The wagon and the child inside it make up the system of interest, acceleration equals 0.13 m/s² in the direction of child 1 and Zero acceleration if friction is 15.0 N.
When two things are moved against one another, instant friction results. The motion will be opposed by the friction, who will also be working against it. When an item is in motion and its velocity changes, the concept of acceleration takes place. Friction, which opposes motion, always lowers acceleration. An object and a surface come into contact and cause friction. The features of the surface and the item, as well as whether or not the object is moving, determine its magnitude. Always, friction works in the opposite direction of motion. As a result, friction cancels out some of the force driving motion when it is there. Therefore, there will be less acceleration and net force.
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2. Matt always brings sugar cubes with him when he visits his horse Trinity. Matt noticed that Trinity would become excited after eating the sugar cubes. However, now Trinity seems to get excited as soon as she sees Matt.
NS:
UCS:
UCR:
CS:
CR:
Answer:
i don't know what?
Explanation:
i said what?
Which are assumptions of the kinetic theory?
The assumptions of the kinetic theory is given below.
A gas of a pure material is made up of identical molecules.The molecules are always in a constant random motion. We can ignore the intermolecular forces.The ratio of space-volume to molecules is negligible.Total momentum and kinetic energy are conservedA gas molecule always travels in a straight line with the constant speed between two successive collisions.We can assume that a gas molecule is an ideal particle.The kinetic theory postulates that liquid molecules constantly move, expressing their thermal energy. These molecules frequently clash with one another, and occasionally one or another surface collision gains enough momentum to propel it out of the liquid and into the sky.
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as additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected? as additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected? the effect on the power supplied by the source cannot be determined without knowing the voltage of the source. the power supplied by the source increases. the power supplied by the source decreases. the power supplied by the sources remains constant.
The equivalent resistance of a circuit reduces as more parallel resistors are added, but the circuit's overall current increases. Additional branches via which charge can flow are comparable to more resistors being added in parallel.
A circuit can have parallel or series connections connecting two or more electrical components. The circuit is referred to as a parallel circuit when all of the devices are linked utilizing parallel connections. Each device is located in a distinct branch of a parallel circuit. Branch lines indicate that there are numerous paths for charge to move via the external circuit.
A single resistor located in a single branch will be contacted by each charge moving through the external circuit's loop. A charge choose which branch it will take on its way back to the low potential terminal when it reaches the branching site or node.
It was made clear that increasing the number of resistors in a parallel circuit has the very surprising effect of reducing the total resistance. The addition of a second resistor in a different branch creates a second avenue for charge to travel through the circuit's primary area of resistance because there are numerous ways for it to do so.
By increasing the number of branches, the resistance will reduce, which will increase the pace at which charge flows (also known as the current).
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constant pressure cooling of steam. steam at 200°c and 10 bar is cooled under constant pressure until it becomes a saturated liquid. a. what is the final temperature? b. how much heat is removed from the steam? c. calculate the work involved in this process, if any.
From steam table,
(a).
The final temperature is 180°C.
At 10 bar, saturated liquid,
Temperature = 180°C
(b).
Heat removed from the steam is 2065.6 kJ/kg.
At 10 bar - 200°C, h1 = 2828.27 kJ/kg
At 10 bar, saturated liquid, h2 = 762.68 kJ/kg
Heat removed = h1 - h2 = 2065.6 kJ/kg
(c).
Work done is 204.9 kJ/kg.
Work done = heat removed - change in internal energy = 2065.6 - (2622.26 - 761.55) = 204.9 kJ/kg
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a proton with a speed of 3 x 105 m/s falls through a potential difference v and thereby increases its speed to 5 x 105 m/s. through what potential difference did the proton fall?
8.33 x 10²v .
The potential difference at which proton fall is : = 8.33 x 10²v .
