Answer:
Convection occurs when thermal energy is transferred by the movement of fluid particles.
Explanation:
Transfer of heat energy by the movement of fluid particles is called convection. Convection takes place in liquids and gases due to kinetic energy. When heat is provided to liquids and gases they expand and move faster.
Molecules with higher kinetic energy become less dense and rise up to the surface of liquid, whereas molecules with lower energy move towards the bottom. This up and down movement of molecules causes convection currents in fluids.
Answer:
Convection occurs when thermal energy is transferred by the movement of fluids.
Explanation:
Convection is one of the three forms of heat transfer (conduction, convection and radiation) that transports heat between zones with different temperatures. Convection itself is the transport of heat through the movement of fluid. For example, when heating water in a saucepan, the water in contact with the base of the pan rises, while the water from the surface descends and occupies the place left by the hot one.
a table with mass 23.5 kg sits on the ground what is the normal force on the table?
a-176 N
b-442 N
c-230 N
d-23.5 N
Answer:
C
Explanation:
There are two forces on the table: weight and normal force. Newton's second law:
∑F = ma
N - mg = 0
N = mg
N = (23.5 kg) (9.81 m/s²)
N = 230 N
The normal force on the table is 230N. The correct option is c.
What is a normal force?The normal force is the force acting on the object of mass m perpendicular to the contacting surface and the support.
Normal force N = mass x gravitational acceleration.
N =mg
Given is the mass of table ,m = 23.5 kg , then the normal force will be
N = 23.5 kg x 9.81 m/s²
N = 230.535N
Thus, the normal force is approximately 230N. The correct option is c.
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Two springs have different spring constants. How could you identify the spring with the greater spring constant value?
A.It will be shorter than the other.
B.It will be stiffer than the other.
C.It will be wider than the other.
D.It will have more mass than the other.
Answer:
B.It will be stiffer than the other. - I JUST DID THE QUIZ ON PLATO AND IT WAS CORRECT.
Explanation:
whithin which type of system is neither the total mass nor the total energy conserved ?
a. open
b. connected
c. isolated
d. closed
Answer:
a. open.
Explanation:
Open System:
A system that has external interactions is called an open system. In natural sciences an open system is the one whose border is permeable to both energy and mass. In thermodynamics a closed system, by contrast, is permeable to energy but not to matter.
As there are external interactions, the open system might lose/gain energy as well as matter.
Answer:
closed
Explanation:
Aristotle believed which of the following to be true?
1. Gravity is as important as religion.
2. earth is the center of the universe.
3. Everything can be scientifically explained.
4. The jet stream is why bodies fall differently.
Answer:
number 2
Explanation:
An object rolls off a tabletop with a horizontal velocity v0x = 2.2 m/s. The table is at a height y0 = 0.65 m, above the floor. Use a coordinate system with its origin on the floor directly beneath the point where the object rolls off the table, its horizontal x-axis lying directly beneath the object’s trajectory, and its vertical y-axis pointing up.
Find the angle of impact, in degrees below the horizontal.
To find the angle of impact in degrees below the horizontal, use the equations of motion to find the time of flight and horizontal distance the object covered when it rolled off the table, then apply those values to the equation for determining the angle of impact.
Explanation:The subject at work here is Physics, more specifically the domain of kinematics. The angle of impact, in degrees below the horizontal, can be found using the equations of motion.
First, we'll need to find the projectile's time of flight using the equation: t = sqrt((2*y0)/g), where y0 = 0.65 m is the height of the table and g = 9.81 m/s² is acceleration due to gravity. This will give you the time.
Next, we can determine the horizontal distance covered by the object using the equation x = v0x * t, where v0x = 2.2 m/s is the initial horizontal velocity.
Finally, we can find the angle of impact using the equation θ = arctan((v*t)/x), where v is the initial vertical velocity (which should be zero as the object rolls off horizontally), t is the time of flight, and x is the horizontal distance. We finally convert the calculated angle from radians to degrees to get the answer.
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A rock is dropped from rest. How fast is it going after it has been falling for 9.2 s?
90.2 m/s. A rock dropped from rest after it has falling for 9.2 seconds will have a velocity of 90.2m/s.
The bodies left in free fall increase their speed (downwards) by 9.8 m/s² every second. The acceleration of gravity is the same for all objects and is independent of the masses of these. In the free fall the air resistance is not taken into account.
v = g*t
v = (9.8m/s²)(9.2s) = 90.2 m/s
A beam of monochromatic light (f = 5.09 ×1014 Hz)
has a wavelength of 589 nanometers in air. What
is the wavelength of this light in Lucite?
Answer:
393 nm
Explanation:
The index of refraction of lucite is:
n = 1.50
The speed of light in lucite is given by:
[tex]v=\frac{c}{n}=\frac{3\cdot 10^8 m/s}{1.50}=2\cdot 10^8 m/s[/tex]
where c is the speed of light in a vacuum.
The wavelength of the light in Lucite is given by
[tex]\lambda=\frac{v}{f}[/tex]
where
[tex]v=2\cdot 10^8 m/s[/tex] is the speed of light in Lucite
[tex]f=5.09\cdot 10^{14}Hz[/tex] is the frequency
Substituting,
[tex]\lambda=\frac{2\cdot 10^8 m/s}{5.09\cdot 10^{14} Hz}=3.93\cdot 10^{-7} m = 393 nm[/tex]
Final answer:
To find the wavelength of a monochromatic light in Lucite, the given wavelength in air is divided by the refractive index of Lucite. Using the provided frequency and original wavelength, we determine the wavelength of the light in Lucite is approximately 393.7 nm.
Explanation:
A student has asked about the wavelength of monochromatic light with a frequency of 5.09 × 1014 Hz and a wavelength of 589 nanometers in air, when it passes through Lucite. To solve for the wavelength of light in Lucite, it is important to understand that the speed of light in a material is slower than in a vacuum, which directly affects the wavelength of the light in that material. The refractive index of Lucite is approximately 1.496, and using the formula for refractive index, n = c/v (where c is the speed of light in vacuum and v is the speed of light in the material), and the relationship between speed, frequency, and wavelength (λ), v = λf, we can rearrange these to find the wavelength in Lucite. We start with the basic relation in vacuum, c = λ_0f, to find the original speed of light through air (which is approximately equal to c), and then apply the refractive index to find the new wavelength in Lucite: λ = λ_0 / n. Applying the given values, the wavelength in Lucite becomes 589 nm / 1.496, which equals approximately 393.7 nm.
A group of organs that work together towards achieving one goal or completing one process is called a(n) ____________.
Answer:
Organ system
Explanation:
A group of organs that work together to perform a certain task
A group of organs that work together towards achieving one goal or completing one process is called an Organ system.
Explanation:
The organ system is the system which consists of the group of organ which has been assembled or grouped together to perform a particular course of action or simply say a task. There are many organ system in a human body.
For example, reproductive system, digestive system, excretory system. Here the reproductive system perform a particular task of reproduction, and so does the digestive system for the digestion and the excretory system for the excretion of waste.
A 64-kg person riding on a roller coaster starts at rest and reaches a final speed of 26 m/s at the bottom of its first hill. What is the roller coasters height?
Answer:
34.5 m
Explanation:
According to the law of conservation of energy, the mechanical energy of the person at the top of the hill must be equal to the mechanical energy at the bottom. However:
- the mechanical energy at the top is just gravitational potential energy, since the person is at rest, so the kinetic energy is zero
- the mechanical energy at the bottom is just kinetic energy, since the height of the person has becomes zero
So, the initial gravitational potential energy of the person must be equal to the final kinetic energy of the person:
[tex]U=K[/tex]
[tex]mgh = \frac{1}{2}mv^2[/tex]
where
m = 64 kg is the mass of the person
g = 9.8 m/s^2 is the acceleration due to gravity
h is the initial height of the roller coaster
v = 26 m/s is the final speed
Solving for h,
[tex]h=\frac{v^2}{2g}=\frac{(26 m/s)^2}{2(9.8 m/s^2)}=34.5 m[/tex]
GUESS WHAT?? I'LL MAKE YOU BRAINLIEST! PLEASE ANSWER THIS QUICKLY!
