Answer:
Infectious diseases can be spread through contaminated water. Some of these water-borne diseases are Typhoid, Cholera, Paratyphoid Fever, Dysentery, Jaundice, Amoebas and Malaria. Chemicals in the water also have negative effects on our health.
Explanation:
Final answer:
Water pollution adversely affects ecosystems, leading to harmful effects like eutrophication and dead zones. Pollutants can accumulate in the food chain affecting human health, and contaminated waterways can disrupt recreation and drinking water quality.
Explanation:
Water pollution has significant repercussions on ecosystems and can lead to broad ecological consequences, affecting water quality and the organisms residing in and around affected areas. Notably, the pollutants either from point sources or nonpoint sources can lead to a chain of detrimental events. An example of this is eutrophication, which is an over-enrichment of water bodies with nutrients leading to excessive growth of algae and subsequent depletion of oxygen (anoxia), causing harm to various aquatic species.
Furthermore, the pollution can result in the accumulation of harmful substances, like mercury, within the food web, which potentially leads to the consumption of carcinogens by animals—including humans. The effects of water pollution are far-reaching; contaminated rivers can negatively impact recreational activities, drinking water supplies, and the overall health of the ecosystem. Specific instances, such as the Cuyahoga River catching fire, underpin the urgent need for better water management policies to prevent such environmental crises.
Agricultural practices also contribute to water pollution with runoff carrying pesticides and fertilizers that can cause algal blooms, resulting in dead zones—areas in water bodies where life cannot be sustained due to low oxygen levels. These impacts are often not confined to a single locality but can affect regions downstream and ultimately contribute to global environmental problems.
What element is produced when the isotope bismuth-213 emits a beta particle
A) thallium (Tl)
B) Polonium(Po)
C) lead (Pb)
D) astatine(At)
Answer:
B) Polonium(Po)
4. What is the charge on the leaves of an electroscope if a negatively charged rod is moved near
the top of the electroscope? *
(10 Points)
A)Positive
B)Neutral
C)Negative
Answer:If you bring a negative object near the electroscope, the electrons in the scope will be repelled toward the leaves, balancing the charge. The leaves will move toward each other.
When the negatively-charged rod is brought close to the electroscope, positive charges are attracted to it and negative charges are repelled away from it.
This is called charging by conduction. Figure 2 (c) Charging by Conduction The negatively charged rod touches the knob on the electroscope. The result is a transfer of electrons from the rod to the knob, making the knob, rod, and gold foil all negative, and making the gold foil deflect from the vertical.
Explanation:
How does hydrosphere interact with geosphere?
Answer:
In both locations pictured here, the hydrosphere is the main agent responsible for eroding or breaking down the geosphere (rocks). Differences in the amount of precipitation each area receives and the state of the water (liquid or solid) where it contacts rocks result in different kinds of erosion and landforms
Explanation:
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The hydrosphere interacts with the geosphere through processes like erosion, weathering, and the formation of landforms.
Explanation:The hydrosphere, which refers to all of the water on and below the Earth's surface, interacts with the geosphere through various processes. One example is the erosion of land by water, where rivers and streams carry sediment and deposit it in new locations, shaping the Earth's surface. Another example is the weathering of rocks by water, where water seeps into cracks and breaks down rocks over time. Additionally, the hydrosphere and geosphere interact through the formation of landforms such as oceans, lakes, and mountains.
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3. What is the charge on the leaves of an electroscope if a positively charged rod is moved near the
top of the electroscope? *
(10 Points)
A)Positive
B)Neutral
C)Negative
ASAP pls will mark brainiest
How much current will a 500 W vacuum cleaner draw if it has a resistance of 30Ω?
Answer:
Electric current, I = 4.08 A
Explanation:
We have,
Power of vacuum cleaner is 500 W
Resistance of vacuum cleaner is 30 ohms
It is required to find the current flowing through the vacuum cleaner. It can be calculated using the definition of power delivered. Its formula is given by :
[tex]P=I^2R[/tex]
I is electric current
[tex]I=\sqrt{\dfrac{P}{R}} \\\\I=\sqrt{\dfrac{500}{30}} \\\\I=4.08\ A[/tex]
So, the electric current flowing through the vacuum cleaner is 4.08 A.