What is potential difference?The work done in moving a unit of positive electric charge from one point to another is defined as potential difference.Electric potential is the work done per unit charge to bring a charge from infinity to a point in an electric field, whereas electric potential difference is the potential developed while moving a charge from one point in the field to another.Here,
The potential difference is as follows:
Energy change, [tex]e^{v}[/tex] = 1/2 m(v2² - v1²)
By substituting,
1 . 602 x 10 ⁻¹⁹ = 1/2 x 1.67 x 10 ⁻²⁷( 5² - 3²) x 10 ¹⁰
v x 1.602 x 10⁻¹⁹ = 0.835 x 10⁻¹⁷ x 16
v = ( 0.835 x 10⁻¹⁷ x 16 ) / 1.602 x 10⁻¹⁹
= 0.835 x 10²x16 / 1.602
= 13.36 x 10² / 1.602
= 8.33 x 10²v
So the potential difference is : 8.33 x 10²v .
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A baseball is thrown at a speed of Vo at an angle of elevation θ. Determine its range (R) in terms of Vo and θ.
The range of baseball thrown at a speed of Vo at an angle of elevation theta is Vo^2sin2theta/g.
What is range and how it comes out to be so ?See we have already studied about projectile in so many instances and in our earlier classes also.Projectile is simply a thing or an object thrown at a speed by the means of external force under the influence of gravity.Range is the maximum height that can be attained by the projectile , that is thrown up.We can also sometimes depict it as the horizontal displacement of the projectile.Whenever we throw a baseball up at sky , there is a launch point , the distance between the launch point and the end point is range.To know more about range visit:
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rocket a passes earth at a speed of 0.70 c. at the same time, rocket b passes earth moving 0.86 c relative to earth in the same direction. how fast is b moving relative to a when it passes a?
Rocket B's speed in relation to rocket A is 0.4c
If the two frames of reference's directions are at odds with one another, the two frames of reference would see the relative speed as the total of their individual speeds. Furthermore, if the motion of the two frames is parallel, relative speed would be seen as the difference between the individual speeds.
The Earth's frame of reference is at rest, but the two rockets passing by are traveling relativistically with respect to Earth.
Since both rockets are moving in the same general direction, rocket B's relative speed to rocket A is equal to the difference between the two rockets' individual speeds.
Speed of rocket A is v = 0.70c
speed of the rocket B is u =0.86c
let,
speed of the rocket B with respect to rocket A is u₁
Now,
u₁ = (u - v) / [(1 - u) * (v / c²)]
u₁ = (0.86 - 0.70) / (1 - 0.86 * 0.70 / c²)
u₁ = 0.16 / (1 - 0.6) = 0.16 / 0.4
∴ u₁ = 0.4c
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your friends have heard that you took an astronomy class and they need your advice. they plan to get married at sunset, and they want the moon to be high in the sky. what phase should the moon be?
In astronomy class friends plan to get married at sunset, and they want the moon to be high in the sky. The moon should be First Quarter phase.
The study of the cosmos and everything in it that is not within the atmosphere of Earth is referred to as astronomy. Astronomers investigate the locations, movements, and characteristics of celestial objects. Astrology tries to understand how those placements, motions, and qualities impact people and events on Earth. The main distinction between astrology and astronomy is what determines the outcome. The Sun and Moon's effects during a particular zodiac sign are interpreted by the ancient tradition of astrology. 12 divisions of the sky, each measuring precisely 30 degrees, are said to exist in astrology. The scientific community has rejected astrology because it lacks the ability to explain how the cosmos works. The premises and claimed effects described in astrological traditions have not been proven by scientific research to be true.
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your car has been making an odd noise consistently for about a week. one day while driving, the sound suddenly changes and becomes louder than it was before. the fact that you notice the change indicates that the volume of the sound has crossed your
Option c is the right solution. This shows that it has gone beyond the threshold when the difference is immediately noticeable.
