Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?

Answers

Answer 1

Answer: Well we know that density=mass divided by volume, so let's substitute :)

11.3=282.5/V

Now we know that 282.5 has to be divided by SOMETHING in order to get 11.3.

You can waste time trying every number under the sun, or you can use a little trick I learned in elementary school which is to divide 282.5 by 11.3. This works because it shows how many times 11.3 goes into 282.5 which is the volume of this "piece of" lead. Since 11.3 goes perfectly 25 times into 282.5, the Volume of this "piece of" lead is 25 cm³. :)

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Define SI systems of units

Answers

Answer:

the system of measurement accepted by theinternational convention of scientists held in france in 1960 is called si systems of units

3) A car company is looking to design an electric car. Which of these would not be a constraint that would limit possible designs?
A) Electric cars must be approximately the same size as other cars.
B) The company must ensure the cost of the car is not too expensive.
C) Electric cars are better for the environment than gas powered cars.
D) There are a limited number of types of batteries that can power a car.

Answers

A Correcting each car to the same size as the first one invented could get in the way during work days.

I honestly think the answer is actually C).

Nếu tăng khoảng cách giữa hai điểm lên 4 lần thì lực tương tác tĩnh điện giữa chúng sẽ

Answers

Answer:

điện giữa chúng s

Explanation:

A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface. What is the relationship between A and B?A > B
A = B
A< B
It will not slow down, but continue moving at constant velocity.

Answers

Answer:

$A = B$

Explanation:

A work pulls the crate by horizontal force on it

Now due to this applied force crate is moving horizontally with uniform speed

so we can say that the acceleration of the crate will be zero

now by Newton's II law we can say

$F_(net) = 0$

$F - F_f = 0$

so here we will have

$F_f = F$

here we know that applied force is A

so F = A

and friction force is B

$F_f = B$

so correct relation is

$A = B$

If an object is moving at a constant velocity ( That means a constant speed in a straight line. ) the net force acting on the object is zero, nothing. Why? It's motion is described by Newton's first law: An object at rest will remain at rest and an object in motion will remain in motion moving at constant velocity unless acted by an outside force.

Millikan measured the electron's charge by observing tiny charged oil drops in an electric field. Each drop had a charge imbalance of only a few electrons. The strength of the electric field was adjusted so that the electric and gravitational forces on a drop would balance and the drop would be suspended in air. In this way the charge on the drop could be calculated. The charge was always found to be a small multiple of 1.60 × 10-19 C. Find the charge on an oil drop weighing 1.00 × 10-14 N and suspended in a downward field of magnitude 2.08 × 104 N/C.

Answers

Answer:

$4.8\cdot 10^(-19) C$

Explanation:

For a drop in equilibrium, the weight is equal to the electric force (in magnitude):

$W = F_e$

where here we have

$W=1.00\cdot 10^(-14)N$ is the weight of the drop

$F_e$ is the magnitude of the electric force, which can be rewritten as

$F_e = qE$

where

q is the charge of the oil drop

$E=2.08 \cdot 10^4 N/C$ is the magnitude of the electric field

Substituting into the equation and solving for q, we find the charge of the oil drop:

$q=(W)/(F_e)=(1.00\cdot 10^(-14)N)/(2.08\cdot 10^4 N/C)=4.8\cdot 10^(-19) C$

About how long have wastewater treatment plants been in existence? about how long have wastewater treatment plants been in existence? 50 years 120 years 190 years 220 years 300 years

Answers

Wastewater treatment plants have been in existence for about 120 years.

The development of wastewater treatment plants began in the late 19th century, around the 1890s. The need for wastewater treatment arose as industrialization and urbanization led to increased pollution of water bodies due to the discharge of untreated sewage and industrial effluents.

The first modern wastewater treatment plant is often credited to the city of Paris, France, which constructed its first large-scale sewage treatment plant, known as the "Clichy-la-Garenne Sewage Farm," in 1889. This plant utilized biological treatment processes to remove organic matter from wastewater before discharging it into the Seine River.

Over the following decades, the importance of wastewater treatment became recognized, and more cities and municipalities around the world started investing in the construction of wastewater treatment plants. The development and advancement of treatment technologies continued throughout the 20th century, leading to more efficient and effective treatment processes.

Today, wastewater treatment plants play a critical role in protecting public health and the environment by treating and purifying wastewater before it is discharged back into natural water bodies or reused for various purposes. These plants use a combination of physical, chemical, and biological processes to remove pollutants and contaminants, ensuring that the water released is safe for the environment and human use.

In summary, wastewater treatment plants have been in existence for approximately 120 years, evolving from basic sewage farms to sophisticated facilities that are essential for maintaining water quality and sustainability in modern urban and industrialized areas.

To learn more about Wastewater treatment, here

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Water treatment plants have been in existence for almost 220 years

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