A room with hard, flat walls surface is most likely to create an echo. Hence option A is correct.
What is echo?Echo is defined as a recurrence of sound caused by sound waves being reflected off of a wall, mountain, or other obstruction. Bats, dolphins, and fishermen all use echoes to find objects or obstructions. To find an obstruction, they are also utilized in SONAR (Sound navigation and ranging) and RADAR (Radio detection and ranging).
Buildings made of glass, metal, and concrete, the brick and metal interior of a warehouse, marble floors and buildings, or, if the room is designed in such a way that the acoustics produce an echo, plastered and painted interior walls, are examples of man-made materials that are smooth enough to produce an echo.
Thus, a room with hard, flat walls surface is most likely to create an echo. Hence option A is correct.
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You are asked to determine the identity of an unknown liquid and can only measure one physical property. You freeze the liquid and record that the liquid turns into a solid at 0 degrees C. Which physical property does this demonstrate?
melting point
boiling point
freezing point
volume
In many environments, the temperature of the ground and the air right above the ground are both very similar in the middle of the night. Engineers have proposed developing a portable pop-up hammock that would allow people to sleep suspended in the air above the ground in emergencies. It will take time and money to develop a really lightweight, easy to collapse, low cost design. Before they invest the resources to do this, explain whether what you learned about energy transfer makes this an idea worth pursuing. Would suspending a person in a hammock, wrapped in one of the blankets you chose above, decrease the amount of temperature change compared to sleeping directly on the ground with one of these blankets? Explain.
Answer:
yes i think so
Explanation:
Hammock is a good idea to reduce the effect of cold in night. It is more better than sleeping directly on the ground with one of these blankets, because, the heat will transfer from us to the cool ground which make us more cool.
What is heat transfer?Heat is able to transfer from the hotter region to colder region based on the temperature gradient. The temperature gradient occurs from the difference in heat radiated in each regions.
The convection current in air occurs due to this temperature gradient. During winter seasons, the colder grounds can absorbs the heat from our body and make us cool. Thus, contact with the ground in colder nights make us more cool.
The same advantage of air circulation around your body on warm nights is provided by a nylon hammock. Additionally, a cozy under blanket (like this one from Cedar Ridge or this one from Little Shop of Hammocks) will keep your backside warm when the weather drops.
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How is your eardrum similar to a real drum?
It vibrates.
It is unpredictable.
It produces sound.
It is hollow.
Answer:
it vibrates
Explanation:
drums vibrates to make noise, and ear drums vibrate from sound.
Answer:
it vibrates
Explanation:
i took this quiz
all are the following forms of energy EXCEPT:
(A)heat
(B)friction
(C)light
(D)electrical
Which statement below describes a physical property of a substance?
A. Helium gas floats because is less air dense than air
B. Sulfuric acid is a toxic liquid
C. Iron rusts when exposed to water and air
D. Sodium metal explodes when exposed to water
Answer:
A
Explanation:
Because density is a physical property and the rest are all chemical properties
Answer:
A
Explanation:
what is the acceleration of 1 m/s?
Answer:
Newton es la fuerza que provoca una aceleración de 1 m/s2 en un cuerpo de 1 kg. La segunda ley de Newton establece que la fuerza y la aceleración son directamente proporcionales, pero no hay que olvidar el efecto de la masa.
Explanation:
How do planets with larger masses apply greater gravitational forces on objects compared to planets with less mass?
⇒ Please answer in your own words
Answer:
it's bigger
Explanation:
it's bigger than the planet with less mass
Answer:
bigger.
because the bigger the plant is the less mass it has .
hope this helped you
What is the basic building block of all pure substances that make up matter in the world? A. atoms B. cells C. compounds
Answer:
a) Atoms
Explanation:
PLS ANSWER ASAP
Global winds affect weather patterns around the world. What are the names of the three types of global winds shown in the diagram?
A) A are polar easterly winds B are trade winds, and C are gulf winds.