The lowest kinetic energy that two moving particles must have when they collide is known as the threshold energy in particle physics. Always larger than or equal to the desired particle's rest energy is the threshold energy. As a result, this is changed to: f = W/h, where h is the Planck constant. So, we can calculate the threshold frequency if we know the work function. Photoelectric effect in radioactivity. The frequency at which the effect is only feasible is known as the photoelectric threshold frequency, denoted by the Greek letter nu with the subscript zero, v0. The threshold energy is the lowest energy that each colliding molecule must have in order for the collisions to be successful.
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What do you guys think is the singularity?
A singularity is a point where some property is infinite.
What is meant by singularity?In technology, singularity describes a hypothetical future where technology growth is out of control and irreversible. Most especially, the singularity would require computer programs to become so advanced that artificial intelligence transcends human intelligence, potentially rubbing out the boundary between humanity and computers. Nanotechnology is recognized as one of the key technologies that will make singularity a truth. The technological singularity or simply the singularity is a hypothetical future point in time at which technological growth becomes uncontrollable and irreversible, resulting in unforeseeable changes to human civilization.
So we can conclude that a point where something is infinite is known as a singularity.
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a 44kg box is sitting on a flat surface. the box is being pulled along at constant velocity. if the coefficient of static friction is 0.44 and the coefficient of kinetic friction is 0.27, what is the force of friction on the block?
Force of friction if the coefficient of static friction is 0.44 is 189.728N. The force of friction if the coefficient of kinetic friction is 0.27 is 116.424N.
Force of friction:
The force that resists the sliding or rolling of one solid object over another is called the force of friction.
The formula for the force of friction is:
F =μN
F = force of friction
μ= coefficient of friction
N = normal force
We have to find the force of friction when the coefficient of static friction is 0.44.
[tex]F_{s}[/tex] = μ N
= μmg
= 0.44× 44×9.8
= 189.728N
Now we have to find the force of friction when the coefficient of kinetic friction is 0.27
[tex]F_{k}[/tex] = μN
= μmg
= 0.27 × 44 × 9.8
= 116.424N
Therefore the force of friction [tex]F_{s}[/tex] is 189.728N and [tex]F_{k}[/tex] is 116.424N
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blue - lead car
black- following car
If the lead car breaks before the other car, will it crash?
Explain the features of the graph.
How we read the two colors
What the areas tell us
What the slopes tell us
How the graph is answering that question.
COLOR BY NUMBER
NET FORCE
Date:
Per:
ī
Directions: Answer each question by circling the correct choice. After you have completed all of the
questions, color the picture using the assigned colors.
Question
Choice A
1. The sum of all forces acting on an
object is known as...
2. Which of the following is a
characteristic of a balanced force?
3. Which of the following is a
characteristic of an unbalanced force?
4. Which of the following represents
balanced forces?
5. Which of the following represents
unbalanced forces?
6.
7.
8.
9.
10.
10N
14
7N
7N
[orange]
Directions: Calculate the net force in the questions below.
120N
16N
3N 7
4N
4N
5N
14N
5N
50N
7N
applied force
[purple]
equal in size,
opposite in direction
[red]
equal in size,
opposite in direction
[sky blue]
7N
7N
12N to the left
[orange]
A) ON [red]
B) 7N, right
[purple]
7N
125N to the right
[green]
C) 28N, right
[green]
C) 2N, left
[blue]
[purple]
A) 2N, right
[red]
3N₁
7N to the left
[red-orange]
B) 12N, right
[purple]
Name:
Choice B
net force
[black]
causes a change
in the direction
of an object
[sky blue]
does not cause a
change in the motion
of an object
[green]
11N
[sky blue]
5N
[purple]
11N
SN
11N to the left
[yellow]
125N to the left
[sky blue]
21N to the right
[orange]
A) 45N, right [brown]
B) 35N, right [orange]
C) 40N, right [yellow]
B) Dog B [yellow]
C) Dog C[green]
Choice C
normal force
[green]
causes a change
in the motion of
an object
[orangel
causes a change
in the motion of
an object
[purple]
8N
4N
[orange]
2N 2N
[yellow]
21N to the left
[blue]
170N to the right
[pink]
11. Two students kick a soccer ball at the same time.
Student A kicks the ball with a force of 80N to the
right. Student B kicks the ball with a force of 45N to
the left. Calculate the net force.
