wind blows at the speed of 30m/s across a 175m^2 flat roof if a house.
what is the pressure difference between inside the house and the outside of the house just above the roof? (assume the air pressure inside the house is atmospheric pressure)
what is the force on the roof due to pressure difference?
Answers
The pressure difference between inside the house and the outside of the house is 540 Pa.
Pressure based problems:Using Bernoulli's equation.
\(P1+\frac{1}{2} \rho v1^2 = P2 + \frac{1}{2} \rho v2^2 \\\\P1 + 0 = \delta P = \frac{1}{2} \rho v2^2 \\\\\delta p = \frac{1}{2}(1.2)(30)^2\\\\\delta p = 540 pa\)
Using pressure definition:
ΔP = F / A
F = 9.45 × 10⁴ N
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Related Questions
WILL GIVE BRAINELY! PLEASE HELP!
Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?
A.Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
B. Find the mass of a log. Burn the log until it turns to ash. Find the mass of the ash.
C.Find the mass of a piece of paper. Tear the paper into smaller pieces. Find the mass of the pieces.
D.Find the mass of a stick of butter. Heat the butter until it melts. Find the mass of the melted butter.
Answers
Here, we are required to determine which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction.
The Correct answer is option A.
First, a chemical change is one in which a chemical compound is transformed into one or more chemical substances and consequently, the resulting compounds have different chemical properties as their atoms are arranged differently.
From the definition above, it is evident option A where an acid and a base are reacted together to form water and salt is an example of chemical change and obeys the law of conservation of matter.
This is so because, upon first measuring the mass of the acid and base separately and then measuring the mass of the resulting salt and water.
The mass in both instances is constant.
Therefore, the correct answer is option ARead more:
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Explain what happens as the heart grows bigger.
Answers
Initially, the heart may grow bigger as a compensatory mechanism to try to keep up with increased demands for blood and oxygen. For example, if a person engages in regular exercise, their heart may enlarge to accommodate the increased demand for blood and oxygen to the muscles.
However, if the heart continues to grow over time, it can become less efficient at pumping blood and may develop structural abnormalities that increase the risk of heart failure, arrhythmias, and other complications.
In some cases, cardiac hypertrophy may be reversible if the underlying cause is treated, such as by managing high blood pressure or heart disease. However, if left untreated, hypertrophy can lead to irreversible damage to the heart muscle and may require more aggressive interventions, such as medication, surgery, or other medical procedures to manage the condition.
Discuss one component of your school's recycling system that could be automated and predict the economic impact.
Answers
One component of my school's recycling system that could be automated is the sorting of recyclables. Currently, the school relies on students and staff to sort recyclables into the appropriate bins, which can be time-consuming and may result in contamination if materials are not sorted properly.
Automating the sorting process with a machine or conveyor belt system could improve the efficiency and accuracy of the recycling system. It could also potentially reduce labor costs associated with manual sorting.
The economic impact of automating the sorting process would depend on the initial cost of the equipment and any associated installation or maintenance costs. However, over time, the improved efficiency and accuracy of the system could result in cost savings for the school. Additionally, the increased efficiency of the system could potentially lead to increased recycling rates, which could result in cost savings for waste disposal and potentially generate revenue through the sale of recycled materials.
Answer:
Our school has color coded virtual trash cans. For example, a trash can for only paper will only accept paper items, if the item put inside is not paper, it will litter it out and all students have cleaning duties throughout the week so even if you or someone litters you’ll probably have to clean it up at some point anyways. I honestly think it’s very cool. (i wish this was true smh).
plz help it really easy
Answers
The answer is high to low.
PLEASE HELP ON QUESTION ASAP !
Hi please help on question.If you get answer correct is be willing to give brainliest,a thanks, five stars and 10pts.
My question:
As an analogy of a circuit with resistance, think of an obstacle race . Which parts of a circuit do the obstacles represent? which part of the circuit do the people respresent?
Answers
In an analogy of a circuit with a resistance to an obstacle race, we can consider various elements of the race as representative of different components of the circuit.Obstacles, Track or Route, Participants, Start and Finish Line.
Obstacles: The obstacles in the race represent the resistors in a circuit. Just as resistors impede the flow of current in a circuit, obstacles in the race create hurdles that slow down the participants. The difficulty or magnitude of the obstacles can be equated to the resistance value of the resistors in a circuit.
