Answer:
Explanation:
Force F = 20 t² N so force is variable.
friction on the crate = mgμ , μ is coefficient of kinetic friction , m is mass
Net force
= F - mgμ
= 20 t² - mgμ = m dv / dt ( Newton's 2 nd law )
m dv = (20 t² - mgμ ) dt
Integrating on both sides,
m v = 20 (t³ / 3) - mgμ t
Putting the values ,
25 x v = 20 x 4³/3 - 25 x 9.8 x .25 x 4
25 v = 426.67 - 245
25 v = 181.67
v = 7.27
v = 7.27 m /s
The potential difference isV=220−85=135.
Now the potential V at distance d from a point charge Q isV=Q/4πϵ0d
If you solve this for d and plug in the potential difference you will get the answer.
Answer:
The correct answers to the question are
1. Environmental variable c,
2. Input variable a,
3. Output variable b,
4. Input variable a,
5. Input variable a,
6. Input variable a
Explanation:
1. Outside temperature.
This is is an environmental variable regarding where the observation is taking place
2. Duration that the soup was heated before being put in the bowl.
This can be controlled so it is an input variable
3. Temperature of the soup in a student's bowl.
This depends on the initial temperature the soup was heated to so it is an output variable
4. Temperature level to which the soup is warmed up.
Input variable as it can be controlled o varied
5. Insulation of the bowl used for storing the soup.
This is an input variable as the type of bowl can be selected
6. Duration that the soup bowl is open when the server inserts the ladle to serve a student.
server or the operator of the cafeteria
<u>Answer</u>
10 feet
<u>Explanation</u>
The Occupational Safety and Health Administration (OSHA) requires one to be not less than 10 feet from overhead power lines that are 0-50,000 v for him or her safety suppose. High voltages above 50 Kv needs a bigger distance that 10 feet.
When current is flowing through a conductor, it produces an electric fields all around it. These fields spreads far from the conductor depending on the current flowing in it. When this fields are strong enough the can cause electrocution.
It is very large in size, I don’t have an exact number but i believe it is over the 1,000s.