<h2>Hello!</h2>
The answer is: B. Kinetic energy
<h2>
Why?</h2>
Since the ball is falling, speed increases because the gravity acceleration is acting. When speed increases, the kinetic energy increases too, so the ball is gaining kinetic energy.
The gravity acceleration is equal to 
, it means that when falling, the ball will increase it's speed 9.81m every second.
We can calculate the kinetic energy by using the following formula:
Where:
Have a nice day!
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<h2>
Answer: (a)t=0.553s, (b)x=110.656m</h2>
Explanation:
This situation is a good example of the projectile motion or parabolic motion, in which the travel of the bullet has two components: x-component and y-component. Being their main equations as follows:
x-component:
(1)
Where:
is the bullet's initial speed
because we are told the bullet is shot horizontally
is the time since the bullet is shot until it hits the ground
y-component:
(2)
Where:
is the initial height of the bullet
is the final height of the bullet (when it finally hits the ground)
is the acceleration due gravity
<h2>Part (a):</h2>
Now, for the first part of this problem, the time the bullet elapsed traveling, we will use equation (2) with the conditions given above:
(3)
(4)
Finding :
(5)
Then we have the time elapsed before the bullet hits the ground:
(6)
<h2>Part (b):</h2>
For the second part of this problem, we are asked to find how far does the bullet traveled horizontally. This means we have to use the equation (1) related to the x-component:
(1)
Substituting the knonw values and the value of found in (6):
(7)
(8)
Finally:
Answer:
B. Identifying the types of data to be gathered
Explanation:
Identifying the types of data to be gathered is one of the part of designing a set of experimental procedure.
An experimental procedure is a methodical process that must be followed in order to attain the goal of the experiment.
- As with most experiments, data is collected for further analysis and interpretation.
- The choice of way of collecting data and the type of data to be collected is very important when designing an experiment.
Answer:
The answer is C.
Explanation:
If there are brake lights then you should drive slower.
The electrical force between the two charges can be calculated as +1.8×10⁻² N and its repulsive.
To find the electrical force, distance = 2 meters
charge q1 = 2×10⁻⁶ C
charge q2 = 4×10⁻⁶ C
<h3>Define coulomb's law and solve with formula.</h3>
The force of attraction or repulsion acting along a straight line between two electric charges is directly proportional to the product of the charges and inversely to the square of the distance between them.
Formula can be written as,
F = K ( q1q2 / r² )
F - electric force
k - Coulomb constant
q1, q2 - charges
r - distance of separation
Substituting the values in the formula,
F = 9 × 10⁹ Nm²/C² ( (2×10⁻⁶ C × 4×10⁻⁶ C) / (2²))
= 0.0179751
F = 1.8 × 10 ⁻² N.
As both the charges q1 and q2 are positive, the charges gets repulsive.
SO, the correct answer is Option A.
Learn more about coulomb's law,
brainly.com/question/506926
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