a, Hãy tính khối lượng và trọng lượng của một khối đá . Cho biết khối đá có thể tích là 520 $dm^{3}$ và khối lượng riêng của đá là 2600 kg/ $m^{3}$ . b, Tính trọng lượng riêng của khối đá .

2 câu trả lời

                  Đổi 520 $dm^{3}$ = 0.52 $m^{3}$

a) Khối lượng của khối đá là: m = D.V = 2600 . 0.52 = 1352 (kg)

    Trọng lượng của khối đá là: P = 10m = 10. 1352 = 13 520 (N)

b) TLR của khối đá là: d = 10D = 10. 2600 = 26 000 (N/$dm^{3}$)

Đổi:520dm^3=0,52m^3

a,- Khối lượng của khối đá đó là:

D=m/V=>m=D*V=>m=2600*0,52=1352(kg)

-Trọng lượng của khối đá đó là:

P=10*m=10*1352=13520(N)

b,Trọng lượng riêng của khối đá là:

d=10*D=10*2600=26000(N/m^3)

 

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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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