1N to the left
[yellow-green
12. Three dogs are pulling on a stuffed animal. Dog
A pulls with a force of 150N to the north. Dog B pulls
with a force of 150N to the south. Dog C (a much
smaller dog) is pulling to the east with a force of
40N. Which dog will win the toy?
A) Dog A [red-orange]
Morpho Science
The net force exists 0 when the forces are in equilibrium. They have the same impact as if there were no forces at all.
What is meant by Net Force?Net Force, which is essentially the total of all the forces operating on an item, is the combination or consequence of those forces.
The total of all forces exerted on an object is known as the net force. A mass can accelerate due to net force. A body is subject to another force whether it is at rest or in motion. When there exists a lot of forces acting on a system, the term "net force" exists employed.
Equal in size and directed in the opposite direction, balanced forces are. When forces are evenly distributed, motion remains unchanged. One of your scenarios from the previous section involved pushing or pulling an object with the equal amount of force in opposite directions.
The complete question is:
Directions: Answer each question by circling the correct choice. After you have completed all of the questions, color the picture using the assigned colors.
Question
Choice A
1. The sum of all forces acting on an object is known as...
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Classify each model A-D as either an element, a compound, or a mixture. Explain your reasoning for each answer
Answer:
a
Explanation:
A sample starts with 1.0x10^16 nuclei of 3,1^H which has a half life of 12 years. Whats the half life after 12 years?
Answer:
See below
Explanation:
The half life is 12 year, so after 12 years HALF Of the sample will be gone and half will be left
1/2 * 1 x 10^16 = .5 x 10^16 = 5 x 10^15 nuclei
the idling engines of a landing turbojet produce forward thrust when operating in a normal manner, but they can produce reverse thrust if the jet is properly deflected. suppose that while the aircraft rolls down the runway at 150 km/h the idling engine consumes air at 50 kg/s and produces an exhaust velocity of 150 m/s.
Forward thrust has positive values and reverse thrust has negative values.
Thrust is a sudden push or pull in a certain direction.
a)
Flight speed u = 150 km/h
1 km/h = [tex]\frac{1}{3.6}[/tex] km/s
therefore, 150 km/h = 41.67 km / s
The thrust force represents the horizontal or x-component of momentum equation:
[tex]T = m_{exhaust} * U_{exhaust} - U_{flight}[/tex]
T = 50 * (150 - 41.67)
T = 5416.67 N
Therefore, the value of forward thrust is 5416.67 N.
b)
Now the exhaust velocity is now vertical due to reverse thrust application, then it has a zero horizontal component,
thus thrust equation is:
[tex]T = m_{exhaust} * U_{exhaust} - U_{flight}[/tex]
T = 50 * (0 - 41.67)
T = -2083.5 N
Therefore, the thrust force T is -2083.5 N in the reverse direction.
c)
Now the exhaust velocity and flight velocity is zero, then it has a zero horizontal component, thus thrust is also zero because[tex]U_{exhaust} = U_{flight} = 0\\[/tex]
T = 0
Therefore, there is no difference in two velocities in x direction.
The given question is incomplete, the complete question is,
"The idling engines of a landing turbojet produce forward thrust when operating in a normal manner, but they can produce reverse thrust if the jet is properly deflected. Suppose that while the aircraft rolls down the runway at 150 km/h the idling engine consumes air at 50 kg/s and produces an exhaust velocity of 150 m/s.
a. What is the forward thrust of this engine?
b. What are the magnitude and direction (i.e., forward or reverse) if the exhaust is deflected 90 degree without affecting the mass flow?
c. What are the magnitude and direction of the thrust (forward or reverse) after the plane has come to a stop, with 90 degree exhaust deflection and an airflow of 40 kg/s?"