B) A are north winds, B are prevailing westerly winds, and C are polar easterly winds.
C) A are north winds, B are west winds, and C are east winds.
D) A are polar easterly winds, B are prevailing westerly winds, and C are trade winds.
Answer:
answer is C!!
Explanation:
Jim thinks that he can throw a baseball six meters per second. What does the six meters refer to? (2 points)
a
The speed the baseball travels in six seconds.
b
The distance the baseball travels in one second.
c
The distance the baseball travels in six seconds.
d
The time it takes the baseball to travel one meter.
think about the statement "every decision has an environmental impact"?what decision do you make that add carbon dioxide to the environment?what decision do you make that would add less carbon dioxide to the environment then you currently add?
Explanation:
Certain actions and/or their method can affect the environment, such as leaving the sink on while brushing your teeth or not turning off a light when you leave the room. I personally make decisions to prevent my association with Greenhouse gases by turning off lights when I leave a room, using minimal water, recycling, etc.
Answer:
Answers may vary. View explanation.
Explanation:
There are every day decisions that may add carbon dioxide to the environment.
Problems:
Burning of fossils fuels. Example: Using cars as transportation. The average car releases around 4.6 metric tons of carbon dioxide per year.Deforestation. Carbon dioxide is released from dead organisms such as trees. Example: As of 2021, 15 billion trees are lost to deforestation.Solutions:
Instead of taking your car to work or school, carpool with a friend. Riding your bike and taking the bus are also good solutions that help minimize carbon dioxide releases.In spare your time, grab a couple of friends and plant some trees! Even planting just a few trees is a great start to help the planet.Have a great day!
Can you make some notes related to these texts?
Answer
Explanation:
ddssfdxfghfchgj
Pls, Help! 35 Points!
How can geothermal energy be used?
A fuel vehicles
B capture solar power
C power hybrid vehicles
D generate electricity
Answer:
generating electricity hope this helps have a nice day ;)
Explanation:
Answer:
d
Explanation:
1
Which of the following describes compounds?
a. are composed of two or more elements that are chemically combined
b. are random combinations of elements
c. are composed of elements that join in a specific ratio according to their masses
d. have the same characteristic properties as the elements that form them
Answer:
A
Explanation: The definition of a compound is two elements chemically connected
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Answer:
AAAAAAAAAAAAAAAAAAAAAAAAA
Answer:
A. 1.67×10^-24
Explanation:
Which option correctly describes the pattern of valence electrons on the periodic table?
O The number of valence electrons increases from right to left
O The number of valence electrons increases from bottom to top.
O The number of valence electrons increases from top to bottom
O The number of valence electrons increases from left to right.
Answer:
O The number of valence electrons increases from left to right.
Explanation:
In general, the number of valence electrons is the same within a column/group. When the group number increases, the # of valence electrons also increases.
The option correctly describes the pattern of valence electrons on the periodic table is the number of valence electrons increases from left to right. Thus, option D is correct.
What is atomic mass?In universe every particle have some mass associated with it whether it is small or large. According to Dalton's theory of atomic structure every particle is made up of with atoms. The average mass of atomic particle is called as atomic mass. This is commonly calculated as per international agreement in terms of a unified atomic mass (amu).
It can also be defined as 1/12 of the mass of a carbon atom-12 in its ground state. The mass of atom can also be calculated as the mass of protons and neutrons which almost equal to atomic mass. This small change is due to the binding energy mass loss.
Calculation:-
As per given above question:-
99% H-1
0.8% H-2
0.2% H-3
So,
Atomic mass = (99x1 + 0.8x2 + 0.2x3)÷100%
Atomic mass = 1 amu,
Therefore, The option correctly describes the pattern of valence electrons on the periodic table is the number of valence electrons increases from left to right. Thus, option D is correct.
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The atomic number of an element:
Question 2 options:
Tells you the mass of the atom
Tells you the number of energy levels there are around the atom
Tells you the identity of the atom
Tells you how many valence electrons the atom has
1) Would a person's weight on Earth be the same as it would be on the moon? Explain using the key words weight, mass & gravity.
