When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol. The vaporization is the opposite process of condensation.
hope this helped <3
A box moves 5\,\text m5m5, start text, m, end text horizontally when force F=20\,\text NF=20NF, equals, 20, start text, N, end text is applied at angle \theta=45\degreeθ=45°theta, equals, 45, degree. What is the work done on the box by FFF during the displacement?
Answer:
70.71
Explanation:
Given that :
Force (F) = 20N
Distance moved (d) = 5 m
θ = 45°
Workdone on the box :
Workdone (W) = Fdcosθ ; where ;
F = Force, d = Displacement, θ = angle
W = 20 * 5 * cos45°
W = 100 * 0.7071067
W = 70.71 Nm
A ______________ is a continuous flow of water in a single direction. *
Answer:
Current
Explanation:
I think srry if im wrong
Answer: A River system
Explanation: A ___________ is a network of streams that drain an area of land and contains all of the land drained by a river including the main river and all its smaller streams or rivers that flow into larger ones, or tributaries (Source Quizlet)
EXPLAIN how a thermostat uses electric energy, mechanical energy , and thermal energy
true or false, the older rocks tend to be closer to the tear in the ocean floor
Answer:
false!!
your welcome!!!!
What is the mass of a cow moving at a velocity of 0.5 m/s with 25J of kinetic energy? Show work
Answer:
200 kg
Explanation:
Answer:
m= 50
Explanation:
m=f/a this is the formula for mass
m= 25/0.5 you substitute the numbers with their variables they you divide them to get the mass
m= 50
To cut down on injuries, a highway guardrail is designed to be moved a maximum of 0.05 meters when struck by a car. What is the value of the force constant of the material in the guardrail if it is to withstand the impact of a 1250-kg car traveling at 4.16 m/s ?
Answer:
216.32kN
Explanation:
Force can be expressed according to the formula;
Force = mass ×acceleration
Given
Mass = 1250kg
Velocity = 4.16m/s
Distance = 0.05m
We can get the acceleration first using the equation of motion
v² = u²+2as
4.16² = 0²+2a(0.05)
17.3056 = 0.1a
a = 17.3056/0.1
a = 173.056m/s²
Get the force required
Force = 1250×173.056
Force = 216,320N
Force = 216.32kN
Hence the force constant of the material is 216.32kN
What is the total force of an object which has a mass of 150kg and is accelerating at 2m/s/s?
Answer:
[tex]\boxed {\boxed {\sf 300 \ Newtons }}[/tex]
Explanation:
Force can be found by multiplying the mass by the acceleration.
[tex]F=ma[/tex]
The mass is 150 kilograms and the acceleration is 2 meters per second per second, or 2 meters per square second.
[tex]m= 150 \ kg \\a= 2 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]F= 150 \ kg * 2 \ m/s^2[/tex]
Multiply.
[tex]F= 300 \ kg*m/s^2[/tex]
We know that 1 kilogram meter per square second is equal to 1 Newton. Therefore our answer of 300 kg*m/s² is equal to 300 N[tex]F= 300 \ N[/tex]
The force of the object is 300 Newtons.
If you place two magnetic trains very close to eachother on a track will they atracct?
Answer:Most likely yes, sorry if wrong!!
Explanation:
A ball is thrown upward at 4 meters per second starting from ground level. How long does it take for the ball to return to the ground?
Answer:
it takes 2 min to return
Explanation:
The force of the added water produces a torque on the dam. In a simple model, if the torque due to the water were enough to cause the dam to break free from its foundation, the dam would pivot about its base (point P). What is the magnitude τ of the torque about the point P due to the water in the reservoir?
Answer:
The appropriate response is "[tex]\tau=\frac{1}{6} PgLh^3[/tex]". A further explanation is described below.
Explanation:
The torque ([tex]\tau[/tex]) produced by the force on the dam will be:
⇒ [tex]d \tau=XdF[/tex]
On applying integration both sides, we get
⇒ [tex]\tau = \int_{0}^{a}x pgL(h-x)dx[/tex]
⇒ [tex]= pgL\int_{0}^{h}(h-x)dx[/tex]
⇒ [tex]=pgL[\frac{h^3}{2} -\frac{h^3}{3} ][/tex]
⇒ [tex]=\frac{1}{6} PgLh^3[/tex]
The torque acting on the dam wall is due to the force of water pressure
which depends on the density and depth of the water and on gravity.
