In nature, hot air tends to rise and cool air tends to sink. This is behind the concept of convection heating that is used in ovens. Convection currents occur only in fluids such as liquids and gases but not in solids.
Which of the examples below is an example of convection?
A) rubbing your hands together.
B) heating a fish tank.
C) basking in the sun.
D) striking a match.
Answer:
BExplanation:
MODES OF HEAT TRANSFER
1) Conduction: This type of heat transfer happens when there is direct contact between the two object.
2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).
3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
A. Rubbing your hands together, is a type of energy transformation in which mechanical energy transforms to heat energy.
B. Heating a fish tank: Hot liquid tends to rise and cool liquid tends to sink and thus the fish tank heats.C. Basking in the sun: is a type of radiation as the sun energy is transferred through space.
D. Striking a match: is a energy transformation in which mechanical energy transforms to heat and light energy.
please make me brainlist
which cell structure is responsible for taking in and breaking down foreign particles and damaged organelles?
Answer:
lysosomes
Explanation:
While escaping from a building in which a fire is burning, 40 people pass through a smoky
room in which the CO volume fraction
1000 uL/L, the HCN volume fraction
uL/L, and the C02, volume fraction is
0.02. Despite some visible smoke in the
they cross the room in about 10 seconds.
Calculate the fractional effective dose of
narcotic gases each person has accumulated
and estimate whether all of them will make
to the exit door.
my bad i clicked the wrong question to do sorry i wish i could help but im dumb lol
In the center of the Milky Way galaxy is a
a
Black hole
b
Neutron star
C
Supernova
d Nebula
Answer:
A.Black hole
Explanation:
The Galactic Center is the rotational center of the Milky Way galaxy'; it is a supermassive black hole of 4.100 ± 0.034 million solar masses which powers the compact radio source Sagittarius A*
A compound composed of a metal and nonmetal is exposed to an electric current
attached to a light bulb. What do you expect should happen?
A.Light bulb turns on
B.Light bulb turns off
C.Light bulb flickers dimly
D.Light bulb gets colder
Answer:
A light bulb turns on
Explanation:
When a metal-nonmetal compound conducts electricity, the connected light bulb will turn on, indicating that the electric current is flowing through and the substance is an electrical conductor.
When a compound composed of a metal and nonmetal is exposed to an electric current and connected to a light bulb, the expected observation is that the light bulb will shine, indicating that the electric current is flowing through the compound. This implies that the substance being tested is an electrical conductor. Examples provided in the background information highlight that the flow of currents can lead to various results such as the warming of a wire in a circuit, which might lead to a continuous flow of electricity in the case of a thermocouple, or the attraction between warm and cold ends of a compound wire.
When a light bulb is connected in a circuit and current flows through it, the filament of the bulb heats up and emits light due to its resistance. In some cases, as with incandescent lights, this is not energy-efficient due to the heat produced. However, if the resistance in the circuit increases, we would expect the bulb to emit redder light, as the temperature of the filament would decrease, shifting the color spectrum towards the red end due to a decrease in energy emission.
Thus, for the choices provided, the answer would be A. Light bulb turns on, as long as the circuit remains closed and the substance allows for sufficient current to flow.
Modern dual-processing theory is the idea that our minds have —
tracks.
O
A. conscious and unconscious
O
B. emotional and rational
O
C. conscious and preconscious
O
D. subconscious and conscious
Answer:
conscious and unconscious
Explanation:
17. Which sound has the highest pitch? 156 Hz (hertz); 258 Hz (hertz); 14 dB (decibels): 563 dB
Answer:
258Hz
Explanation:
as 14 and 563 are measurings of decibels which are loudness. 156Hz is a lower pitch than 258Hz
The highest pitch among the given options is 258 Hz, as pitch is related to frequency. The higher the frequency, the higher the pitch. Decibels (dB) measure loudness, not pitch.
Explanation:The sound with the highest pitch among the options given, 156 Hz (hertz) and 258 Hz (hertz) is 258 Hz. Pitch is directly related to the frequency of the sound. The higher the frequency, the higher the pitch. Therefore, a sound wave with a frequency of 258 Hz is perceived as a higher pitch than one with a frequency of 156 Hz. However, the units dB (decibels) mentioned are units of loudness or intensity of the sound, not pitch, so they cannot be compared in terms of pitch.
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Which statement is true about the atom?
A: it contains positive electrons, uncharged protons and negative protons.
