Đề kiểm tra học kỳ I vật lý 8 trường THCS Nghĩa Tâ...

A \({v_{tb}} = \frac{{{s_1}}}{{{t_1}}} + \frac{{{s_2}}}{{{t_2}}}\)

B \({v_{tb}} = \frac{{{v_1} + {v_2}}}{2}\)

C \({v_{tb}} = \frac{{{s_1} + {s_2}}}{{{t_1} + {t_2}}}\)

D \({v_{tb}} = \frac{{{s_1} + {s_2}}}{{{t_1}.{t_2}}}\)

A  Trước       

B Sau   

C  Bên trái   

D Bên phải

A \(P = m.V \)

B \(P = d.V\)

C  \(P = d.h\)

D \(P = \frac{h}{m}\)

A  m/s  

B  N/m³ 

C N/m  

D Pa

A \(a)\,\,4,5\,\,N;\,\,b)\,\,2250\,\,Pa\)

B \(a)\,\,4,5\,\,N;\,\,b)\,\,22\,\,Pa\)

C \(a)\,\,12\,\,N;\,\,b)\,\,765\,\,Pa\)

D \(a)\,\,45\,\,N;\,\,b)\,\,22,50\,\,Pa\)

A \(a.\,\,32\,\,Pa;\,\,b.\,\,20\,\,Pa\)

B \(a.\,\,3200\,\,Pa;\,\,b.\,\,20\,\,Pa\)

C \(a.\,\,3200\,\,Pa;\,\,b.\,\,2000\,\,Pa\)

D \(a.\,\,32\,\,Pa;\,\,b.\,\,2000\,\,Pa\)

A \(a.\,\,2\,\,N;\,\,b.\,\,1,2\,\,{m^3};\,\,c.\,\,30800\,\,N/{m^3}\), rỗng

B \(a.\,\,2\,\,N;\,\,b.\,\,1,2\,\,{m^3};\,\,c.\,\,30800\,\,N/{m^3}\), đặc

C \(a.\,\,1,2\,\,N;\,\,b.\,\,1,{2.10^{ - 4}}\,\,{m^3};\,\,c.\,\,30800\,\,N/{m^3}\), rỗng

D \(a.\,\,1,2\,\,N;\,\,b.\,\,1,{2.10^{ - 4}}\,\,{m^3};\,\,c.\,\,30800\,\,N/{m^3}\), đặc