Answer:
The force gravity exerts on a person determines the person's weight. Even though your mass would be the same on Earth and the moon, if you weigh 132 pounds (60 kilograms) on Earth, you would weigh about 22 pounds (10 kilograms) on the moon.
Explanation:
Show your appreciation by marking this as brainliest.
How large is a typical animal or plant cell? A. 1-100 millimeters B. 1 meter C. 10-100 nanometers D. 10-100 micrometers WILL MARK BRAINLEST Science
Answer:
10-100 micrometers
Explanation:
A dog whistle has a high frequency. What can you infer about the dog whistle?
It would be very loud.
It would have a high pitch.
It would have a high amplitude.
It would have a long wavelength.
Answer: It would have a high pitch.
Explanation: since the whistle has a high frequency, I can infer that it will have a high pitch.
Answer:
it would have a high pitch
Explanation:
like if u take a hearing test the sounds are usually high pitch
When this candle is burned it seems to disappear over a period of time. In actuality, the candle is being converted to smoke,ash, and carbon dioxide, and the energy is being released as heat and light. This is an example of _____________.
A. Murphy's law
B. the law of conservation of mass
C. the law of chemical reactions
D. the law of nature
What are the 3 properties of metals?
Answer:
lustrous durable highly malleableExplanation:
brainliest plz
Which of the following describes a mixture?
a. formed from two or more substances chemically combined
b. can be separated only by chemical means
c. made up of two or more substances that keep their identities
d. made up of two or more substances joined in a specific ratio
heeeeeeeeeeeeeeeeeellllllllllllllllllllllllppppp
Answer:
Atomic number = 42
Chemical symbol = Mo
Number of protons = 42
Atomic mass = 96
Number of electrons = 42
Number of valence electrons = 1
number of electrons in n=3 shell = 8
Number of neutrons = 54
hope this helps :)
Use the information and data from the tests to make a recommendation for which blanket the government should choose. In your response include scientific reasoning to support your recommendation.
Reasoning: Explain using scientific principles and connect the test results to the criteria and constraints.
Answer:
through the day yesterday and I was really hoping to see you and
pls help me with this pls don't just come to my question with out answering the questions
How do planets with larger masses apply greater gravitational forces on objects compared to planets with less mass?
Answer:
more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
A rock is taken from the Moon back to Earth. Which of the following correctly
describes the changes to its mass and weight?
a. Its mass has no change, and its weight decreases.
b. Its mass has no change, and its weight increases.
c. Its mass decreases, and its weight has no change.
d. Its mass increases, and its weight increases
The mass of the rock remains unchanged, and its weight increases.
What is Weight ?
Weight is the force exerted by the earth on an object at the surface of the earth. Mathematically -
W = m x g
where -
m is the mass of object
g is acceleration due to gravity
Given is a rock is taken from the Moon back to Earth.
Mass and weight are completely different from each other. Mass is the amount of matter present inside the body whereas weight is the force exerted by earth on any object on its surface. Mathematically -
W = mass x acceleration due to gravity
W = Mg
The ratio of Weight to mass is [g] (9.8).
W/M = g
Mass of a body remains constant throughout the universe but its weight depends upon the value of acceleration due to gravity of the environment of the planet or any other celestial body in which it exists. Hence, because of this only, the mass of rock remains same but its weight increases as it is brought back to earth since the acceleration due to gravity on earth is greater than that on moon.
Therefore, the mass of the rock remains unchanged, and its weight increases.
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Identify the form of energy.
mechanical energy
chemical energy
radiant energy
electrical energy
Answer:
Mechanical energy
Explanation:
Your body is doing most of the work
What kind of spider has red legs & a black body? I just saw this kind of spider past by my window-
Answer:
red legged purseweb spider
Explanation:
Will not cause death but still stay away if you are sensative to all spiders.
