người ta pha 2l nước với 3l sữa Tính khối lượng riêng cua hốn hợp Bt klr của nước là 1000kg/m3, của sữa là 1200kg/m3

2 câu trả lời

Khối lượng nước là:

$m=D.V=1.2=2(kg)$

Khối lượng sữa là:
$m=D.V=1,2.3=3,6(kg)$
Khối lượng riêng của hỗn hợp là:
$D=\dfrac{m}{V}=\dfrac{2+3,6}{2+3}=1,12(kg/l)$

 

Đáp án:

 

Giải thích các bước giải:

`V_1=2l=2dm^3=0,002m^3`

`D_1=1000kg//m^3`

`V_2=3l=3dm^3=0,003m^3`

`D_2=1200kg//m^3`

`D=?`

Thể tích của hỗn hợp nước và sữa là : 

`V=V_1+V_2=0,002+0,003=0,005m^3`

Khối lượng của nước là : 

`m_1=D_1.V_1=0,002.1000=2kg`

Khối lượng của sữa là : 

`m_2=D_2.V_2=0,003.1200=3,6kg`

Khối lượng của hỗn hợp nước và sữa là :

`m=m_1+m_2=2+3,6=5,6kg`

Khối lượng riêng của hỗn hợp là : 

`D=m/V=(5,6)/(0,005)=1120`$kg/m^3$

Câu hỏi trong lớp Xem thêm

I. Circle the correct one. “Too or Enough” 1) This car is too/enough old. We cannot go anywhere. 2) This book is too/enough thick for me to read. 3) That dress is cheap too/enough to buy. 4) This question is too/enough complicated to answer. 5) Everybody is too/enough excited about the holiday to focus on their work. 6) I can join that club. I’m young too/enough. 7) She can’t come with us to the bar. She’s too/enough young. 8) We have too/enough eggs to make a cake. 9) Do we have too/enough time to catch the bus? 10)This boy is too/enough noisy. I can’t study! 11)Mary’s room is too/enough dirty. Her mom is angry. 12)Tom is tall too/enough to join a basketball team. 13)This bag is too/enough heavy. I can’t carry it. II. Complete with “too” or “enough”. 1- She is clever ........................ to pass the test. 2- The skirt is ........................ long for you. 3- Kate is .......................young to drive a car. 4- There is ......................... meat in the fridge for the whole week. 5- I didn’t work hard ........................ to pass the exam. 6- We can’t buy the car because it is .......................expensive. 7- He can’t sleep because he drinks .......................much coffee. 8- Are you tall ...................... to reach that shelf? 9- They often take the bus to school because it’s ................... far to walk. 10- She isn’t fast ...................... to win the race. 11- There’s .......................food for everyone to eat. 12- She isn’t speaking clearly ................for me to understand. III. Complete the sentences with “too – enough” by using the words given. 1) I don’t want to eat that soup. It is _______________________. ( cold ) 2) She can’t come to party with us. She isn’t _______________________. ( old ) 3) They need much money. That car is _______________________ to buy. ( expensive ) 4) We don’t need to worry about the food. It is _______________________. (fresh ) 5) I missed the bus because I got up _______________________. ( late ) 6) I cannot buy that dress. It isn’t _______________________ for me to buy. ( cheap ) 7) I cannot climb that mountain. It is _______________________. ( high ) 8) You should help your sister. She is _______________________ to eat herself. (young) 9) It is _______________________ to see the way. ( foggy ) 10) He is _______________________ to win the race. ( fast ) 11) He is _______________________ to be the headmaster. ( qualified ) 12) Don’t want any help from him. He is _____________________ to help anyone. (rude) 13) The movie was _______________________. I couldn’t watch it. ( boring ) 14) Ben is _______________________ to solve the problems. He never studies. ( lazy ) 15) The questions were _______________________ to solve. ( difficult ) 16) Jeremy is _______________________ to talk people. ( shy ) 17) Ashley is _______________________ to pass the test. ( hardworking ) 18) I can’t wear this t-shirt. It is _______________________. ( small ) Giúp mk vs, tuy ns dài nhưg rấc cần sự giúp đỡ! Mk cần 2 bn lm ạ, bn nào có sức thì làm 2 bài, còn bn còn lại lm 1 bài a

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