[tex]\displaystyle The \ \mathbf{torque} \ at \mathbf{ \ point \ P}\ due \ to \ the \ reservoir \ water \ is, \, \underline{\tau = \frac{1}{6} \cdot \rho \cdot g \cdot w \cdot h^3 \right)}[/tex]Reasons:
The question parameters are;
Width of the dam = w
Height of the dam = h
Required:
The torque due to the water about point P at the base of the dam
Solution:
The pressure of the water vary with depth
Force, F = Pressure, P × Area, A
Therefore, for an infinitesimal area, dA, where the pressure can be taken as constant, we have;
dF = P × dA
dA = w × dy
P = ρ·g·y
∴ dF = ρ·g·y·w·dy
Torque, τ = Force, F × Distance, d
The distance of an infinitesimal point below the surface of the water in the dam = h - y
Where;
h = The height of the water in the dam
The infinitesimal torque at an infinitesimal point where the pressure is constant is therefore;
dτ = dF × (h - y)
Which gives;
dτ = (h - y)·ρ·g·y·w·dy = ρ·g·w·(h·y - y²)·y
The torque is therefore;
[tex]\displaystyle \int\limits d\tau = \mathbf{ \int\limits^h_0 {\rho \cdot g \cdot w \cdot (h \cdot y - y^2)} \, dy}[/tex]
Which gives;
[tex]\displaystyle \tau = \int\limits^h_0 {\rho \cdot g \cdot w \cdot (h \cdot y - y^2)} \, dy = \mathbf{\rho \cdot g \cdot w \cdot \left[\frac{h \cdot y^2}{2} - \frac{y^3}{3}\right]^h_0} = \rho \cdot g \cdot w \cdot \left(\frac{h ^3}{2} - \frac{h^3}{3}\right)[/tex]
[tex]\displaystyle \tau = \rho \cdot g \cdot w \cdot \left(\frac{h ^3}{2} - \frac{h^3}{3}\right) = \rho \cdot g \cdot w \cdot \left(\frac{3 \cdot h ^3 - 2\cdot h^3}{6} \right) = \mathbf{ \rho \cdot g \cdot w \cdot \left(\frac{h ^3 }{6} \right)}[/tex]
[tex]\displaystyle The \ torque \ at \ the \ base \ of \ dam \ is, \, \tau = \frac{1}{6} \cdot \rho \cdot g \cdot w \cdot h^3 \right)[/tex]
The force of the torque at the base of the dam is on the same line of action as the point P, therefore, the torque at the base is equal to the torque at point P, which gives;
[tex]\displaystyle The \ torque \ at \ the \ base \ of \ dam \ is, \, \tau = \mathbf{\frac{1}{6} \cdot \rho \cdot g \cdot w \cdot h^3 \right)} = Torque \ at \ point \ P[/tex]
[tex]\displaystyle The \ torque \ at \ point \ P\ due \ to \ the \ reservoir \ water \ is, \, \underline{\tau = \frac{1}{6} \cdot \rho \cdot g \cdot w \cdot h^3 \right)}[/tex]
The parameters used are based on a similar question obtained online.
Learn more about the application of integration here:
https://brainly.com/question/19578741
https://brainly.com/question/18568839
Pleaaseeee hellppp !!!
Answer + Explanation:
The answer is B, because once you get to the top, your potential energy (no movement) will pause at the top, and right when you drop, it'll convert to kinetic energy.
i'm very sorry if i gave you the incorrect answer, but if it's not B then it's either A or C-...
Why is the heliocentric model not correct
Answer:
Um, wrong.
Explanation:
The Helioentric model is correct. We orbit the sun. The GEOcentric model is incorrect. The Universe does not orbit the Earth. What are you learning?
Question 19 D
An electron is accelerated in an electric field through a potential difference of +2400 V. Which of the following justifies why the change in kinetic energy can be calculated using AU = QAV?
А
The electric field exerts a force on the electron that is proportional to the electron's charge
B
The change in potential energy of the field electron system is equal to the change in kinetic energy of the particle
с
The work done on the particle by the field is equal to the electric force times the distance the electron moves.
D
Changes in potential and kinetic energies are always equal.
Option B is the correct option.
The change in kinetic energy can be calculated using ΔU = QΔV because the change in potential energy of the field electron system is equal to the change in kinetic energy of the particle.
What is the law of conservation of energy?
The law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.
According to this law of conservation energy, the potential energy of a substance can be converted into kinetic energy of the substance.
Mathematically, the relation between change in kinetic energy and change in potential energy is given as;
ΔU = ΔK.E
where;
ΔU is change in potential energyΔK.E is change in kinetic energyFor an electron accelerated in an electric field through a potential difference of +2400 V, the change in potential energy is given as;
ΔU = QΔV
where;
ΔU is change in potential energyQ is the charge of the electronV is the potential differenceThus, the change in kinetic energy of the electron can be calculated due to law of conservation of energy.
Learn more about law of conservation of energy here: https://brainly.com/question/166559
#SPJ1
Increasing your workload a little bit is called?
