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24 tháng 9 2021

Tình cảm của người Tây Nguyên với cô giáo, với cái chữ nói lên nguyện vọng tha thiết muốn học chữ để hiểu biết hơn, thoát khỏi cái dốt, cái lạc hậu. Có được cái chữ sẽ mở mang được trí tuệ, tiếp nhận được khoa học kĩ thuật, nhờ đó mà thoát được cái nghèo, cái lạc hậu, buôn làng được ấm no, hạnh phúc.

24 tháng 9 2021

tình cảm của người tây nguyên đối với cô giáo rất coi trọng, thân thiện, dễ mến

24 tháng 9 2021

Thời gian đã chuyển dần sang chiều, ánh mắt trời nhanh chóng bị che khuất, bầu trời trong xanh bỗng nhường chỗ cho những đám mây đen từ phía chân trời kéo lại. Những cơn gió mát mùa hạ cũng ngừng thổi, tiếng sấm chớp vang đến dồn dập hơn như báo hiệu cơn mưa dông đang đến rất gần.

Những đám mây lớn, nặng bao phủ cả bầu trời. Cơn gió lành lạnh thổi qua mang theo vài hạt mưa. Mưa bắt đầu rơi lộp bộp trước sân nhà. Tiếng sấm, tiếng sét ngày càng vang lên dữ dội. Mưa bắt đầu tăng dần, mưa tới tấp, ào ào, nổi trên mặt sân, cây cối ngả nghiêng trong gió. Đàn gà đang thong dong ngoài vườn kiếm mồi vội vàng trú ẩn dưới những gốc cây tránh mưa, những chú gà nhanh chân hơn đã kịp chạy về chuồng trú ẩn.

Ngoài đồng, các bác nông dân đang đội nón và khoác chiếc áo mưa, khơi thông dòng nước chảy để tránh ngập úng cũng đám ruộng mới gieo trồng. Mưa có lẽ là niềm vui thích nhất của lũ trẻ chúng em, lũ bạn đang í ới gọi nhau ra tắm mưa và đá bóng nên nền sân gạch sạch sẽ. Bất giác giơ tay ra hứng những giọt nước mưa nặng hạt, ran rát nhưng mát lạnh, có cái gì tươi mới dường như cũng trỗi dậy trong em.

Mưa đang ào ạt, bỗng thưa dần rồi tạnh hẳn. Ánh nắng mặt trời vàng óng chan hòa xuống khắp làng quê. Hạt mưa còn đọng lại trên cánh hoa, lá trong veo như hạt ngọc. Bầu trời quang đãng, mát mẻ, vườn cây rung rinh trong gió nhẹ, những chiếc lá sạch bóng, xanh mát như vừa được tắm gội sạch sẽ. Đàn gà trú ẩn dưới gốc cây vỗ đôi cánh để rơi những giọt nước nhỏ còn đọng trên đôi cánh, rồi tiếp tục tìm mồi. Trên con đường làng, mọi người tấp nập đi lại, tiếng xe cộ rộn vang.

Mùa hè đến cùng với những cơn mưa mùa hạ tinh nghịch thích đến, thích đi mà không báo trước. Cơn mưa mang đến nguồn nước quý giá cho cây cối, ruộng đồng, mang đến cả niềm vui cho con người. Và cầu vồng xuất hiện phía chân trời xa xa kia như lời chào tạm biệt đẹp đẽ nhất đến với thế gian mà những cơn mưa rào mùa hạ vội vã vẫn kịp để lại.

II. BÀI TẬP VẬN DỤNGCâu 1:       Trên hình vẽ một tia sáng SI chiếu lên một gương phẳng. góc tạo bới tia SI với mặt gương phẳng bằng 300a.       Hãy vẽ tiếp tia phản xạb.      Tính góc phản...
Đọc tiếp

II. BÀI TẬP VẬN DỤNG

Câu 1:       Trên hình vẽ một tia sáng SI chiếu lên một gương phẳng. góc tạo bới tia SI với mặt gương phẳng bằng 300

a.       Hãy vẽ tiếp tia phản xạ

b.      Tính góc phản xạ

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Câu 2:       02_19Chiếu một tia sáng SI lên một gương phẳng

a.       Vẽ tia phản xạ

b.      Vẽ một vị trí đặt gương để thu được tia phản xạ theo phương nằm ngang từ trái sang phải.