Track or Route: The race track or route itself can be seen as the conductive path in a circuit. It provides a pathway for the participants to move and complete the race. Similarly, the conductive path in a circuit allows the flow of current from the power source to the load.
Participants: The people participating in the race represent the flow of electrons in a circuit. Just as the participants move through the obstacles in the race, electrons move through the resistors in a circuit. The rate at which participants complete the race can be compared to the current flowing through the circuit.
Start and Finish Line: The start and finish line of the race correspond to the terminals of a circuit. The start line represents the positive terminal, where the participants begin their journey, and the finish line represents the negative terminal, where the race concludes.
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Answer: As an analogy of a circuit with resistance, the obstacles in an obstacle race represent the resistance in a circuit. The parts of the circuit that the obstacles represent are the resistors. The people in the obstacle race represent the current in a circuit. The current is the flow of charged particles (such as electrons) in a circuit. In an obstacle race, the people are moving through the obstacles, just as the charged particles are moving through the resistors in a circuit. The obstacles slow down the people, just as the resistors slow down the flow of charged particles in a circuit.
Explanation:
Which has more total thermal energy: a glass of water or a pool?
Answers
There is a difference between energy and temperature. You can have a swimming pool and a beaker of water at exactly the same temperature. Even though they are at the same temperature the swimming pool represents a much bigger thermal energy store than the beaker of water.
Which equation below is the correct equation for photosynthesis?
Answers
Charles Darwin,
Seeing this new artificially designed creature at home, as the result of breeding, he coined the term ____ ______ to explain the variation of species around the islands and (by extension of his theory) also word wide
A. Amateur Selection
B. Artificial Selection
C. photosynthesis
D. Natural Selection
Answers
What would happen to the digestion process if enzymes were not present
Answers
Answer: It would take 2.3 billion years for the biological reaction without the presence of enzymes. It’s because, without them, your body can’t break down foods so that nutrients can be fully absorbed. Every organ, every tissue, and every 100 trillion cells in our body rely upon the reaction of metabolic enzymes and their energy component.
Explanation:
I hope this helps
Without enzymes, the body would not be able to break down complex carbohydrates, proteins, and fats into their component molecules. This means that these nutrients would not be absorbed by the body and would be excreted as waste.
Additionally, the lack of enzymes would make it difficult for the body to digest and absorb vitamins and minerals. This could lead to malnutrition and other health problems over time.
Overall, the absence of enzymes from the digestive process would severely impair the body's ability to extract nutrients from food and could have negative consequences for overall health and well-being.
One of your friends read online that a city near a fault has experienced an earthquake every 10 years. The last earthquake in this city happened 10 years ago so your friend says that another one will happen this year. Is your friend correct? Why or why not?
Correct answer gets brainly,
Answers
Answer
your friend is correct.
Explanation
If the fault has experienced an earthquake every 10 years and that the last one was 10 years ago then this year would be the year it goes off again.
Complete this sentence. If the mass of object A is __________ than object B, then the weight of object A will be _______________ the weight of object B.
greater, heavier than
less, heavier than
greater, the same as
less, the same as
Answers
Answer:
Complete this sentence. If the mass of object A is greater than object B, then the weight of object A will be heavier the weight of object B.
Explanation:
If the mass of Object A is more/greater than object B then it would be "heavier"
The distance between the 2nd compression and the 3rd compression in a longitudinal wave is 200 cm. Find the wavelength of the wave.
I need the answer with working and formula..
Class - 8, Ch:13 - Sound, NCERT, CBSE
Answers
Explanation:
\(3 \times 200 \div 5\)
Answer:
The wavelength of the wave can be calculated using the equation λ = 2L/n, where L is the distance between two compressions and n is the number of compressions. In this case, the distance between compressions is 200 cm and the number of compressions is 3, so the wavelength is 133.3 cm.
help thank you. will mark as brainliest if correct and no link to some unknown websites
Answers
Answer: 4
Explanation:
The answer to this question is number 4 as part 4 is where the roller coaster is slowing down. This means that it is gaining stored potential energy and in turn, losing kinetic energy. Furthermore, an object gains potential energy as it goes higher, usually.
When the rudder moves to the left the plane will move to the right
Answers
Explanation:
the answer is false because when the rudder mover to the left the plane will also move to the left. The plane tilts to go to the left.
I don't understand how a shovel is a 3rd class lever.
isn't the load at the bottom? effort at the top? a fulcrum at the middle??? wouldn't that make it a first class lever? or am i just wrong?
Answers
Answer:
I think you are correct but you should still check gogle to be 100 percent sure
Explanation:
When you scoop up dirt with a shovel,
you put one hand on the top of the
shovel’s handle and the other on the middle of the shovel. The dirt, which is the load, sits on the shovel’s scoop.
The hand on the middle of the shovel is the one that does the work. This hand lifts the shovel and the load up from the ground.
The advantage of a third-class lever is that the load moves farther than the effort. You only need to lift the middle of the shovel a bit to raise the scoop with its load of dirt up quite a lot.
How does the agricultural activity most likely affect the surface water of the area?
Answers
Answer:
Agriculture has been the cause of significant modification of landscapes throughout the world. Tillage of land changes the infiltration and runoff characteristics of the land surface, which affects recharge to ground water, delivery of water and sediment to surface-water bodies, and evapotranspiration.
Explanation:
Which of the following has the highest frequency?
A. Microwave
B. Gamma Ray
C. Radio Wave
D. Ultraviolet Light
Answers
Have a good day/night
Hope this helps
The mass of an object does not depend on its shape - it stays the same. Give an example that would prove this to be true.
Answers
Answer:
it depends on the density.
an object can be small but way more.
Explanation:
i) What happens to bulb X?
ii) What happens to bulb Y?
Refer Picture
Answers
Answer: (I) goes out
(ii)gets bright
Explanation:
A defender should pivot when they wish to change their ______.
angle
speed
strength
tempo
Answers
please help me please
Answers
Answer:
A
Explanation:
its A because your comparing so comparative
Why does a nucleus always have a positive charge?
Answers
Answer:
Explanation:
The nucleus is positive because only protons live in the nucleus. Electrons (which have a minus charge ) orbit around the nucleus, but only the nucleus has positive charges.
Mathew is simulating forces on a simple machine. He runs four tests as shown. Which test illustrates a balanced net force?
Answers
Answer:
test 4
Explanation:
equal amount of force upward and downward
Explain: equal amount of force upward and downward.
Your welcome
Tanya planted seedlings in her garden over the weekend. The instructions that came with the seedlings stated that they need to be planted 0.2 meters apart. Tanya has a measuring tape that has values in centimeters. Help Tanya convert meters to centimeters.
Determine the ratio to use: .
Tanya should plant the saplings 20 centimeters apart.
1 meter is equal to 100 centimeters.
Multiply the given value by the ratio: .
Answers
Answer:
Explanation:
1 meter = 100 cm
1 cm = 10 mm
Then,
0.2 m * 100 cm / 1 m = 20 cm
This does not seem like a physics question ??
Which observed feature of the universe, discovered by Edward Hubble, is illustrated in the diagram? A) entropy B) expansion C) radiation D) redshift
Answers
From today’s perspective, the reality of a very large, old, expanding universe, filled with billions of galaxies that are receding from each other as the cosmic space expands from an initial “Big Bang” billions of years ago seems so obvious that we expect it must have been known for centuries.
sorry if i’m wrong:(
Ms. Bristol measured the mass of a closed beaker containing several ice cubes. The mass was 100 grams. An hour later, after the ice cubes had melted, Ms. Bristol measured the mass of the beaker again. What was the mass of the beaker of water the second time?
Answers
Answer:
100
Explanation:
What two gases in the atmosphere do animals and plants need to breathe and grow?
Answers
Answer: Explanation:
Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun's energy into nutrients.
Help please? I'm really tired and I need help on this.
Answers
2( north and south pole) is magnet
3.electric
4. both
5 electric
6.magnet
2. magnet
3.electric
4. both
5 electric
6.magnet
A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J
Answers
Answer:
39,200J
Explanation:
just took the test
The meteor's potential energy if it has a mass of 10kg at an altitude of 400 m will be 39200 J
What is potential energy ?Potential Energy that depend upon the relative position of various parts of system . It is an energy possessed by an object by virtue of its position or configuration.
mass(m) = 10kg
g (acceleration due to gravity) = 9.8m/s^2
altitude(height (h)) = 400m
Meteor's Potential energy = m * g * h
= 10 * 9.8 * 400 = 39200 J
correct option will be a) 39200 J
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Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity
Answers
Answer:
C. Beats
Explanation:
When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Answer:
beats
Explanation:
got it right