Answer:
The (latent) heat of vaporization (∆Hvap) also known as the enthalpy of vaporization or evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance, to transform a given quantity of the substance into a gas.
The enthalpy of vaporization is a function of the pressure at which that transformation takes place. The heat of vaporization diminishes with increasing temperature and it vanishes completely at a certain point called the critical temperature (Critical temperature for water: 373.946 °C or 705.103 °F, Critical pressure: 220.6 bar = 22.06 MPa = 3200 psi ).
URGENT!!! sorry this is my first time using brainly! but here is my question: Two ropes are attached to a wagon, one horizontal to the west with a tension force of 30 N, and the other east and at an angle of 30° northward and a tension force of 40 N. Find the components of the net force on the cart. Show all your work. Thank you in advance!
The components of the net force on the cart is determined as 67.66 N.
Component of net force on the cart
The component of net force on the cart is determined by resolving the forces into x and y -components.
T1 = 30 N
T2 = 40 N
T1x = -30cos(0) = 30 N
T1y = 30sin(0) = 0
T2x = 40 x cos(30) = 34.64 N
T2y = 40 x sin(3) = 20 N
∑X = 30 N + 34.64 N = 64.64 N
∑Y = 0 + 20 N = 20 N
Resultant forceR = √(64.64² + 20²)
R = 67.66 N
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Einstein published three major scientific papers. One of these put forward a new way of calculating the size of molecules. Another explained Brownian motion — the random dance performed by specks of dust trapped in a fluid. Einstein suggested that the tiny particles making up the fluid — its atoms or molecules — were bouncing against the specks of dust and causing the motion. These papers helped to establish the reality of atoms and molecules. Another of Einstein’s 1905 papers explained the photoelectric effect — the way that metals could emit electrons (tiny charged particles) from their surface when light was shone on them. Most scientists believed that light travelled in waves — like sound or water waves. But Einstein suggested that the photoelectric effect could be explained if light could also behave as a stream of tiny packets of energy.
(2) Einstein’s paper on the photoelectric effect helped give birth to quantum theory, and it was for this paper that Einstein received the Nobel Prize in 1922. Quantum theory led, in the 1920s and 1930s, to another revolution in physics. Physicists showed that, as well as light waves behaving like particles, particles could sometimes act as waves. This theory established “objective probability” in physics. This was the idea that completely unpredictable chance events can take place at the subatomic level. Einstein never fully accepted the prevalent interpretation of quantum theory. But, while many of these interpretations involve wild metaphysical flights of fancy, the physical results are, like those of relativity, very well established.
(3) Marrying together the two pillars of 20th century physics — relativity and quantum theory — is a central problem for physics even today. Successfully doing this may require a revolution in science similar to those begun by Newton and Einstein. There are three main interconnected driving forces for such changes in science. The first is the development of technology. Changes in technology can make new experiments possible and they also influence the problems that scientists develop an interest in. Newton was fascinated by the new machines of the 17th century. Similarly, Einstein was fascinated by electricity and magnetism. This influence also works in a negative way. The governments and multinationals that control technology are often able to dictate what is researched.
(4) The second factor driving scientific progress is the way that the dominant ideas in society change. Ideas from the broader culture can impinge upon science. Newton’s ideas were part of a revolutionary new attempt at a rational explanation of both nature and society. On the other hand, the dominant ideas in society can also limit the development of science. This is most obvious in the social sciences, where delving too deeply into how society is organized might raise difficult questions for our rulers. Less is at stake in the natural sciences. Indeed, improvements in natural sciences are vital to our rulers if they want to compete effectively with each other. But the distorted worldview of capitalism still impacts on science. Extremely narrow and specialized bodies of knowledge develop—creating problems for scientists trying to bring about the kind of sweeping revolution heralded by Einstein.
