Answer:
một mạch điện gồm hai điện trở r1 và r2 mắc song song với nhau. khi mắc vào hai đầu đoạn mạch một hiệu điện thế U=3V thì hiệu điện thế giữa hai đầu điện trở r là bao nhiêu
nothing will happen to the stone
Answer:
1. 1.568 x 10^6 N m^2 / C
2. - 1.568 x 10^6 N m^2 / C
Explanation:
E = 4.9 x 10^4 N/C
Side of square, a = 8 m
Area, A = side x side = 8 x 8 = 64 m^2
Angle between lane of sheet and electric field = 30°
Angle between the normal of plane of sheet and electric field,
θ = 90°- 30° = 60°
The formula for the electric flux is given by
(1)
By substituting the values, we get
Ф = 4.9 x 10^4 x 64 x Cos 60 = 1.568 x 10^6 N m^2 / C
(2)
By substituting the values, we get
Ф = - 4.9 x 10^4 x 64 x Cos 60 = - 1.568 x 10^6 N m^2 / C
Answer:
Explanation:
The reaction between hypothetical elements X and Y to produce hypothetical compound XY₂ is represented with the chemical equation:
That equation means that one atom (or one mole of atoms) of element X reacts with 2 atoms (or two moles of atoms) of element Y to produce one molecule (one mole of molecules) of compound XY₂.
Elements X and Y are the reactants, and compound XY₂ is the product.
Hence, the mole ratio is:
- 1 mol X : 2 mol Y : 1 mol XY₂
Since, 10.0 mol of Y completely react you can set the corresponding proportions with X and XY₂ to find how many moles of them will be in the reaction:
<u>1. Moles of X</u>:
- Theoretical ratio: 1 mol of X / 2 mol of Y
- Ratio with 10.0 mol of Y: U / 10.0 mol of Y
- Proportion: equal the two ratios: 1 mol X / 2 mol Y = U / 10.0 mol Y
- Solve for U: U = 10.0 mol Y × 1 mol X / 2 mol Y = 5.0 mol X
- Result: 5.0 moles of X are in the reaction.
<u>2. Total moles of X and Y in the reaction:</u>
- The total number of moles is the sum of the moles of the two reactants: 10.0 moles of Y + 5.0 moles of X = 15.0 moles. Hence 15.0 mol of X and Y are in the reaction: option C).