1. A negatively charged rod is moved near the top of a positively charged electroscope. What
happens to the leaves of the electroscope?
(10 Points)
A)Move closer together
B)Move further apart
C)No change
Answer:
A) Moves closer together
What is a scientific law?
A. The best explanation of what science has to offer
B. A description of what happens in nature
C. A testable statement of experimental results
D. A question that can be answered by observation
Answer:
A.
Explanation:
How many times louder is the intensity of
sound at a rock concert in comparison with
that of a whisper, if the two intensity levels
are 130 dB and 2 dB, respectively?
Answer: the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.
Explanation: Given that sound at a rock concert power is 130 dB of intensity l2
a whisper power is 2 dB of intensity l1
Using the formula
130dB - 2dB = 10Log(I2/I1)
128/10 = logI2/I1
12.8 = log (I2/I1)
I2/I1 = 6.31 × 10^12
Therefore, the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.
The sound at a rock concert is approximately 630,957,344 times louder than a whisper, as decibels (dB) are a logarithmic unit of sound intensity.
Explanation:To compare the loudness of two sounds, we first need to understand that decibels (dB) are a logarithmic measure of sound intensity. A difference of 10 dB signifies a 10-fold increase in sound intensity. Therefore, the difference between the two sound intensities in this case - the rock concert's 130 dB and the whisper's 2 dB - is 128 dB. To convert this into times louder, we would divide the difference by 10[tex](128/10 = 12.8)[/tex] and then use that result (12.8) as a power of 10. Hence, the amplitude of the sound at a rock concert is approximately 630,957,344 times louder than that of a whisper.
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What are the four types of musical instruments and what are the physical behind each type of musical instrument
Answer:
The four types of musical instruments are percussion, woodwind, brass, and strings.
Explanation:
Percussion instruments include drums, triangle, cymbals, and xylophones. There are more instruments than what i've mentioned though. Percussion instruments often produce the beat of songs.
Woodwind instruments include clarinets, oboe, flute, and saxophone. Woodwind instruments often produce the harmony of songs and, occasionally, the melody.
Brass instruments include trumpet, trombone, french horn, and tuba. Brass instruments often produce the harmony of songs, the trumpet produces the melody a lot though.
String instruments include guitars, violins, cello, bass, ukulele, and banjo. String instruments produce both the harmony and the melody. These instruments often produce really beautiful music, in my opinion.
The four types of musical instruments are aerophones, chordophones, membranophones, and idiophones.
Explanation:The four types of musical instruments are:
Aerophones (wind instruments): These instruments create sound by using air as the main component. Examples include flute, trumpet, and saxophone.
Chordophones (stringed instruments): These instruments produce sound by vibrating strings. Examples include guitar, violin, and piano.
Membranophones (instruments with a membrane): These instruments create sound by using a vibrating membrane. Examples include drums and tambourines.
Idiophones (self-sounding instruments): These instruments produce sound through their own vibrations. Examples include xylophone, maracas, and cymbals.
FAST ANSWERS I NEED HELP FASTT
Sunbathers warming up in the bright sun is what type of thermal energy transfer?
Question 6 options:
conduction
rarefraction
convection
radiation
Which of the following is the method by which air is cooled in the food storage component of a refrigerator?
Question 18 options:
Evaporation
Radiation
Conduction
Convection
Answer: Convection :)
Answer:
D. Convection
Explanation:
The air inside the refrigerator is cooled by convection, which circulates colder air around the food and warmer air out of the refrigerator.
A person rubs her hands together and they heat up
• kinetic energy
• light energy
• sound energy
• electrical energy
• chemical energy
• heat energy
(multiple choice)
Answer:
Kinetic and heat energy (heat as thermal)
Explanation:
The friction of the rubbing builds up the energy, so it cant be the types of energy like light or sound
The molecules on pathogens that enable the immune system to distinguish one kind of pathogen from another are called _____.
T molecules
B molecules
antibodies
antigens
Answer:
I think the answer would be antigens
Explanation:
If a spring stores 5 J of energy when it's compressed by 0.5 m, what is the
spring constant of the spring?