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4. given long wire connecting c and d c d 220 v where the motor is drawing 8 amps and the lamp 2 amps, find a. the voltage drop across the wire - modeled by the 2 ohm resistor. b. the voltage across the motor and lamp
What is the kinetic energy and the potential energy in joules of an 8500 kg airplane is flying at 220 km/h?
Answer:
Kinetic Energy is 1.59x10^7 Newtons
Potential Energy cannot be determined since no height is given. An example calculation is provided that assumes 3000 meters.
Explanation:
Kinetic energy is directly proportional to the mass of the object and to the square of its velocity:
K.E. = 1/2 m v2.
If the mass is in kilograms and the velocity in meters per second, the kinetic energy has units of kilograms-meters per second squared, which is 1 Newton. (A newton is defined as 1 kg⋅m/s2. 1 Joule is defined as 1 N*m, or 1 kg⋅m2/s2
Data: 8500 kg airplane
220 km/h flight speed
We'll convert the speed from km/h to m/sec.
(220 km/h)*(1 h/3600 sec)*(1000m/1km) = 61.1 m/s
Kinetic Energy:
K.E. = 1/2 m v2
K.E. = 1/2 (8500 kg)*(61.1 m/s)^2
K.E. = 1/2 (8500 kg)*(3733 m^2/s^2)
K.E. = 1.59x10^7 kg*m^2/s^2
K.E. = 1.59x10^7 Newtons
Potential Energy
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
P.E. = mgh
P.E. = (8500kg)*(9.8 m/s^2)*(h)
I don't see a height given for the plane, so we can't calculate a potential energy. If it were at 3000 meters (1.86 miles), the calculation would be:
P.E. = (8500kg)*(9.8 m/s^2)*(3000 m)
P.E. = (2.5x10^8 kg*m/s^2) or 2.5x10^8 Newtons
you have a motor with a shaft diameter of 25 mm from which you have hung a weight of 1.1 kg on a thin wire. (assume that the mass of the wire mass is very small compared to that of the weight.) what is the torque on the motor’s shaft?
The torque on the motor's shaft is 1.375 Nm.
We need to know about torque to solve this problem. Torque is the rotational equivalent of linear force. It can be determined as
τ = F x r
where τ is torque, F is perpendicular force and r is radius.
From the question above, the parameter given are
m = 1.1 kg
d = 25 cm
r = 12.5 cm
Convert radius to meter
r = 12.5 cm
r = 12.5 x 10¯² m = 0.125 m
Find the weight
W = m . g
W = 1.1 . 10
W = 11 N
By substituting the parameters, we get
τ = F x r
τ = 11 x 0.125
τ = 1.375 Nm
Hence, the moment applied is 1.375 Nm
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what is WO2 name in chemical compounds
Answer:
Tungsten oxide...
hop e it helps
Consider the 636 N weight held by two cables shown below. The left-hand cable had tension T and makes an angle of θ with the wall. The right-hand cable had tension 890 N and makes an angle of 26◦ with the ceiling.
What is the angle θ which the left-hand cable makes with respect to the wall?
The angle θ which the left-hand cable makes with respect to the wall is 17⁰.
What is resultant force on the cables?The resultant force on the cables is determined by resolving the forces into x and y components as shown below.
y-component of the weight;
Wy = -636 N
y-component of the tension in the right cable;
Ty = 890 x sin(26)
Ty = 390.15 N
x-component of the tension in the right cable;
Tx = 890 x cos(26)
Tx = 799.93 N
y-component of the tension in the left cable;
Ty = T sinθ
x-component of the tension in the left cable;
Tx = -T cosθ
Sum of the forces in y-direction;
∑F_y = 0
T sinθ - 636 + 390.15 = 0
T sinθ - 245.85 = 0
T sinθ = 245.85 -------- (1)
Sum of the forces in x-direction;
∑Fx = 0
-T cosθ + 799.93 = 0
T cosθ = 799.93 -------- (2)
Divide equation (1) by (2)
T sinθ / T cosθ = 245.85/799.93
tanθ = 0.307
θ = arc tan(0.307)
θ = 17.1⁰ ≈ 17⁰
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A block rests on top of a
table. Consider only the
forces acting upon the
block.
