You want all those boxes filled in (0,0)
Answer:
The time is 
Explanation:
Given that,
Number of energy level n= 1
Energy E₁=4 eV
We need to calculate the time period
Using formula of time period
Where, E = energy
h = Planck constant
Put the value into the formula
Hence, The time is
Answer:
A. The net force acting on the car from all directions is zero.
Explanation:
According to Newton's first law of motion, an object continues its uniform motion along a straight line, the net force acting on the object will be zero.
To experience a force, the object needs to change its speed or the direction of motion. Unless it experiences any change in the magnitude of speed or direction. The car doesn't experience any force.
If car is moving with a uniform speed in a circular motion. The net force acting on the car is not equal to zero. Since the car is changing its direction constantly, a force called centripetal force is acting on it.
Hence, if the car moves in a straight line, the net force acting on the car from all directions is zero.
C. The average acceleration is positive and smaller in magnitude than the initial acceleration.
<h3>
What is average velocity?</h3>
Average velocity is defined as the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs.
a = Δv/Δt
where;
- Δv is change in velocity
- Δt is change in time
a = (250 - 248) / (70 - 40)
a = 0.067 m/s²
Thus, we can conclude that the average acceleration is positive and smaller in magnitude than the initial acceleration.
Learn more about average acceleration here: brainly.com/question/17587670
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