O
A. 800 N/m
O
B. 80 N/m
O
c. 40 N/m
O
D. 400 N/m
Answer:
c. 40 N/m
Explanation:
EE = ½ kx²
5 J = ½ k (0.5 m)²
k = 40 N/m
Question 8
Handividual was rotating a cork on a string around his or her head, and suddenly released the string the cork would fly off in a straight line in one direction. This is an example of which of the following
A Newton's first law of motion
B
Newton's second law of motion
C
Newton's third law of motion
D
Newton's fourth law of motion
Answer:
A hope this helps
Explanation:
Final answer:
The cork flying off in a straight line after being released exemplifies Newton's first law of motion, which states that an object will continue at a constant velocity unless acted upon by an external force.
Explanation:
The scenario described where a cork flies off in a straight line after being released from circular motion is an example of Newton's first law of motion. This law, also known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. In the case of the cork, once it is no longer constrained by the tension of the string (which provides the centripetal force necessary for circular motion), it continues in a straight line (the tangent to the circle at the point of release) because there's no other force acting on it to change its state of motion.
In contrast, Newton's second law focuses on how the acceleration of an object is related to the forces acting on it and its mass. Newton's third law deals with action-reaction force pairs, stating that for every action there is an equal and opposite reaction. The concept of a fourth law of motion does not exist in Newtonian physics, which includes only three laws of motion.
A box contains about 5.54 1021 hydrogen
atoms at room temperature 21°C.
Find the thermal energy of these atoms.
Answer in units of J.
Answer:[tex]E=33.71\ J[/tex]
Explanation:
Given
No of atoms of hydrogen [tex]N=5.54\times 10^{21}[/tex]
Temperature of room [tex]T=21^{\circ}\approx 294\ K[/tex]
Thermal energy of the atoms is given by
[tex]E=\frac{3}{2}NkT[/tex]
where k=boltzmann constant
[tex]E=\frac{3}{2}\times 5.54\times 10^{21}\times 1.38\times 10^{-23}\times 294[/tex]
[tex]E=33.71\ J[/tex]
Hence the energy of the atoms is [tex]33.71\ J[/tex]
Final answer:
The thermal energy of hydrogen atoms at 21°C can be calculated using the average kinetic energy per atom, which is determined by the equipartition theorem (⅒kT), and multiplying it by the total number of atoms in the sample.
Explanation:
To find the thermal energy of hydrogen atoms in a sample at room temperature (21°C), we need to use the equation for the average kinetic energy per molecule due to thermal motion, which is given by the equipartition theorem. The equipartition theorem states that each degree of freedom contributes (⅒)kT to the energy, where k is Boltzmann's constant (1.38 × 10⁻²³ J/K) and T is the temperature in Kelvin. For monoatomic gases like hydrogen as atoms, they have three degrees of freedom (translational motions along x, y, and z axes).
First, convert the given temperature from degrees Celsius to Kelvin: T(K) = 21°C + 273.15 = 294.15 K.
Then, calculate the average kinetic energy per hydrogen atom: KE_avg = (⅒)kT.
Finally, multiply the average kinetic energy by the number of atoms to get the total thermal energy: Thermal Energy = KE_avg × number of atoms. Don't forget, the 'number of atoms' given in the question is in scientific notation, where 5.54 × 10²¹ actually means 5.54 times 10 raised to the power of 21.
Therefore, Thermal Energy = (⅒) × (1.38 × 10⁻²³ J/K) × 294.15 K × 5.54 × 10²¹ atoms.
When you calculate the above expression, that will give you the thermal energy of the hydrogen atoms in Joules.
Thick rubber gloves prevent electric shock because
Answer:
Rubber is an insulator.
Explanation:
Rubber is an insulator. Electricity will always travel "the path of least resistance." Rubber has a very high resistance, so electricity will go somewhere else to find ground.
4. The blades on a fan have a frequency of 15 Hz.
a) How many cycles do the blades complete in five minutes?
b) What is the period for the fan blades?
c) How long would it take for the fan blades to complete 100 revolutions?