A progression
B regularity
C overload
D specificity
Answer: A
Explanation:
Please answer the circled questions, I will give you brainliest
Answer:
yo so if nobody helps ill gladly take the brainliest
Explanation:
r o b l o x is down today
NEED HELP NOW I WILL BRAINLIEST
Answer:
C. 16 grams
Explanation:
0 0=2.7x0 256=256÷1
1 2.7=2.7x1 128=256÷2
2 5.4=2.7x2 64=128÷2
3 8.1=2.7x3 32=64÷2
4 10.8=2.7x4 ???=32÷2
3) Choose the best answer.
The
which caused the card to move was snapping the ruler.
O resistance
O sound
force
speed
4) Select 3 that apply.
Answer:
what?
Explanation:
write it correctly I don't understand the question
How does the force work
Answer:
A force is a push or a pull.
Explanation:
Example: A boy is pushing a box. He has to push the box to go forward or pull it to go backwards.
Hope this helped
What is the frequency of a mechanical wave that has a
velocity of 1.70 m/s and a wavelength æf 12.05 m?
Explanation:
v= (f) x ( lambda)
1.7 ms^-1/12.05 m = f =o.14 hz
Mass and weight are the same in
meaning and unit.
true or false
Answer:
False.
Explanation:
Mass is how much space an object takes up, while weight is how light or heavy an object is.
Please help me wright a essay on Newtons law lab!!!!!
What is your hypothesis (or hypotheses) for this experiment?
What methods are you using to test this (or each) hypothesis?
Section II: Data and Observations
Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?
Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?
NEWTONS LAWS is the topic i really need help on writing the essay!!!!!
Newton’s law of motion can be divided by three types that is 1st law, 2nd law and 3rd law and it is law of gravity. The three laws are simple and sensible.
The first law states that a force must be applied to an object in order to change its velocity. When the object’s velocity is changing that mean it is accelerating, which implies a relationship between force and acceleration.
The second law, the acceration of an object is directly proportional to the net force acting on it and is inversely proportional to its mass. The direction of the acceleration is in the direction of the acceleration is in the direction of the net force acting on the object.
Finally, the third law, whenever we push on something, it pushes back with equal force in the opposite direction.
find the temperature when the fahrenheit scale reading is exactly equal to the celsius scale .
Answer:
The temperature is -40 degrees, this means that:
-40°C = -40°F
Explanation:
If we have a temperature T in the Celcius scale, the equation to transform it into the Fahrenheit scale is:
(T*9/5) + 32
Now we want to have the same reading in Celcius than in Fahrenheit, then we must have:
(T*9/5) + 32 = T
We need to solve this for T.
T*(9/5) - T = -32
T*(9/5 - 5/5) = -32
T*(4/5) = -32
T = -32*(5/4) = -40
This means that -40°C = -40°F
A rock thrown to the right with an initial horizontal velocity of 4 m/s lands after 5
seconds. What horizontal distance has the rock traveled?
Answer:
20m
Explanation:
Using the equation s=d/t and re arranging it to solve for distance, d=St, where d=distance, s=speed, ant t=time, we can plug in known variables.
d=4*5
d=20m
there is a distance of 20m traveled
The horizontal distance traveled by the rock is 20 m
For horizontal motion, we use the formula below
⇒ Formula
s = vt.................... equation 1
⇒ Where
S = horizontal distance traveled by the rockv = velocity of the rockt = timeFrom the question,
⇒ Given:
v = 4 m/st = 5 seconds⇒ Substitute these values into equation 1
s = 4×5s = 20 mHence, The horizontal distance traveled by the rock is 20 m
Learn more about horizontal motion here:
the slope of a position-timw graph can be used to find the moving objects.....?
Answer:
Velocity
Explanation:
The slope of a position-time graph gives velocity of a moving object.
Which equation is used to
calculate the atomic mass of an
atom?
Answer:
For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.
15 pointsss please help meeeeeeeeeee
The velocity of an object can be calculated as:
starting velocity + (_____________________ * delta-t)(2.5 Points)
(one option)
A. acceleration
B. displacement
C. instantaneous velocity
D. average velocity
Answer:
the answer is A. acceleration mom
Explanation:
:)
what is the acceleration if a 5 kg cart is pushed with 30 N of force?
Answer:
6 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{30}{5} \\ [/tex]
We have the final answer as
6 m/s²Hope this helps you
Help ASAP please I can’t figure it out and it’s making me stressed
Explanation:
may I ask what it is on because I might be able to help out
The particles of a substance in which state of matter have the least energy?
A. Liquid
B. Solid
C. Gas
D. Vapor
Answer:
B. Solid
Explanation:
Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed. There are spaces between particles of matter.
hope i helped have a great day
Answer:
B. Soild
Explanation:
I dont feel like explaning (:
