半径が一定の速度で減少する円運動の様子を問う力学の問題がわかりません

2 on a frictionless table goes round in a circle on a light string that passes through a e 85 Shown. Initially the mass is a distance 7。 from the centre and is turning With のThe string is pulled with a constant velocity starting at ime だ0, so that ce to the mass decreases with time. 『 の and then show that for //r2、 の=4 の0.

（設問）This passage is most likely to have appear in （an introduction to a collection of stories.） っていうのは この文章はストーリーの収集の導入であらわれるような可能性が最も高い... Read More

An American professor who teaches Contracts made the following statement: “Traditionally, punitive damages have not been available for b... Read More

これを英文にできる方いませんか？？

超バカですけど三年生から頑張ったら国公立大学にいけますかね？？(>_<)