Gravity: P or A?
Spring: P or A?
Tension: P or A?
Friction: P or A?
Air Res: P or A?
Normal: P or A?
In case of a block resting on the top of a table and we are considering only the forces acting upon the block.
(block)
_______[[[[[[[[[]]]]]]]]]]_______ ( table)
/ \
/ \
/ \
figure represents block resting on a table,
Gravity P
Spring: A
Tension A
Normal: P
Friction A
Air Res.: A
All objects are affected by gravity, which is an attraction between the Earth and the object.There is no spring force since no springs are in contact with the item.There are no tight-knotted strings (or ropes, or...) attached to the thing so no tension.A solid surface is immediately supporting the block (the table).There is no friction since the object is not moving or attempting to move over a surface.There is no air if an object is not moving in relation to the air around it.To learn more about forces on a block at rest , visit
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how high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 24.4 m/s? m (b) if, in actuality, a 750 kg car with the same initial speed is observed to coast up a hill to a height 14.3 m above its starting point, how much thermal energy was generated by friction?
The car can coast up to the height of 30.34m and (b) the thermal energy generated by friction is 118047.75J.
What is Kinetic energy?The energy in which an object that has as a result of motion is called as kinetic energy. A force is applied to an object in instruct to accelerate it. We have to put the effort in order to apply the force. After the completion of the work the energy is removed from the item and then it moves at a new, constant speed.
What is Potential energy?Potential energy is defined as the form of stored energy which is dependent on the ordering of system components.
(a) given; [tex]v=24.4m/s^{2}[/tex], [tex]g=9.81m/s^{2}[/tex]
KE(initial)= PE(final)
[tex]\frac{1}{2} mv^{2}[/tex]=[tex]mgh[/tex]
[tex]h=\frac{v^{2} }{2g}[/tex]
[tex]h=\frac{24.4^{2} }{2*9.81}[/tex]
h=30.34m
(b) If, in actuality, a 750 kg car with the same initial speed is observed to coast up a hill to a height 14.3 m above its starting point
E(friction)=KE(initial)-PE(final)
E(friction)=[tex]\frac{1}{2} mv^{2}-mgH[/tex]
E(friction) =[tex]\frac{1}{2}(750)24.4^{2} - (750)(9.81)(14.3)\\[/tex]
E(friction)=118047.75J
What is friction?A friction is defined as the force which prevents two objects from moving against each other.
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1. A chickadee flies 30 m to the West for 6 seconds and then 40 m to the North for 14 seconds. What is the average velocity of the chickadee’s flight?
The magnitude of the average velocity of chickadee flight is 2.5 m/s
What is average velocity?
Average velocity is defined as the rate of change of displacement with respect to time. Mathematically, we can write -
v = Δx/Δt
Given is a chickadee who flies 30 m to the West for 6 seconds and then 40 m to the North for 14 seconds.
Now, the displeacement of the chickadee, can be calculated as follows -
|Δx|² = (30)² + (40)²
|Δx|² = 900 + 1600
|Δx|² = 2500
|Δx| = [tex]\sqrt{2500}[/tex]
|Δx| = 50
Now, the average velocity of the chickadee will be -
v = |Δx|/Δt
v = 50/(6 + 14)
v = 50/20
v = 2.5 m/s
Therefore, the magnitude of the average velocity of chickadee flight is 2.5 m/s
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What is the right option for this question?
(Question is attached below)
the magnetic portion of a standard circuit breaker? select one: a. provides an instantaneous trip for high levels of current b. protects the circuit from heat damage generated by lower level currents c. prevents the device from tripping due to a short circuit d. provides a trip delay for high levels of current
Fuse, breakers, and other overcurrent protection devices set an appropriate current limit and sever short circuits.
The size of the overcurrent protection system depends on the overcurrent protection system type and the maximum current that can travel through the circuit components. National codes specify the size and design of the overcurrent protection system. The size of the overcurrent protection devices is typically determined by the array's short-circuit current.
