelling evidence for the benefits of 説得力のある flavanols. In a clinical trial of 21,000 adults, they found that the half of the group that took 500mg of cocoa flavanol supplements daily had a significantly lower risk of death from cardiovascular disease* than those who had taken a placebo. Flavanols may also boost insulin sensitivity, according to some studies, which might be helpful in reducing the risk of type 2 diabetes. But the results aren't conclusive, and those at risk of diabetes might be () (to choose a cacao-inspired

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英語 高校生

適切な記号を選ぶ問題です どなたか教えていただきたいです 宿題でわからなくてら困ってます🤦 答えがないんです

) in Australia. 1 Portuguese ( P is spoken 2 Kangaroos ( ) in Brazil. 1 is speaking " speaks I spoke P can be found 1 are founded " can found I are can found 3 I was spoken ( 7 by 1 to ウ by to I to by 4 The song ( ) a pretty girl yesterday. ) by people all over the world for many years. 7 has loved 1 has been loved ウ loved I is loving 5 Ann's birthday cake ( ) by her mother now. is being made 1 is being making is making I has made 6 We ( ) our new school uniform. 7 satisfy with be satisfied with are satisfied with " are satisfied to I satisfy 7 She was made ( ) overtime by her boss. 7 work 1 be worked to be worked I to work 8 このあたりのどの木も切らせてはいけない。 Don't let any trees around here ( ). 7 cut down 1 to cut down " cutting down I be cut down 9 The man was seen ( ) out of the house. I go to go ウ gone I went 10 Visitors are ( ) to beware of the pickpockets. 7 advised 1 informed 11 David had his car ( 7 being checked 12 This word ( 7 is pronounced 13 Many people ( I had died 14 They were ( 7 amaze 1 15 The girl was ( 7 brought " noticed I advanced ) by a mechanic. 1 checked " checking I was checked ) with the stress on the first syllable. 1 is pronouncing " pronounces ) in the Hanshin earthquake of 1995. 1 killed " were dead I were killed ) at the singer's fantastic voice. amazed amazing I amazed I pronounce be killed in ) up by her kind aunt after her parents died. 1 carried given I grown

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