Answer:
a) 4500 cycles b) 0.0667s c) 6.67s
Explanation:
a) 15 Hz= 15 cycles/ s
5 mins= 300s
15 cycles/s * 300s= 4500 cycles
b) Period= 1/ frequency
Period= 1/ 15 cycles/s
Period= 0.0667s
c) Period * number of revolutions= time
0.0667 * 100= 6.67s
A serving of french fries
releases 320 kcal (1 kcal =
4.18 kJ) when digested by your
body. If this same amount of
energy were transferred to 1.5
kg of water at 30°C, what
would the final temperature
Answer:
Explanation:
320 k Cal = 320 x 4.18 k J
= 1337.6 kJ
For rise in temperature the formula is
Q = m s Δ T
Q is heat added , m is mass of the water to which heat is added , s is specific heat of water , Δ T is rise in temperature .
1337.6 x 10³ = 1.5 x 4.18 x 10³ x Δ T ( specific heat of water is 4.18 kJ per kg.)
ΔT is more than 70 degree . That means , heat is sufficient to boil it .
So final temperature will be 100 degree Celsius.
Why is the United States considered a multiethnic country?
O
A. Because many people in the United States were born in other
countries
O
B. Because many religions are practiced in the United States
O
C. Because many languages are spoken in the United States
O
D. All of the above
Answer:
I would say the correct answer is Option D
Explanation:
The united states not only has freedom of religion, but also the ability to become a naturalized citizen if you're an immigrant. Because of this we live in a very diversely populated country both racially as well as religously which overall means ethnically but hey, what do i know?
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a cast iron paperweight is in the shape of a half-sphere with a diameter of 8.2cm. The cast iron has a density of 7.3g/cm^3. What is the mass of the paperweight, in grams?
a. 16860
b.8430
c.1054
d.2107
Answer: C
1054 g
Explanation:
Given that the object is in the shape of semi sphere with diameter of 8.2cm. And density of 7.3g/cm^3.
From definition of density,
Density = mass/volume
Volume of a half - sphere = 2/3πr^3
Volume = 2/3 × 3.143 × 4.1^3
Volume = 144.35 cm^3
Let make mass the subject of formula
Mass = Density × volume
Mass = 7.3 × 144.35
Mass = 1053.74g
The mass of the paperweight, in grams is 1054
How does the valence of the element relate to its chemical activity ?
The amount of electrons inside an atom's outer shell governs the chemical reactivity and ability to bind with other elements, and this relationship between an element's valence and chemical activity can be seen.
What is valency?In chemistry, an element's valence—also called valency—determines the number of other atoms that an atom of the metal can combine with.
The phrase, which was first used in 1868, is used to indicate both the broad power of a combination of elements and its numerical value. For 19th-century chemists, the explanation and systematization of valence presented significant difficulties.
The majority of the work was on developing empirical rules for finding the connotations of the elements because there was no good hypothesis explaining its source.
For 19th-century chemists, the explanation and systematization of valence posed significant difficulties. The majority of the effort was focused on developing empirical guidelines for finding the electron orbitals of the components because there was no good theory for its cause.
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Sound is an example of ?
a. a longitudinal wave.
b. a wave that can travel through a vacuum.
c. a transverse wave.
d. a wave that does not transmit energy.
Sound is a longitudinal wave, where the particles vibrate back and forth in the direction the wave is moving. It cannot travel in a vacuum as there are no particles to transmit the wave.
Explanation:Sound is an example of a longitudinal wave. This is because, in a longitudinal wave, the motion of the particles in the wave is in the same direction as the motion of the wave itself. When you speak for example, your voice creates a sound wave which makes the particles in the air vibrate back and forth in the same direction as the sound is traveling. On the contrary, transverse waves have particles that vibrate at a right angle to the direction of the wave, and the propagation of sound is not possible in vacuum (space devoid of matter) as there are no particles to vibrate and transmit the sound wave.
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Taking into account the chemistry and physics of fire, what can be done to reduce the risk of fire spread in a building?