The PV is a limited current source, meaning that the short-circuit current is the highest current produced by this source, which is the major justification for choosing the array's short-circuit current.
The distribution lines of electric grids integrated with DER are safeguarded by an overcurrent protection system. The phase overcurrent protection and the ground overcurrent protection are two further classifications for this protection strategy. Depending on the distribution method, the relays employed in such schemes could be either directional (functioning for in-front events) or nondirectional (working for all). Radial distribution systems are where nondirectional relays are most frequently employed.
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problem 4: a disk of mass m and radius r, a hoop of mass 2m and radius r, and a ball of mass m and radius 2r are rolling without slipping. the hoop can be treated as a thin ring and the ball should be modeled as a hollow sphere.
a. Angular speed, w = v/r where v is the linear speed, r is the radius
b. v = w*r
c. I(disk)=1/2mr^2,I(hoop)=mr^2, I(Ball)=8/3mr^2 disk is the smallest moment of inertia.
A body has an attribute called inertia that makes it resist attempts to move it or, if it is already moving, to alter the speed or direction of its motion. A body's inertia is a passive characteristic that prevents it from doing anything other than opposing active agents like forces and torques. A moving body continues to move not because of its inertia but rather because no force exists to stop it, alter its direction, or accelerate it.
A body's moment of inertia, which quantifies its resistance to the action of a force, and its mass, which determines how resistant it is to the action of a force, are two numerical measures of inertia.
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6. Substances soluble in water possess which molecular characteristic that substances insoluble in water lack?
Substances that are soluble in water are polar substances which is a molecular characteristics that is not possessed by insoluble substances.
What is molecular characteristics?The molecular characteristics of a substance is the features that are exhibited by the ions and molecules of that substance that makes it unique from others.
Soluble substances are those substances that are able to dissolve in water while insoluble substances are those substances that are not able to form solution with water.
Example of soluble substances are salt and sugar while examples of insoluble substances are metals and fat.
The soluble substances are polar substances are they possess a negative and a positive pole in their molecules that allows for dissolution in water.
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what is the average speed of a car that moves 450 m in 25 s
Answer:
18m/s
Explanation:
Divide 450 into 25 to know how many m per second and it gives 18m per second
A student designed an experiment to test the hypothesis that even very cold objects like ice contain heat . The student obtained liquid air , at a temperature of 200 , stored in a thermally insulated Under the supervision of the teacher , the student immersed a block of ice at a temperature of 12 C in the liquid air The temperature of the ice was measured over time What is the expected result of the experiment and why ? A The ice will become colder because the extreme difference in temperature will cause the particles of ice to slow down and increase in temperature B The liquid air will boil because the extreme difference in temperature will cause heat to be transferred from the ice to the liquid air and the molecules of the liquid air will begin to leave the liquid The ice will become warmer because the extreme difference in temperature will cause the particles of ice to gain kinetic energy , speed up and increase in temperature D The liquid air will freeze because the extreme difference in temperature will cause heat to be transferred to the ice and the molecules of the liquid air will move
The expected result of the experiment is that the liquid air will boil because the extreme difference in temperature will cause heat to be transferred from the ice to the liquid air ( B ).
The temperature of the liquid air = - 200 °C
The temperature of the block of ice = - 12 °C
Since they are in a thermally insulated flask, the heat will be transferred until both the objects' temperature becomes equal. So the temperature of liquid air rises and the temperature of ice decreases. The boiling point of liquid air is - 194.35 °C. So the liquid air boils.
Option A would have been correct if the final statement was decrease in temperature and not increase in temperature. Option C is incorrect because the ice becomes colder. Option D is incorrect because liquid air will boil.
Therefore, the expected result of the experiment is that the liquid air will boil because the extreme difference in temperature will cause heat to be transferred from the ice to the liquid air and the molecules of the liquid air will begin to leave the liquid ( B ).
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