Đáp án:F = 40N
Giải thích các bước giải:
Đáp án:
F = 40N
Độ lớn của lực F là:
$\begin{array}{l}{A_{tp}} = {A_F} - {F_{ms}}\\ \Leftrightarrow {A_{tp}} = F.s.\cos {60^o} - {F_{ms}}.s\\ \Leftrightarrow 30 = F.3.\cos {60^o} - 10.3\\ \Leftrightarrow F = 40N\end{array}$
Nhanh nhất có thể ạ :< Thu gọn các biểu thức sau:
Bài 9: Số học sinh lớp 6 của Quận 11 khoảng từ 4000 đến 4500 em khi xếp thành hàng 22 hoặc 24 hoặc 32 thì đều dư 4 em. Hỏi Quận 11 có bao nhiêu học sinh khối 6?
4. People say that he beats his wife---It is …………………………………..……………………………….. 5. It is believed that the man escaped in a stolen car--The man is …………………………………………….. 4. People say that he beats his wife--It is ……………………………..……………………………………….. 5. It is believed that the man escaped in a stolen car--The man is …………………………………………….. 7. Thanks to his aunt’s legacy of $10,000 he was able to buy the house he wanted Had it …………………………………………………………………………………….. 1. Her grief was so great that she almost fainted---So ………………………………………………………. 2. He got down to writing the letter as soon as he returned from his walk. No sooner ………………………………………………………………… 3. She just had time to put up her umbrella before the rain came down in torrents. No sooner …………………………………………………………………………… 1. We can’t afford to buy the car The car ……………………………………………………….. 2. His briefcase was too full for the zip fastener to close properly His briefcase was so ……………………………………………………… 3. It is such a marvelous opportunity that we mustn’t miss it. The ……………………………………………………… 4. Their dog was so fierce that nobody would visit them. They ………………………………………………………….. 5. She wore a hearing-aid, even though she could hear the phone ring perfectly well. She wasn’t so …………………………………………………………………….. 1. John began playing the piano ten years ago--John has …………………………………………………….. 2. She bought that house in 1990---She has …………………………………………..………………………… 3. They last visited me five years ago---They haven’t ………………………………………..………………… 4. The last time it snowed here was six years ago---It ……………....………………………………………….. 5. I haven’t been to a cricket match for years.---It’s ………………………………………….………………… 2. “If I were you, I wouldn’t trust David,” she told John She advised ………………………………………………………………… 3. “I’m sorry that I broke the glass,” said Angela-Angela apologized ………………………………………… 4. “You were cheating,” said Carol to June.---Carol accused ……………….…………………………………. 9. “You should have waited for us,” the team leader said to John. The team leader criticized …………………………………………………………… 10. I only recognized him when he came into light.-Not until ………………………………………………… 11. The workers only called off the strike after a new pay offer. Only after ………………………………………………………………………… 13. The only thing that prevented the passing of the bill was the death of the Prime Minister Had it …………………………………………………………………………………………………
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