Tóm tắt:
$p = 3000N/m²$
$F = 600N$
$S = ? m²$
Giải:
Diện tích bị ép là:
$p = \frac{F}{S} => S = $ $\frac{F}{p} = $ $\frac{600}{3000}= 0.2 (m^2) = 20dm^2 $
Đ.số: $S = 20dm^2$
=> B. 20ddm^2
$#jully$
Đáp án:
Giải thích các bước giải:
Diện tích áp lực của vật là:
`S=F.p=600/3000=0,2m^2``0,2m^2=20dm^2`Vậy đáp án là `B:20dm^2`
2.Đánh dấu vào ô trống trước các ý đúng Hầu hết các sinh vật có kích thước khác nhau là do cơ thể chúng có số lượng tế bào giống nhau Hầu hết các sinh vật có kích thước khác nhau là do cơ thể chúng có số lượng tế bào khác nhau Tùy thuộc vào số lượng tế bào cấu tạo nên cơ thể, tất cả sinh vật trên Trái Đất được chia làm hai nhóm lớn là cơ thể đơn bào và cơ thể đa bào cơ thể đơn bào có tổ chức phức tạp, được cấu tạo từ nhiều tế bào Cở thế đơn bào có tổ chức đơn giản, cơ thể chỉ là một tế bào
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