B: it contains uncharged neutrons, positive electrons and negative protons.
C: it contains negative electrons, uncharged protons and positive neutrons.
D: it contains negative electrons, positive protons and uncharged neutrons.
E: it contains negative neutrons, positive protons and uncharged electrons.
Answer:
Its d
atome contain
negative electrons,
positive protons and uncharged neutrons.
Explanation:
The correct statement about an atom is option D: it contains negative electrons, positive protons, and uncharged neutrons.
Explanation:Option D accurately characterizes the constituents of an atom, delineating the essential subatomic particles that define its structure. Electrons, carrying a negative charge, orbit the nucleus, which houses positively charged protons and neutrally charged neutrons.
The intricate interplay of these particles governs the atom's overall charge and stability. Understanding this composition is fundamental to delving into the complexities of atomic interactions and the diverse array of elements comprising the periodic table. In essence, the concise yet comprehensive depiction in option D provides a foundational insight into the fundamental components shaping the nature of atoms and their role in the vast landscape of chemistry.
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An important news announcement is transmitted by radio waves to people who are 82 km away, sitting next to their radios, and by sounds waves to people sitting across the newsroom, 4.7 m from the newscaster. Take the speed of sound in air to be 340 m/s.
What is the difference in time that the message is received?
Answer in units of ms.
Answer:
13.5 ms
Explanation:
The sound wave travels with uniform motion in both cases, so the time taken to cover a distance d is given by:
[tex]t=\frac{d}{v}[/tex]
where
d is the distance to cover
v = 340 m/s is the speed of sound in air
So for the people across the newsroom,
d = 4.7 m
So the time taken is
[tex]t=\frac{4.7}{340}=0.0138 s = 13.8 ms[/tex]
The radio waves instead travels with uniform motion at the speed of light:
[tex]c=3.0\cdot 10^8 m/s[/tex]
So the time taken for them is
[tex]t=\frac{d}{c}[/tex]
where
d = 82 km = 82,000 m
is the distance of the people who are 82 km away. Substituting,
[tex]t=\frac{82,000}{3.0\cdot 10^8}=0.27\cdot 10^{-3} s = 0.27 ms[/tex]
Therefore, the difference in time is
[tex]\Delta t = 13.8 ms - 0.27 ms = 13.5 ms[/tex]
1. The term acceleration was used in paragraphs 1-3. Which of the following could be a definition of acceleration?
A. A change in an object's speed
B. At object at rest
C. A change in an object's direction
D. Both A and C
The answer is
A. a change in an objects speed
D. Both A and C
definitions of acceleration
A change in an object's speed
A change in an object's direction
The velocity vector change during a time interval divided by the time interval is the definition of acceleration.
How does acceleration work?
The term "acceleration" refers to a change in an object's velocity with regard to time. The definition of velocity is the rate at which an object moves in a specific direction.
Examples
At a speed of 10 meters per second, something was heading north.An apple is tumbling to the ground.Jane is moving at a 3 kilometer per hour pace toward the east.Tom was moving at a 3 kph pace toward the east.Sally was moving at a 3 kph eastward pace.Gravitational accelerationTo learn more about "acceleration refer to:
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The diagram shows a transformer based on the diagram, the voltage of the secondary winding is ____
Answer:
60V
Explanation:
240V/12 loops = 20 volts per loop.
20 * 3 = 60 volts
Answer:
60VExplanation:
BRAINLIEST? plz
limited time, plz help
For every increase in mass, the gravitational force blank .
If the total mass increases by a factor of 4, the gravitational force blank .
Answer:
Newtons' law
Explanation:
Newton's law of gravitation: This law states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Answer:
For every increase in mass, the gravitational force
✔ increases by the same amount
.
If the total mass increases by a factor of 4, the gravitational force
✔ increases by a factor of 4
Question 1
Joseph is conducting an investigation on how two objects compare in mass, volume, and force with each other. When determining the
gravitational force between the two objects, which of the following characteristics of the objects should be considered?
Mass
Volume
State of matter
Shape
Joseph is conducting an investigation on how two objects compare in mass, volume, and force with each other. When determining the gravitational force between the two objects, the following characteristics of the objects should be considered :
MASS AND DISTANCE
Explanation:
The gravitational force is a force that attracts any two objects with mass. In fact, every object, including you, is pulling on every other object in the entire universe. This is called Newton's Universal Law of GravitationThe strength of the gravitational force between two objects depends on two factors, mass and distance. The force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.When two objects are gravitational locked, their gravitational force is centered in an area that is not at the center of either object, but at the barycenter of the system. The principle is similar to that of a see-saw.Gravity is often assumed to be the same everywhere on Earth, but it varies because the planet is not perfectly spherical or uniformly dense. In addition, gravity is weaker at the equator due to centrifugal forces produced by the planet's rotation.The gravitational force between two objects is determined by their masses and the force of gravity. The volume, state of matter, and shape of objects do not impact gravitational force, as it is the interaction of objects' masses that matter.
When determining the gravitational force between two objects, the characteristics of the objects that should be considered are their mass and the force of gravity that acts upon them. The volume, state of matter, and shape do not directly impact the gravitational force between objects. According to Newton's Law of Universal Gravitation, the force of attraction between two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Essential Knowledge in physics tells us that gravitational force describes the interaction of one object that has mass with another object that has mass. Therefore, it is the total quantity of matter—an object's mass—that influences the gravitational force. In contrast, the volume depends on the size of an object and its shape but does not affect gravity.
Garrick rubs an inflated balloon against his hair. He then touches the balloon against a non-conducting wall.
Which picture shows how the charge on the balloon and the wall are distributed?
Answer:
Figure A
Explanation:
At first, the inflated balloon is rubbed against the hair.
In this situation, the balloon is charged by friction: because of the friction between the surface of the balllon and the hair, electrons are transferred from the hair to the surface of the balloon.
As a result, when the balloon is detached from the hair, it will have an excess of negative charge (due to the acquired electrons).
Then, the balloon is placed in contact with the non-conducting wall.
The non-conducting wall is initially neutral (equal number of positive and negative charges).
Because the wall is made of a non-conducting material (=isolant), the charges cannot move easily through it. Therefore, even though the charges on the wall feel a force due to the presence of the electrons in the balloon, they will not redistribute along the wall.
Therefore, the charges on the wall will remain equally distributed, as shown in figure A.
which form of energy is due to an object's position or location
Answer:
Potential energy
Explanation:
Potential energy is the energy stored within an object, due to the object's position, arrangement or state. Potential energy is one of the two main forms of energy, along with kinetic energy.
Answer:
potential
Explanation:
an object with a mass of 6.0 kg accelerates 4.0 m/s^2 when an unknown force is applied to it. what is the acceleration?
Answer:
24 N
Explanation:
F=ma
F= 6 × 4 = 24 N
that's it.
which is the independent variable "year" or "degrees Celsius"?
Answer:
Year is the independent variable
Explanation:
Time is independent of everything else it does not depend on anything.
Degrees Celsius can depend on sunlight, rain, wind, etc. (other elements can determine what it will be)
During an observation, it was noticed that light travels as bundles containing certain amounts of energy. What does this evidence reveal about light?
A. It travels at a finite speed.
B. It demonstrates a behavior of particles.
C. It travels through the vacuum of space.
D. It demonstrates a behavior of forces.
During an observation, it was noticed that light travels as bundles containing certain amounts of energy. It demonstrates a behavior of particles. Hence, option (B) is correct.
What is photon?A photon is a tiny energy packet of electromagnetic radiation, also referred to as a light quantum.
The characteristics of photons can be summed up as follows in accordance with the photon theory of light:
Each photon possesses the speed of light, c, momentum (p = h v/c), and energy (E = hν).Since photons are electrically neutral, magnetic and electric forces have no effect on them.When radiation is absorbed or emitted, respectively, photons can be destroyed or generated.In a photon-particle collision, both the total momentum and the total energy are conserved.The energy of each photon of light has a specific frequency and wavelength.Photons have no mass while at rest.Learn more about photon here:
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The correct answer is B. It demonstrates a behavior of particles does this evidence reveal about light.
The observation that light travels in bundles, or quanta, containing certain amounts of energy is evidence of the particle-like behavior of light. This concept is a fundamental aspect of quantum mechanics and is described by the theory of quantum electrodynamics.
(PLEASE HELP) Which of the following is the name for two or more types of atoms that are chemically bonded together?
A. Compound
B. Colloid
C. Element
D. Solvent
Answer: A
Explanation:
Answer:
A compounds
Explanation:
Study the diagram. Point C identifies the _____ of the wave.
Point C identifies the trough of the wave. The highest point of the wave is the crest, while the lowest point is the trough.
What is wavelength?The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point known as the crest, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
Hence, point C identifies the trough of the wave.
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The buoyant force on an object is dependent on _____.
a. the shape of the object
b. the volume of the object
c. the mass of the object
d. the object’s density
PLEASE ANSWER ASAP THANKS!!
Answer:
d. The objects density
Explanation:
Density is the measure of how much an an object will sink or float in liquid or gas. The density of the liquid or gas is also a factor in how much the object will sink or float.
Can anyone help me with this?
Answer:
I Think The 1st One
Explanation:
Cause it makes sense
Hope it was Right
My mom and I walked 3,600 m in 90 minutes. What was our speed in m/min?
Which of the following types of electromagnetic radiation has the longest wavelength?
Answer:
Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.
Answer:
radio waves
Explanation:
When recyclable materials are sent to a recycling plant, they are often not sorted in any particular way. Plastic materials might be
mixed in with paper, iron, aluminum, and glass materials
Image courtesy of the U.S. EPA
Which of the following is a way that recycling plants separate iron materials from other materials without applying a contact force
to them?
A. by applying an impact force to the recycled materials
B. by sorting the materials with a robotic arm
C. by applying a magnetic force to the recycled materials
D. by sorting the materials by hand
Answer:
by applying a magnetic force to recycled materials
Answer:
by applying a magnetic force to recycled materials is the correct answer
Explanation:
Thomas gets on an elevator on the 1st floor. He goes up 8 floors. Then he
continues up 2 additional floors. Finally, he goes down 5 floors before leaving
the elevator. On what floor does Thomas get off?
O
A. 2nd floor
O
O
O
B. 16th floor
C. 15th floor
D. 6th floor
Use the drop-down menus to complete the statement.
The difference between an electric motor and an electric generator is that a motor converts
energy, while a generator converts
energy into
energy
energy into
The difference is that an electric motor converts electrical energy to kinetic energy while an electric generator converts kinetic energy into electrical energy
What is an electric motor?
An electric motor can be defined as an electrical machine that is designed and developed to convert electrical energy into kinetic energy, especially through electromagnetic induction.
What is an electric generator?An electric motor is also referred to as dynamo and it can be defined as an electrical machine that is designed and developed to convert kinetic energy into electrical energy, for use in an electric circuit.
In conclusion, the difference is that an electric motor converts electrical energy to kinetic energy while an electric generator converts kinetic energy into electrical energy.
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السلام عليكم ورحمة الله وبركاته
Answer:
1,3,3,1
electric, kinetic, kinetic eletric
Explanation:
The difference between an electric motor and and electric generator is that motor converts electric energy into kinetic energy, while a generator converts kinetic energy into electrical energy.
a driver's foot presses with a steady force of 20N on a pedal in a car as shown.
Answer:
160N
Explanation:
Moments must be conserved - so.
[tex]20 * 0.4 = F * 0.05[/tex]
[tex]F=\frac{20*0.4}{0.05} = 160[/tex]
A driver's foot presses with a steady force of 20 N on a pedal in a car, so the force F pulling on the piston is 160 N. Hence, option D is correct.
What is Force?A force in physics is an input that has the power to change an object's motion. A mass-containing object's velocity can vary, or accelerate, as a result of a force. Intuitively, a pushing or a pull can also be used to describe forces. Being such a vector quantity, a force does have magnitude and direction. The SI unit metric newton is used to measure it (N). The letter F stands for force.
According to Newton's second law's original formulation, an object's net force is equal to the speed that its momentum is changing over time.
From the given data in the question,
The momentum must be conserved,
20 × 0.4 = F × 0.05
F = (20 × 0.4)/0.05
F = 160 N
Therefore, the force is 160 N.
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Why are most volcanoes found where the Earth's crust has been broken?
A. Magma is hotter along these crusts and can melt any rocks above it.
B. There are more seismic waves that cause magma to rise to the surface.
C. The broken crust creates high pressure that causes magma to rise.
D. The broken areas of the crust provide an opening where magma can travel to the surface of Earth.
Answer:
the awnser to the question is Is C
Answer:
D. The broken areas of the crust provide an opening where magma can travel to the surface of Earth.
Explanation:
Which structures are found in both plant and animal cells, but are smaller and more numerous in an animal cell?
Answer:
the nucleus-hope it helps
Explanation: