Latent heat is the heat required to change the phase. When the temperature remains constant during melting or boiling the added energy is employed in the phase change process.
What is average kinetic energy?The average kinetic energy (KE) is defined as the one-half of the mass of each gas molecule times multiplied by the square of RMS velocity.
[tex]KE = \frac{1}{2}m (V_{rms})^{2}[/tex]
where,
KE is the kinetic energy
m is the mass of each molecule
(V)rms is the RMS velocity
As we know since the temperature is increasing the average kinetic energy of the particle increases. So the added energy is utilized in the sensible heat due to which the temperature of the body increases resulting in the increase in average kinetic energy
But when the temperature remains constant during melting or boiling the added energy is converted into latent heat energy utilized to convert the phase of a substance.
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Which evidence card could be eliminated because it did not isolate variables?
Evidence Card A: Magnetic pole arrangement
Evidence Card A: Magnetic pole arrangement
Evidence Card B: Number of wire coils
Evidence Card B: Number of wire coils
Evidence Card C: Rail material
Evidence Card C: Rail material
Evidence Card D: Distance between the car and launcher
Evidence Card D: Distance between the car and launcher
None should be eliminated.
None should be eliminated.
Based on the nature of variables, none of the evidence card should be eliminated because they all represent variables.
What are variables?Variables refers to any quantity that can have various values.
Variables include age, time , distance, height, speed, etc.
Variables can either be independent, dependent or constant.
Magnetic pole arrangent is a variable because it can take different values.Number of coils is a variable because it can take different values.Rail material is a variable because it can take different values.Distance between the car and launcher is a variable because it can take different values.There, none of the evidence card should be eliminated because they all represent variables.
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The r force is the overall force. If two forces are acting in the same direction, the resultant force is the s of all the forces.
please help me fill in the two blanks were r and s is
The resultant force is the overall force. If two forces are acting in the same direction, the resultant force is the sum of all the forces.
Happy to help!
The resultant force is the overall force. If two forces are acting in the same direction, the resultant force is the sum of all the forces. Hence the blanks where r and s are resultant force and sum respectively.
What is force?Force is an external factor, which aids a body to change from the state of motion or rest. There are different types of forces namely, magnetic force, gravitational force, nuclear force, frictional force etc.
The unit of force is newton. According to Newton's second law of motion, the force acting on a body is the product of its mass and acceleration. Thus we have the equation F = ma.
If a body experience's different forces or the same forces in different direction the net force in after all balancing is called the resultant force.
Now, if two forces are acting on the same direction, the resultant force will be the sum of these forces.
Therefore, the blanks in the place of r and s are resultant and sum respectively.
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Describe, step by step, how you would set up a simple investigation to show that: kinetic friction is less than static friction
Answer:
You can use a block and an inclined plane (just a tilted board)
Place the block on the plane and gradually increase the angle the plane makes with the horizontal.
Static friction will keep the block in place (no sliding) until the angle between the plane and the horizontal is large enough. The block will now slide but is still under the influence of kinetic friction. Thus static friction is greater than sliding friction.
How much force is needed to accelerate an object of mass 90 kg at a rate of 1. 2 m/s2?.
Answer:
108
Explanation:
because F=ma
which is 90 × 1.2
= 107N
Electric charge only
has an amount. That makes it a
Answer:
that makes it a scalar quantity
The electric charge only has an amount that makes it a scalar quantity.
What is scalar quantity?A scalar quantity is a type of quantity that can be described by magnitude only. Scalar quantity has no direction and can be represented by magnitude only.
Electric charge with only amount can be said to be a scalar quantity, because it can be completely described by its magnitude only.
Thus, the electric charge only has an amount that makes it a scalar quantity.
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Who was the english thinker who established the three laws of motion?.
Answer:
Isaac Newton
Explanation:
Because i learned this in school
If the frequency of a wave is 400hz and it’s wave length is2.5 what is the velocity ?
How will you show the presence of infrared rays in the electromagnetic spectrum?
Answer:
In the near infrared (NIR) and the short-wave infrared (SWIR) spectrums, we measure the reflectivity of objects. Thus, using a specific lighting working in an active infrared spectrum, we can capture the rays reflected by the object and produce its reflectrogram.
Explanation:
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[tex]kai6417[/tex]
Using two boxes, design two solar ovens. Before you build, describe your designs. Discuss elements such as materials, box shape, and color, and explain why you think the oven will work.
Answer:
Find two boxes just a bit smaller than the other. The long sides of the box should be less than twice as long as the short side of the boxes. The smaller box should fit inside the larger box with about 1 inch in each direction to spare. The boxes can be cut down so that they fit together properly. Leave the flaps on the boxes. Buy a small sheet of Plexiglas (tm) a little bit smaller than the width and length of the top of the box. You will also need four pieces of cardboard to use for reflectors.
Explanation:
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1.) Define force? Give an example.
2.) Define Newton's 1st Law? Give an example.
3.) Define Newton's 2nd Law? Give an example.
4.) Define Newton's 3rd Law? Give an example.
Answer:
1.) strength or energy to do an action or movement
2.)an object will jot change its motion unless acted on by an unbalanced force
a a Imagine a basketball bouncing. As it is moving up, does it have a positive or a negative acceleration? Why?
Answer:
moving up positive acceleration
Explanation:
when moving up as you bounce the ball
the speed changes gradually increasing so according to the equation
acceleration =[speed change ] ÷ period when speed change is positive acceleration is also positive , and an greater value
example speed changes 5m/s within 2 seconds throwing the ball upward
(these are assuming values to explain)
acceleration is 5/2 = + 2.5 m/s^2
so this is an positive acceleration
if negative we call deceleration
When a basketball is bouncing and moving up, it has a negative acceleration.
Acceleration is the rate of change of velocity with respect to time. If the velocity of the basketball is increasing in the upward direction as it bounces, the acceleration is directed downward (negative). This might seem counterintuitive at first, but it is essential to understand that acceleration is a vector quantity, which means it has both magnitude and direction.
When the basketball moves upward during its bounce, its velocity is slowing down due to the opposing force of gravity. As it moves against gravity, the magnitude of its velocity decreases until it reaches the highest point (apex) of its bounce, where its velocity momentarily becomes zero. At the apex, the basketball changes direction and starts moving downward, and its velocity increases in the downward direction.
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What is the liquid called that if heat is created it turns into
this?
Answer:
latent heat, also called the heat of vaporization
Random Question
A magician comes onto the stage he shows the judges he has a card he shows both sides while grinning, he grabs a pen and it goes right through! He takes it back out and the card has no rip or tear and it looks just the same! How did he do it?
Answer:
B
Explanation:
The Magician pulled a rabbit out of his hat
What is it called when you pull a line off your reel and cast it?
Carl hits a baseball with a force of 8 n. The next batter, stacy, hits it with 12 n of force. Which ball will accelerate faster?.
Answer:
The ball hit with 12N
Explanation:
Just took the quiz and got it right
A 500-ml sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains unchanged what is the new pressure?.
Answer
P V = C R T natural gas law
P1 V1 = C R T1
P2 / P1 = T2 / T1 = 4 other numbers remain constant and cancel
P2 = 4 P1
The new pressure is 4 times as great.
The new pressure is 4 times greater.
Argon:The chemical element argon has the atomic number 18 and the symbol Ar. It is a noble gas that belongs to group 18 of the periodic table.At 0.934 percent, argon is the third-most abundant gas in the Earth's atmosphere (9340 ppmv). It is 23 times as abundant as carbon dioxide (400 ppmv), more than 500 times as abundant as neon, and more than twice as abundant as water vapor, which averages around 4000 ppmv but varies substantially (18 ppmv). The most prevalent noble gas in the crust of the Earth, argon makes up 0.00015 percent of the crust.Torr:The torr is an absolute scale pressure measurement that is equal to precisely [tex]\frac{1}{760}[/tex] of a standard atmosphere. As a result, [tex]\frac{101325}{760}[/tex] pascals is exactly one torr. Although historically one torr was meant to be equivalent to one "millimeter of mercury," later redefinitions of the two units resulted in a minor difference.Solution -
[tex]PV=CRT[/tex] (Natural gas law)
[tex]P1V1=CRT1[/tex]
[tex]\frac{P2}{P1} =\frac{T2}{T1} =4[/tex] (Other members remain constant and cancel)
[tex]P2=4P1[/tex]
Therefore, the new pressure is 4 times greater.
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A cyclist is travelling at 4.0 m/s. She speeds up to 16 m/s in a time of 5.6 s. Calculate her acceleration.
Answer:
acceleration: 2.14 m/s²
Explanation:
acceleration = (final velocity - initial velocity ) ÷ time taken
Here the final velocity is 16 m/s, initial velocity is 4 m/s, time taken is 5.6 s
acceleration = ( 16 - 4 ) ÷ 5.6
→ 12 ÷ 5.6
→ [tex]\left[\begin{array}{ccc}\frac{15}{7}\end{array}\right][/tex] m/s² or 2.14 m/s²
A hunter aims directly at a target (on the same level) 73.0 m away. If the bullet leaves the gun at a speed of 190 m/s , by how much will it miss the target
We have that the miss distance is mathematically given as
h= 0.76 m
Distance of miss
Question Parameters:
Generally the equation for the Time is mathematically given as
t = d / v
Therefore
[tex]t = \frac{73.0 m}{ 185 m/s}[/tex]
t = 0.39s
Hence
x = 1/2 g t^2
x = 1/2 *9.8 * 0.39 s ^2
x= 0.76 m
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If you view an object with binoculars, and the image appears right side up and a dozen times larger, then what is the magnification of the binoculars?
12 x is the magnification power if we view an object with binoculars, and the image appears right side up and a dozen times larger.
What is magnification power?Magnification power refers to the larger image of a given lens can make of an object which is seen through the lens. If a microscope has magnification power up to 1000x, then this means that the image of the object is 1000 times larger than the original one so we can conclude that the magnification power of binocular is 12x.
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why is it that; the greater the area, the lesser the pressure applied?
Answer:easier for a sharp pin to penetrate a piece of cardboard than a blunt one
Explanation:when the same force is used. A solid resting on a horizontal surface exerts a normal contact force equals to its weight.
The __________ is located under the forebrain and midbrain. A. forebrain B. midbrain C. hindbrain D. brainstem
Answer is the hind brain
The brainstem is located under the forebrain and midbrain. Therefore option D is correct.
The brainstem is located under both the forebrain and midbrain. It is a vital component of the central nervous system that connects the brain to the spinal cord and controls many essential functions such as breathing, heart rate, and digestion.
It consists of three main regions: the medulla oblongata, pons, and midbrain. The forebrain, midbrain, and hindbrain together constitute the major divisions of the brain.
The hindbrain is positioned below the midbrain and includes structures like the cerebellum, pons, and medulla oblongata.
The brainstem, specifically its lower regions, is responsible for relaying information between the brain and the rest of the body while regulating critical bodily functions.
Therefore option D is correct.
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Compare the gravitational field and the electric field produced by a proton
O The electric field is stronger and is the opposite direction of the gravitational field
C The gravitational field is stronger and is in the same direction as the electric field
O The gravitational field is the same strength as the electric field
O The electric field is stronger and has the same direction as the gravitational field
By using what we know about microscopic interactions, we will see that the correct option is:
"The electric field is stronger and is the opposite direction of the gravitational field"
Comparing the gravitaitonal and electric fields.
The gravitational field depends on the mass of the proton, while the electric field depends on the charge of the proton. We know that gravity is negligible at such small scales, where the electric and nuclear interactions rule. So for such small particles, electric fields will always be stronger than gravitational fields.
Now, in which direction points each field?We know that the gravitational force is an attractive force, so the field will point inwards.
In the other hand, the electric force depends on the type of the charge. Two equal chares repel and two opposite charges attract.
In the case of the proton, we have a positive charge, so it will only atract negative charged particles. So the vectors of the field point outwards.
Then we can conclude that the field's directions are opposite.
Then the correct option is:
"The electric field is stronger and is the opposite direction of the gravitational field"
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give 3 examples that gives distance
Answer:
d(P1,P2) = (x2 x1)2 + (y2 y1)2 + (z2 z1)2. This can be proved by repeated application of the Pythagorean Theorem. Example The distance between P1 = (2,3,1) and P2 = (8,5,0) is d(P1,P2) = (8 2)2 + (5 3)2 + (0 1)2 = 36 + 64 + 1 = 101 10.05.
Explanation:
PLEASE HELP ME!!!!! You draw an arrow from left to right on a piece of paper and place the paper well behind a glass of water. You observe that the direction of the arrow appears reversed behind the water glass!
What conclusions can you draw from this experiment?
(1 point)
The arrow appears reversed because light is bent as it enters the water, and again as it exits. The two light paths cross, making the direction of the arrow appear crossed.
The arrow appears reversed because light is bent as it enters the water, and again as it exits. The two light paths cross, making the direction of the arrow appear crossed.
The arrow appears reversed because light is reflected by the glass of water. Light is reflected so much that the arrow appears to face the other direction.
The arrow appears reversed because light is reflected by the glass of water. Light is reflected so much that the arrow appears to face the other direction.
It is not possible for the arrow to appear reversed behind a glass of water. The most likely explanation is that a mistake was made during the experiment.
It is not possible for the arrow to appear reversed behind a glass of water. The most likely explanation is that a mistake was made during the experiment.
The arrow appears reversed because light is split as it enters the water, and combines again as it exits the water. When the light re-combines, the arrow appears to be flipped.
Answer:
I think it is the first one: The arrow appears reversed because light is bent as it enters the water, and again as it exits. The two light paths cross, making the direction of the arrow appear crossed.
Explanation:
What does it mean when it is said that
the action force and reaction force are
both "equal and opposite"?
A. The direction of force is opposite, but the magnitude of
force is equal.
B. The magnitude of force is opposite, but the magnitude of
force is equal
C. Both the direction of force and the magnitude of force
are equal.
D. Both the direction of force and the magnitude of force
are opposite
Answer: A
Explanation: The direction of force is opposite but the magnitude of force is equal.
A horse travels at 12 km/hour. How long will it take to travel 18km?
A student observes that the temperature of a container of water stops increasing right before it starts to boil and turn into gas. Which statement is correct about the thermal energy of the water? (1 point)
The kinetic energy of the water is still increasing even though the temperature is not increasing.
The thermal energy of the water remains constant as it transforms from liquid to gas.
The thermal energy of the water is still increasing even though the temperature is not increasing. The potential energy of the water remains constant as it transforms from liquid to gas.
During boiling, the temperature of a container of water remains constant because thermal energy of the water is constant during the transformation from liquid to gas.
What is kinetic energy?Kinetic energy is energy possessed by a particle by virtue of its motion. Molecules that compose matter are in constant random motion according to the kinetic theory of molecules.
The temperature of a container of water stops increasing right before it starts to boil and turn into gas because the thermal energy of the water remains constant as it transforms from liquid to gas. The heat that is required to turn the liquid into gas at the boiling point is called the latent heat.
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Which picture correctly shows the path of the reflected light ray?
Select one:
a. A
b. B
c. C
d. D
In my opinion it's picture D
What is the nature of material after elastic limit
Answer:
In stress strain curve of ductile materials, up to proportionality limit stress and strain are proportional to each other and also elastic in nature. After that proportionality disappears and only elasticity remains. That limit is called elastic limit.
Explanation:
How was Mendeleev first periodic table like the periodic table today
Answer:
He began organizing the known elements according to their atomic weights and chemical properties.
Explanation: