Number 20 is B and 21 is C
Answer:
58.8J
Explanation:
Given parameters;
Mass of ball = 4kg
Height above the floor = 1.5m
g = 9.8n/kg
Unknown:
Potential energy = ?
Solution:
The potential energy of a body is the energy due to the position of the body.
It is mathematically expressed as:
Potential energy = mass x acceleration due to gravity x height
Potential energy = 4 x 9.8 x 1.5 = 58.8J
Psychophysics is the scientific study
To place the poles of a 1. 5 v battery to achieve the same electric field is 1.5×10−2 m
The potential difference is related to the electric field by:
∆V=Ed
where,
∆V is the potential difference
E is the electric field
d is the distance
what is potential difference?
The difference in potential between two points that represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other.
We want to know the distance the detectors have to be placed in order to achieve an electric field of
E=1v/cm=100v/cm
when connected to a battery with potential difference
∆v=1.5v
Solving the equation,we find
![d = \frac{ \:Δv}{e}](https://tex.z-dn.net/?f=d%20%3D%20%20%5Cfrac%7B%20%5C%3A%CE%94v%7D%7Be%7D%20)
![= \frac{1.5v}{100v/m}](https://tex.z-dn.net/?f=%20%3D%20%20%5Cfrac%7B1.5v%7D%7B100v%2Fm%7D%20)
![= 1.5 \times 10 {}^{ - 2} m](https://tex.z-dn.net/?f=%20%3D%201.5%20%5Ctimes%2010%20%7B%7D%5E%7B%20-%202%7D%20m)
learn more about potential difference from here: brainly.com/question/28166044
#SPJ4
<span>force applied causes movement of an object in the same direction as the applied force.</span>