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Câu 3:       Cho 3 chùm tia hội tụ, phân kì, song song lần lượt được chiếu vào gương phẳng (M). Vẽ hình mỗi trường hợp. Dựa vào hình vẽ này, ta có thể rút ra những kết luận gì?

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Câu 4:       Một gương phẳng đặt trên mặt bàn nằm ngang, gần một bức tường thẳng đứng. Dùng đèn pin chiếu một tia sáng lên gương sao cho tia phản xạ gặp bức tường. Hãy vẽ hai tia tới cho hai tia phản xạ gặp bức tường ở cùng một điểm M.

03_19.........................................................................................................................................................................

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Câu 5:       Cho gương phẳng (M), tia sáng tới SI đến gương với góc i = 500.

a.       Tính góc hợp bởi tia phản xạ và gương phẳng (M)

b.      Nếu góc tới i = 00, góc phản xạ là bao nhiêu? Từ đó rút ra kết luận gì?

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Câu 6:       Cho các hình a, b, c, d hãy:

1.      Vẽ các tia phản xạ (hoặc tia tới)

2.      Xác định độ lớn của góc tới i (hoặc góc phản xạ i’)

04_20

 

 

 

 

 

 

 

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Câu 7:       Cho các hình vẽ sau, biết I là điểm tới, SI là tia sáng truyền tới gương phẳng, IR là tia phản xạ trên gương. Hãy:

1.      05_20Vẽ pháp tuyến với gương tại điểm tới

2.      Xác định vị trí của gương

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7
24 tháng 9 2021

uk bạn

24 tháng 9 2021

giúp mình với

24 tháng 9 2021

?? Vật lý lớp 6??

24 tháng 9 2021

Kính lúp là dụng cụ quang học bổ trợ cho mắt để quan sát các vật nhỏ.

Kính lúp được cấu tạo bởi một thấu kính hội tụ (hay một hệ ghép tương đương với một thấu kính hội tụ) có tiêu cự nhỏ (vài centimét).

Kính lúp là dụng cụ quang học bổ trợ cho mắt để quan sát các vật nhỏ. Kính lúp được cấu tạo bởi một thấu kính hội tụ (hay một hệ ghép tương đương với một thấu kính hội tụ) có tiêu cự nhỏ (vài centimét).

Công thức tính số bội giác của kính lúp : \(G=\frac{\tan a}{\tan a_o}\)

# Hok tốt ( Câu kia mik chưa làm đc )

DS
24 tháng 9 2021

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24 tháng 9 2021

R1 = 2 ôm; R2 = 6 ôm mắc song song thì Rtd = (R1.R2)/(R1 + R2) = (2.6)/(2 + 6) = 12/8 = 1,5ôm

U = 9V

Khi đó I toàn mạch là I = U/R = 9/1,5= 6A

Đáp án:

 I = 6A

Giải thích các bước giải:

 R1 = 2 ôm; R2 = 6 ôm mắc song song thì Rtd = (R1.R2)/(R1 + R2) = \(\frac{2.6}{2+6}\) = \(\frac{12}{8}\) = \(1,5\)ôm

U = 9V

Khi đó I toàn mạch là I = \(\frac{U}{R}\) = \(\frac{9}{1,5}\)= 6A

24 tháng 9 2021

Làm gay

Làm đũy

Chuyển giới

THẢ THÍNH

@Cỏ

#Forever

24 tháng 9 2021

dễ ồm nhưng mik hok bt nha 

HT

24 tháng 9 2021

mình ko có vip vẫn làm bài đc mà

24 tháng 9 2021

vào phần học bài :D

24 tháng 9 2021

tất nhiên là ko rồi

24 tháng 9 2021

không rồi