Which of the following characteristics do all of the outer planets have in common?
A) They have many moons.
B) They are small and solid.
C) They rotate slowly and are large and solid.
D) They rotate quickly and are large and gaseous.
Answer:
The correct answer is actually D) They rotate quickly and are large and gaseous.
Think about the features of the outer planets.
I got this question wrong because of the previous user that answered this.
here is proof that my answer is correct:
what is the position of the earth when the sun rises to its lowest midday position in the sky in the northern hemisphere and the southern hemisphere?
Final answer:
The Earth's position when the Sun reaches its lowest midday position in the sky is during the winter solstice. In the northern hemisphere, this occurs on December 21 or 22, and in the southern hemisphere, it occurs on June 20 or 21, both being the result of the tilt of Earth's axis.
Explanation:
The position of the Earth when the Sun rises to its lowest midday position in the sky in the northern hemisphere occurs during the winter solstice, which takes place on December 21st or 22nd. At this time, the Earth's axis of rotation is tilted away from the Sun, resulting in the Sun rising the most south of east, setting the most south of west, and taking its lowest and shortest path across the sky. This results in the shortest day and the longest night of the year for the northern hemisphere.
In contrast, for the southern hemisphere, the situation is reversed. The lowest midday position of the Sun occurs around June 20th or 21st, during their winter solstice. In this case, the Earth's axis is tilted such that the southern hemisphere is pointed away from the Sun, and thus the Sun takes a low arc across the sky, resulting in short days and long nights for that hemisphere.
PLEASE ANSWER FIRST GETS BRAINLIEST
What happens if a magnet is moved back and forth inside a coil of wire
A. The magnet becomes electrified
B. The coil becomes magnetized
C. The magnet loses its magnetism
D. The coil gains an electrical current
Answer:
I think it's d. The coil gains an electical current
Explanation:
A boat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. If the river is flowing with a velocity of 2.5
meters/second in the same direction as the boat. What would be the magnitude of the boat's velocity?
A.
16.5 meters/second
B.
20.5 meters/second
c.
18 meters/second
D.
2 meters/second
E.
45 meters/second
Answer:
B
Explanation:
The boat's velocity relative to the earth = the boat's velocity relative to the river + the river's velocity relative to the earth
v = 18 m/s + 2.5 m/s
v = 20.5 m/s
how much hereditary information is contain in a human sex cell
Answer:
one-half the amount
Explanation:
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A screw incorporates which other simple machine?
lever
wheel and axle
inclined plane
pulley
Answer:
Inclined plane.
Explanation:
Geometrically, a screw is a narrow inclined plane that is wrapped around a cylinder. Like the other simple machines a screw can amplify force; a small rotational force (torque) on the shaft can exert a large axial force on a load.
A screw is a cylinder with a head (solid top) at one end and a pointed tip (like a nail) at the other end.
The mechanical advantage of the screw depends on the space between the threads and the length (and thickness) of the screw. The closer the threads are, the greater the mechanical advantage. It is easier to drive a screw into an object if the thread spacing is smaller.
Answer:
Inclined Plane
Explanation:
A screw incorporates which other simple machine?
lever
wheel and axle
inclined plane
pulley
How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential?
A.
The kinetic energy increases.
B.
The kinetic energy decreases.
C.
The kinetic energy remains the same.
D.
The kinetic energy is always zero.
Answer:The kinetic energy will decrease.
Explanation:As potential energy increases kinetic energy will increase, as kinetic or potential energy decreases, the kinetic or potential energy will decrease
_____ are formed where bumps from two surfaces come into contact ?
Answer:
the answer would be microwelds.
It is possible a tree could fall down, even if no one did anything to it. A. True B. False
Answer: Yes
Explanation: To answer this, consider the natural processes that can cause a tree to fall, such as decay, disease, or adverse weather conditions. Trees can fall due to natural factors like rotting of the roots or trunk, strong winds, or heavy snow. Therefore, it is possible for a tree to fall down without any external force acting on it.
Which of the following are forms of phase changes
A. freezing
B. condensation
C. heating
D. exchanging
Answer:
I think it would be exchanging sorry if it's wrong
In the equation Q=mcΔT,Q represents
A.) The mass substance being heated
B.) The thermal energy
C.) The specific heat of the substance being heated
D.) Temperature measured in degrees C
Answer:C
Explanation:
The specific heat capacity of the substance
In the equation Q=mcΔT, Q represents the specific heat of the substance being heated.
What is the heat capacity formula?The heat Capacity formula is expressed as the product of mass, specific heat, and change in the temperature which is mathematically given as:Q = mcΔT
Where,
Q = capacity in Joules
m = mass in grams
c = specific heat of an object in J/g °C
ΔT = change in the temperature in °C
The heat capacity problem can be applied to calculate the heat capacity, mass, or temperature difference of any given substance.Heat Capacity is described in Joule per Kelvin (J/K).So, Option C is the answer.
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which represents one dimensional motion
a) two vectors that lie along the same line
b) any two vectors
c) one scalar and one vector
d) two scalars that go in opposite directions
One dimensional motion is represented by movement along a straight line. The best choice from the options provided is 'two vectors that lie along the same line', as the vectors portray both magnitude and direction of the motion.
Explanation:In context of physics, one dimensional motion is represented by movement along a straight line in one direction. The best representation of one dimensional motion from your options is 'a) two vectors that lie along the same line'. In this case, vectors represent both magnitude (amount of motion) and direction (in which way the motion is). If two vectors are lying along the same line, it indicates that the motion is taking place along one dimension (line), either in the same direction or in the opposite direction.
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If a toy has a mass of 1 kg, it has an Earth weight of
Answer:
The answer is 9.8 N
Explanation:
As we know that the weight of an object is the amount of gravitational force acting on the object in an upward direction if the weight is acting is the downward direction.
The formula of weight:
W = Mass x Gravitational force
W = m x g
Given data:
Mass =1 kg
g = 9.8 ms-2
W = 1kg x 9.8 ms-2 = 9.8 kgms-2 ( 1 kgms-2 = N)
SO,
W = 9.8 N
The toy has an earth weight of 9.8 N.
Which lists the organs in the correct order as food passes from the mouth to anus?
Answer:
The digestive process:
Mouth
Esophagus
Stomach
Small intestine
Pancreas
Liver
Large intestine
Explanation:
The digestive system is made up of the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.
Final answer:
The correct order of the digestive organs as food passes from the mouth to the anus is mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. Accessory organs aid digestion but do not directly contact food.
Explanation:
The digestive system includes several major organs through which food travels from the mouth to the anus. To answer both review questions provided, here is the correct sequence of the digestive organs along the gastrointestinal tract, starting with the mouth:
MouthEsophagusStomachSmall IntestineLarge Intestine (also known as the colon)RectumAnusIn addition to these organs directly involved in the passage of food, there are accessory organs such as the salivary glands, pancreas, liver, and gallbladder that play crucial roles in digestion. These accessory organs assist in breaking down food through the secretion of enzymes and other digestive juices, but do not come into direct contact with the food within the GI tract.
Please help!!!!!!!!!!!!!
Answer:the answer is d
Explanation:
A burner on a stove produces which type of energy
Answer:
Thermal energy
Explanation:
A burner on a stove produces thermal energy
Answer:
Thermal energy
Explanation:
A burner on a stove produces thermal energy.
Hope this helps!
Feel free to ask if you have anymore questions!
if 10 calories of energy are added to 2 grams of ice at -30°C, calculate the final temperature of the ice.
Answer:
= -20°C
Explanation:
The specific heat capacity of ice using the cgs system is 0.5cal/g°C
The enthalpy change is calculated as follows
ΔH=MC∅ where M represents mass C represents specific heat and ∅ represents the temperature change.
