Basic basic basic, fundamental, elementary, and basic.
Please memorize this <em>definition</em> of acceleration:
<em>Acceleration</em> = <em>(change in speed) </em><em>divided by</em><em> (time for the change)</em> .
For example: Goes from 0 m/s to 10 m/s in 5.0 sec.
Change in speed = (10 - 0) = +10 m/s
Time for the change = 5.0 sec.
Acceleration = (+10 m/s) / (5.0sec) = +2 m/s² .
One charge is enough in order to have an electric field.
In fact, every charge generates an electric field: for example, the electric field generated by a single point positive charge is radial, as shown in the attached figure. More complicate electric field configurations can be obtained adding charges or using more complicate charge distributions, but one charge is enough to have an electric field.
Answer:
65.3
Explanation:
W = (1/2)mv^2
W = (1/2)(0.145kg)(30m/s)^2
The correct answer is the statement #3. The statement that says: your hypothesis must be testable, is a true statement about the scientific process. IT will be truly unreasonable and a waste to be doing experiments on a hypothesis that is not even possible to solve.