B) What was the football's total flight time?
Answer:
A. 28 m/s
B. 5.72 s
Explanation:
The following data were obtained from the question:
Maximum height (h) = 40 m
Acceleration due to gravity (g) = 9.8 m/s²
A. Determination of the initial velocity.
Maximum height (h) = 40 m
Acceleration due to gravity (g) = 9.8 m/s²
Velocity at maximum height (v) = 0 m/s
Initial velocity (u) =.?
v² = u² – 2gh (Ball is going against gravity)
0² = u² – (2 × 9.8 × 40)
0 = u² – 784
Collect like terms
0 + 784 = u²
784 = u²
Take the square root of both side
u = √784
u = 28 m/s
Thus, the ball was kicked with a velocity of 28 m/s
B. Determination of the time of flight.
We'll begin by calculating the time taken to reach the maximum height. This can be obtained as follow:
Velocity at maximum height (v) = 0 m/s
Initial velocity (u) = 28 m/s
Time taken to reach the maximum height (t) =?
v = u – gt (Ball is going against gravity)
0 = 28 – 9.8t
Rearrange
0 + 9.8t = 28
9.8t = 28
Divide both side by 9.8
t = 28/9.8
t = 2.86 s
Finally, we shall determine the the time of flight as follow:
Time taken to reach the maximum height (t) = 2.86 s
Time of flight (T) =?
T = 2t
T = 2 × 2.86
T = 5.72 s
Therefore, the time of flight for the ball is 5.72 s
The balanced chemicalequation for the reaction between nitrogen and oxygen is:
2N₂(g) + 2O₂(g) —> 4NO(g)
The equation between nitrogen and oxygen can be written as follow:
N₂(g) + O₂(g) —> NO(g)
The above equation can be balance as illustrated below:
There are 2 atoms of O on the left side and 1atom on the right side. It can be balance by writing 2 before NO as shown below:
N₂(g) + O₂(g) —> 2NO(g)
Multiply the equation by 2, we have:
The equation is balanced!
Learn more: brainly.com/question/2399130
Answer:
2N₂(g) + 2O₂(g) ----> 2NO(g)
Explanation:
Gaseous nitrogen and gaseous oxygen reacts in a molar volume ratio of 1 : 1 to produce nitrogen (ii) oxide.
In the reaction, two molecules of nitrogen gas combines with two molecules of oxygen gas in the cylinder to form two molecules of nitrogen (ii) oxide. The equation of the reaction is given below:
2N₂(g) + 2O₂(g) ----> 2NO(g)
Nitrogen (ii) oxide is formed naturally during lightning bolts. The heat released the lightning flashes causes the nitrogen and oxygen in air to combine to form nitrogen (ii) oxide. The nitrogen (ii) oxide formed however, quickly reacts with more oxygen to form nitrogen(ii) oxide.
Nitrogen (ii) oxide is a colorless, poisonous gas. It is slightly denser than air and almost insoluble in water. it is also neutral to litmus.
b) As the distance increases by a factor, the electric force increases by twice that factor.
c) As the distance increases by a factor, the electric force decreases by twice that factor.
d) As the distance increases by a factor, the electric force decreases by the same factor.
e) As the distance increases by a factor, the electric force decreases by the square of that factor.