which of the following is not necessary in a great summary?your investigayltion, your predicatio, excuses, possible errors?

A surface will be an equipotential surface if (there may be more than one correct choice).A. the electric field is zero at all p

aev [14]

Answer:

c. A, C

Explanation:

On equi-potential surface, fields are equal in magnitude at all points . If field is zero at all points , they will be equal so first option is correct.

Field is perpendicular to equipotential surface at all points.

6 0

2 years ago

Calculate the power of a light bulb that uses 40J of electricity in 4 seconds.

alexdok [17]

Answer:

power=work done /time

power=40J/4s

power=10wat

7 0

3 years ago

I need help with this question I’m not sure where to even begin

Strike441 [17]

We will have the following:

a. We determine the tension force of T2 as follows:

We know that the system must be at equilibrium on the horizontal axis:

$\sum F_x=T_1cos(42.5)+T_2cos(36.5)=0$

So:

$\begin{gathered} T_2cos(36.5)=-(1235N)cos(42.5)\Rightarrow T_2=-\frac{(1235N)cos(42.5)}{cos(36.5)} \\ \\ \Rightarrow T_2=1132.711003...N\Rightarrow T_2\approx1132.7N \end{gathered}$

So, the value of T2 is approximately 1132.7 N.

b. We will determine the torques created by T1 and T2 as follows:

T1:

$\tau_{T1}=(10m)(1235N)sin(42.5)\Rightarrow\tau_{T1}\approx8343.5N\ast m$

T2:

$\tau_{T2}=(10m)(1132.7N)sin(36.5)\Rightarrow\tau_{T2}\approx6737.6N\ast m$

So the torques of T1 and T2 on the base are approximately 8343.5 N*m and 6737.6 N*m respectively.

c. The torques around that axis generated by the normal force and the weight are both 0 N*, since they are parallel to the axis.

d. We will determine the angular acceleration as follows:

$\begin{gathered} \alpha=\frac{\tau_{T1}}{I}\Rightarrow\alpha=\frac{\tau_{T1}}{(1/3mL^2)} \\ \\ \Rightarrow\alpha=\frac{(8343.5N\ast m)}{(1/3(200kg)(10m)^2)}\Rightarrow\alpha=1.251525rad/s^2 \\ \\ \Rightarrow\alpha\approx1.25rad/s^2 \end{gathered}$

So, the angular acceleration is approximately 1.25 radians/ s^2.

6 0

1 year ago

What are the chemical symbols for the elements: gold, silver, and tin respectively? A) Ag, Au, and Sn

Grace [21]

Answer:

The answer to your question is B) Au, Ag and Sn

Explanation:

This is a brief explanation of the origin of the symbols

Gold: the symbol (Au) comes from the Latin Aurum

Silver: the symbol (Ag) comes from the Latin Argentum

Tin: the symbol (Sn) comes from the Latin Stannum

Titanium has the chemical symbol Ti-

5 0

2 years ago

Good morning! someone please answer this, ill give you brainliest and your earning 50 points.

wariber [46]

One step of copper mining requires blasting ore to be able to blasted and extracted from mine.

This process causes harm to the Geosphere (Lithosphere)
In this step, they blast the mines inside the earth. Which causes destruction and harm to the geosphere.
We know that, land comes under Geosphere also known as Lithosphere.

Mercury is used to recover minute pieces of gold that is mixed in soil and sediment. Sometimes Mercury can be lost in this process resulting in widespread contamination of local rivers and lakes.

This causes harm to the Hydrosphere.
The portion of earth covered with water is known as hydrosphere.
Since, The Mercury is getting mixed with the water. It is polluting the water that is the hydrosphere.

Hundreds of tons of rock are unearthed, moved and crushed in mining operation significantly increasing the amount of dust and particulates in the air.

This causes harm to the Atmosphere.
The particles of dust get increased in air and eventually gets mixed and spread everywhere.
The air is getting polluted which means the atmosphere is getting harmed.

Strip mining (also known as mountaintop removal) involves scraping away earth and rocks to get to coal buried near the surface. This often results in the destruction of ecosystems.

This causes harm to the Biosphere.
The biosphere consists of plants and animals. And these plants and animals collectively form a habitat called ecosystem.
When a ecosystem is destroyed, the biosphere is harmed.

8 0

2 years ago