Final answer:
To reduce the risk of fire spread in a building, it is essential to install fire sprinkler systems and ensure minimum levels of security. Material choice, space planning, regular maintenance, proper storage, and adherence to fire safety procedures are all critical measures. Safe evacuation practices and fire suppression innovations also contribute to fire safety.
Explanation:
Reducing the Risk of Fire Spread in a Building
Taking into account the chemistry and physics of fire, several strategies can be implemented to reduce the risk of fire spread in a building. One crucial element is the installation of minimum level of security and fire sprinkler systems, which can provide an immediate response to a fire, potentially containing it or putting it out before it spreads. A solid understanding of the fire triangle (oxygen, fuel, and ignition source) informs that limiting any of these can help prevent fires.
Additionally, using materials with low flammability for construction and interior design, as well as careful planning of space to avoid fuel load concentration, can greatly reduce the risk of fires. Regular inspections and maintenance of electrical systems, proper storage of flammable materials, and the implementation of smoke detectors and alarms are vital. Fire safety education and clear procedures for evacuation are equally important to ensure the safety of individuals in case of a fire. Furthermore, innovative solutions such as fluorinated foams can help extinguish fires more efficiently when they occur.
What is the main idea behind the law of definite proportions?
Answer:
The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.
Explanation:
Which equations represent the relationship between wavelength and frequency for a sound wave? Check all that apply.
v = lambdaf
A = vf
f = v
A = StartFraction v over f EndFraction.
A = StartFraction f over v EndFraction.
f = StartFraction v over f EndFraction.
f = StartFraction lambda over v EndFraction.
Answer:
A,D,F
Explanation:
The equations that represent the relationship between wavelength and frequency for a sound wave are:
v = lambdaf
A = StartFraction v over f EndFraction.
f = StartFraction v over f EndFraction.
What are Frequency and Wavelength?Frequency and wavelength are inversely proportional to every other. The wave with the greatest frequency has the shortest wavelength. two times the frequency manner one-1/2 the wavelength, for this reason, the wavelength ratio is the inverse of the frequency ratio.
In physics, the wavelength is the spatial period of a periodic wave—the space over which the wave's shape repeats. It's far the gap between consecutive corresponding factors of the same phase at the wave, including two adjacent crests, troughs, or zero-crossings, and is a function of each journeying wave and standing waves, as well as other spatial wave styles.
The inverse of the wavelength is called the spatial frequency. Wavelength is normally unique with the aid of the Greek letter lambda (λ). The term wavelength is also every now and then implemented to modulated waves, and to the sinusoidal envelopes of modulated waves or waves shaped via interference of numerous sinusoids.
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Which type of bond shows two or more atoms sharing electrons?
A.iconic B.covalent. C. Equal
Answer:
Covalent
Explanation:
Took the test and got it right :)
A covalent bond is a type of bond where two or more atoms share electrons.
Explanation:The type of bond that shows two or more atoms sharing electrons is covalent.
A covalent bond is formed when two or more atoms share electrons in order to achieve a stable electron configuration. These shared electrons are found in the outermost energy level of the atoms involved.
For example, in a water molecule (H2O), each hydrogen atom shares its electron with the oxygen atom, resulting in a covalent bond.
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What type of magnetism is present in a bar magnet?
A. Superconducting
B. Contact
C. Induced
D. Permanent
Answer:
It is made up of iron, steel or any other ferromagnetic substance or ferromagnetic composite, having permanent magnetic properties. The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.
The type of magnetism present in a bar magnet is permanent. The correct option is D.
What is magnet?A substance which is negative charged at one end and positive charged at another end creating the magnetic field around it.
A bar magnet also has magnetic fields around it. In the presence of magnetic force fields, any magnetic object will be attracted to it.
It is made up of iron or steel or any other ferromagnetic substance which have permanent magnet properties.
The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.
So, the type of magnetism present in a bar magnet is permanent.
Thus, the correct option is D.
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Whose contributions to astronomy explained how planets were held in their orbits?
A. Aristotle
B. Copernicus
C. Ptolemy
D. Newton
E. Brahe
F. Kepler
Answer:
D newton
Explanation:
he did extensive research on gravity, and gravity is what holds planets in orbits.