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TL
1 tháng 12 2019
a, Khi vật cân bằng => có 2 lực cân bằng tác dụng lên vật : trọng lượng của vật và lực kéo của lò xo .
b. Muốn biết độ lớn trọng lượng của vật này thì cần dùng dụng cụ là lực kế. Nếu ko có lực kế thì tính trọng lượng của vật bằng cách lấy khối lượng của vật tính theo kilogam nhân 10 ( m = 10. P )
c. Muốn tính thể tích của vật bằng cách đo bằng bình chia độ , bình tràn, tính bằng công thức
...
25 tháng 9 2018
Vật Lí hả bạn
OK,có những dụng cụ đo như là:thước kẻ,thước mét,thước dây,v.v
17 tháng 10 2018
a. Dụng cụ: Ngoài bình chia độ đã cho để đo được thể tích của hòn đá cần thêm bình tràn và nước.
b. Cách xác định thể tích của hòn đá:
Học sinh có thể trình bày được một trong các cách khác nhau để đo thể tích của hòn đá,
ví dụ:
+ Cách 1: Đặt bình chia độ dưới bình tràn sao cho nước tràn được từ bình tràn vào bình chia độ. Thả hòn đá vào bình tràn để nước tràn từ bình tràn sang bình chia độ. Thể tích nước tràn từ bình tràn sang bình chia độ bằng thể tích của hòn đá.
+ Cách 2: Đổ nước vào đầy bình tràn, đổ nước từ bình tràn sang bình chia độ. Thả hòn đá vào bình tràn, đổ nước từ bình chia độ vào đầy bình tràn. Thể tích nước còn lại trong bình là thể tích của hòn đá.
+ Cách 3: Bỏ hòn đá vào bình tràn, đổ nước vào đầy bình tràn. Lấy hòn đá ra. Đổ nước từ bình chia độ đang chứa một thể tích nước đã biết vào bình tràn cho đến khi bình tràn đầy nước. Thể tích nước giảm đi trong bình chia độ bằng thể tích hòn đá.
17 tháng 10 2018
a, 2 : Bình tràn và Bình chứa
b, 1. Đổ 1 lượng nước nhất đinh đến mép miệng
2. Bỏ đá cuội vào sao cho chìm hẳn xuống bình . Lúc này thể tích chạy sang bình chưa
3. Ta lấy nước trong bình chứa đổ vào bình chia độ là ra thể tích hòn đá cuội
PT
4
KN
18 tháng 6 2020
có 2 loại ròng rọc
ròng rọc cố định giúp làm thay đổi của lực kéo so với khi kéo trực tiếp
ròng rọc động giúp làm lực kéo vật lên nhỏ hưn tronhgj lượng của vật
dùng palăng cho phép giảm giảm cường độ lực kéo
21 tháng 6 2020
mày ko thoát dược đâu con trai to be 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mà thôi
23 tháng 12 2019
bạn lên
https://vietjack.com/giai-bai-tap-cong-nghe-6/index.jsp
mà tìm
k mình nha
BH
17 tháng 1 2023
tham khảo:
Nắng là một hiện tượng thiên nhiên có nhiều lợi ích như: đem lại cho con người sự thoải mái, dễ chịu, nắng làm khô quần áo, chăn, màn, làm khô thực phẩm để bảo quản được laua như: lạc, vừng, ngô, gạo…Nhưng ngược lại nếu như trời quá nắng và kéo dài sẽ gây ra cho con người sự nóng bức khó chịu và dẫn đến thiếu nước cho cuộc sống sinh hoạt, lao động sản xuất, gây hạn hán, cháy rừng…khi ra ngoài trời nắng chúng mình phải đội mũ, nón không sẽ bị ốm nhé!
Mưa là 1 hiện tượng thiên nhiên cũng đem lại lợi ích cho cuộc sống con người: Cung cấp nước cho ăn, uống, sinh hoạt, lao động sản xuất…làm cho cây cối xanh tươi, đâm chồi nảy lộc. Nhưng nếu mưa nhiều sẽ cũng dẫn đến nhiều hậu quả nghiêm trọng: lũ lụt gây chết người, vật, phá hỏng nhiều công trình…
M.N ui, Trang này hiện nay đang bị lỗi rồi T-T, điển hình như các lỗi sau :
- Vào bạn bè thì không thấy ai đang onl cả nhưng sự thật là rất nhiều người online
- Phần thông báo mặc dù đã xem rồi nhưng thông báo vẫn hiện
- Vào trang cá nhân thì chỉ có hình bông hoa
Mong Admin mau sửa lỗi để cho A.E hài lòng, ngoài ra cũng không làm mất uy tín của Trang
Những dụng cụ đo thể tích chất lỏng là bình chia độ, ca đong....
khi sử dụng dụng cụ đo độ dài cần chú ý giới hạn đo và độ chia nhỏ nhất
Giới hạn đo là độ dài lớn nhất ghi trên thước
Độ chia nhỏ nhất là độ dài hai vạch liên tiếp chia trên thước