10cal = 2g×0.5cal/g°C×∅
∅=10cal/(2g×0.5cal/g°C)
∅=10°C
Final temperature= -30°C+ 10°C= -20°C
Answer:
-20 C
Explanation:
The chart shows data for four different moving objects.
Which shows the order of the objects' kinetic energies, from
least to greatest?
Object
Velocity (m/s)
w
Mass (kg)
10
18
14
30
W, Y, X, Z
Z, X, Y, W
W, Y, Z, X
X. Z. Y. W
30
Answer:
Explanation:
The formula for KE is KE = 1/2 m v^2
If they are all traveling at the same v (m/s) then the order of KE will be dependent on their masses.
10 < 14 < 18 < 30
30 has the most KE (see the formula) and 10 has the least KE
I've given you the answer. You will have to sort out WXYZ
Karen is running forward at a speed of 9 m/s. She tosses her sweaty headband backward at a speed of 20 m/s.
The speed of the headband, to the nearest whole number relative to a stationary observer watching Karen
Answer:
The speed of the headband, to the nearest whole number relative to a stationary observer watching Karen, is 11m/s
Explanation:
The velocity of the headband relative to the stationary observer is equal to the velocity of Karen relative to the stationary observer plus the velocity of the headband relative to Karen. Mathematically:
[tex]V_{H} =V_{K}+V_{H/K}[/tex]
Where:
[tex]V_{K}=9m/s [/tex]
[tex]V_{HK}=-20m/s [/tex] (it's negative because it mover backward)
[tex]V_{H} [/tex]: velocity of the headband relative to the stationary observer
Plugging these values
[tex]V_{H} =9m/s-20m/s=-11m/s[/tex]
Speed is simply the magnitude of velocity or its absolute value, that is to say, 11m/s (positive)
A theory is a ___.
A. Proposed explanation for an observation
B. Well-rested explanation for a broad set of observations.
C. Summary of the results of many observations.
D. Procedure used to test a proposed explanation.
A theory, in scientific terms, is a well-tested explanation for a broad set of observations. It is supported by a significant amount of evidence from various observations and experiments, and stands up to intense testing and scrutiny.
Explanation:A theory in the context of biology or other scientific fields is most accurately described as a well-tested explanation for a broad set of observations (Option B). It is not merely a proposed explanation for an observation (Option A), a summary of the results of many observations (Option C), or a procedure used to test a proposed explanation (Option D).
A theory is based on a substantial body of evidence gathered from many separate observations and experiments, and it holds up against rigorous testing and scrutiny. For instance, the theory of evolution explains a broad set of observations about the diversity and relatedness of life on Earth.
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A theory is a well-reasoned explanation for a broad set of observations that have been repeatedly tested and confirmed through rigorous scientific processes.
Explanation:A theory in scientific parlance can be best defined as a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation. To clarify, option B. 'Well-reasoned explanation for a broad set of observations.' is the most accurate definition of a theory. Theories are built not only upon isolated observations but moreover robust evidence. They form the backbone of scientific understanding and are not to be confused with a hypothesis which is indeed a proposed explanation and yet to be rigorously tested. While theories may offer a procedure for prediction or explanation, they themselves are not a procedure.
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Which statement best describes what energy transfer diagrams show?
Energy can change form, but the total amount of energy stays the same.
Every energy transformation results in a reduction of energy
Energy transformations result in fewer types of energy
Each type of energy can change into one other type of energy
Answer:
Energy can change form, but the total amount of energy stays the same.
Explanation:
Energy transformation diagrams shows the different forms of energy which are converted into different forms.
As we know by an example of potential energy to kinetic energy conservation when a block is compressed against the spring then initially total energy is in the form of elastic potential energy of the spring.
When block is released then total potential energy of the block is converted into the kinetic energy of the block.
So here we know that in energy transfer diagram shows the transformation of energy while total energy will always remains conserved.
so here correct answer would be
Energy can change form, but the total amount of energy stays the same.
Answer:
a
Explanation:
Energy can change form, but the total amount of energy stays the same.