1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zysi [14]
3 years ago
11

To aid in the prevention of tooth decay, it is recommended that drinking water contain 0.800 ppm fluoride, F−. How many grams of

F− must be added to a cylindrical water reservoir having a diameter of 2.02 × 102 m and a depth of 87.32 m?
Physics
1 answer:
Leviafan [203]3 years ago
4 0

Answer:

2.23 × 10^6 g of F- must be added to the cylindrical reservoir in order to obtain a drinking water with a concentration of 0.8ppm of F-

Explanation:

Here are the steps of how to arrive at the answer:

The volume of a cylinder = ((pi)D²/4) × H

Where D = diameter of the cylindrical reservoir = 2.02 × 10^2m

H = Height of the reservoir = 87.32m

Therefore volume of cylindrical reservoir = (3.142×202²/4)m² × 87.32m = 2798740.647m³

1ppm = 1g/m³

0.8ppm = 0.8 × 1g/m³

= 0.8g/m³

Therefore to obtain drinking water of concentration 0.8g/m³ in a reservoir of volume 2798740.647m³, F- of mass = 0.8g/m³ × 2798740.647m³ = 2.23 × 10^6 g must be added to the tank.

Thank you for reading.

You might be interested in
An aircraft, traveling northward, lands on a runway with a speed of 77 m/s. Once it touches down, it slows to 6.3 m/s over 705 m
KengaRu [80]

Answer:

magnitude

a = 4.18 m/s^2

Direction

Opposite to the velocity of aircraft

Explanation:

As we know that the initial speed of the aircraft when it land on the ground is

v_i = 77 m/s

now the final speed of the aircraft when it covers 705 m on runway is given as

v_f = 6.3 m/s

so here we know that

v_f^2 - v_i^2 = 2 a d

so now we can say that

6.3^2 - 77^2 = 2ad

6.3^2 - 77^2 = 2(a)(705)

a = -4.18 m/s^2

5 0
3 years ago
Are household electricity in a parallel or series circuit?
sukhopar [10]
Parallel is the correct answer!!!
6 0
4 years ago
Which of these is an example of a labor law?
Scrat [10]

Answer: D. A restriction on when a union may call a strike.

Explanation:

A labor law is concerned with the establishment of labor relation framework that provides peaceful relations between the employees and the organization. It usually includes the rules for forming a union. In this condition the union of labor or workers become a bargaining agent and conducts strikes and lock-outs to fulfill it's needs and present their grievances to the authorities.

5 0
3 years ago
Read 2 more answers
PLEASE HELP ME. And ACTUALLY give correct answers and EXPLAIN because these are free responses. If you get it right, I will mark
hram777 [196]
For the public, they may not want to share land, as for the public officials, wind turbines do cost a large amount of money to construct. Hope this helps
8 0
3 years ago
What information should be posted on or near a dishwasher?
Murljashka [212]
A.. in case of any problems that may occur you would know what company to call
7 0
3 years ago
Other questions:
  • What does the prefix kilo mean?
    9·2 answers
  • How is a boomerang different from a airplane propeller
    11·2 answers
  • Why does an object appear to be moving faster as it moves away from the axis of rotation​
    5·1 answer
  • As Earth travels in its ____, different constellations are visible at different times of the year.
    12·1 answer
  • Is kirchoff's law applicable for ac circuits?
    9·1 answer
  • Indique onde em quantos metros o rapaz chegará com as seguintes condições: S0 = 0 a) v = 3 m/s e t = 2 s b) v = 2 m/s e t = 3,5
    13·1 answer
  • True or False: It would be easier to run on a planet with high gravity than one with less gravity.
    7·1 answer
  • Anyone knows this? Please answer... Spam will be reported.
    9·1 answer
  • Which can lead scientists to change a theory that has already been accepted? Check all that apply.
    9·1 answer
  • . Calculate the time take and the distance covered by a train moving with a velocity of 15 m/s to accelerate uniformly at the ra
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!