(5) Finally, science moves forward because scientists seek to develop logically consistent theories. This can push them beyond the dominant or common sense ideas of their time. Einstein’s breakthrough cannot be reduced simply to changes in technology or wider cultural and ideological shifts. Science is not simply the gathering and ordering of data about the outside world. It also requires abstraction—developing theories about the underlying laws of nature that are usually not immediately apparent. This crucial role of theory is not just a feature of the natural sciences.
(6) Einstein argued that “common sense is the prejudices acquired by age 18”. Marxist theory, which is a social science topic, challenges “common sense” political ideas. If we, according to this theory, want to change the world, we need to combine our actions with theory that digs below the surface appearance of society to understand how the system works.
What is the main issue being discussed?
The main issue that is being discussed in the manuscript is the development of science.
What factors affect development of science?Capitalism impacts on science because extremely narrow and specialized bodies of knowledge creating problems for scientists to bring revolution. The dominant ideas in the society can also limit the development of science.
So we can conclude that the main issue that is being discussed in the manuscript is the development of science.
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Uranium-235 Fission
Given: energy released = about 200 MeV per individual reaction (mass = 235 amu)
Part A
Find the balanced nuclear reaction.
In the balanced nuclear reaction of uranium 235, we have thorium 231, helium atom and energy released at the right of the equation
Balanced nuclear reaction of UraniumThe balanced nuclear reaction of uranium is determined as follows;
[tex]^{235}_{92}U\ --- > \ ^4_2He\ + \ ^{231}_{90}Th\ + \ energy[/tex]
Thus, in the balanced nuclear reaction of uranium 235, we have thorium 231, helium atom and energy released at the right of the equation while uranium 235 is on the left hand side of the nuclear reaction equation.
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You decide to test both appraoches. First, you attach a parachute to a
0.07 kg egg and toss if from a window 30 m above the ground. The egg
reaches and maintains a falling speed of 0.5 m/sec. Upon reaching the
ground, the egg rapidly decelerates to 0 m/sec over the course of only
0.01 seconds. What force (expressed in N) did the egg experience upon
hitting the ground?
The force (expressed in N), the egg experience upon hitting the ground is 3.5N.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
Given is an 0.07 kg egg and toss if from a window 30 m above the ground. The egg reaches and maintains a falling speed of 0.5 m/sec. Upon reaching the ground, the egg rapidly decelerates to 0 m/sec over the course of only 0.01 seconds.
Average force = Mass x accelerationF = m x (Vf -Vi)/t
F = 0.07 x (0 - 0.5)/0.01
F = -3.5N
Thus, the magnitude of force on egg upon hitting the ground is 3.5N.
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an inclined plane has a velocity ratio of 2 and efficiency of 95%. it is used to raise a load of 400newtons. determine mechanical advantage? effort required?
Answer:
1.9
Explanation:
Efficiency=mechanical advantage/velocity ratio×100
95=M.A/2×100
95=50M.A
M.A=95/50=1.9
The mechanical advantage of the inclined plane is approximately 2.1053, and the effort required to raise the load of 400 newtons is approximately 189.78 newtons.
To determine the mechanical advantage and effort required for the inclined plane, we can use the formula:
Mechanical Advantage (MA) = Velocity Ratio (VR) / Efficiency
Effort Required = Load / Mechanical Advantage
Given:
Velocity Ratio (VR) = 2
Efficiency = 95% = 0.95
Load = 400 newtons
Calculate the Mechanical Advantage (MA):
MA = VR / Efficiency
MA = 2 / 0.95
MA ≈ 2.1053
Calculate the Effort Required:
Effort Required = Load / MA
Effort Required = 400 / 2.1053
Effort Required ≈ 189.78 newtons
So, the mechanical advantage of the inclined plane is approximately 2.1053, and the effort required to raise the load of 400 newtons is approximately 189.78 newtons.
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A bike with tires of radius 0.330 m speeds up from rest to 5.33 m/s in 6.27 s. What is the angular acceleration of the tires?
The angular acceleration of a bike with tires of radius 0.330 m speeds up from rest to 5.33 m/s in 6.27 s will be 2. 57 rad/s²
What is angular acceleration?
Angular acceleration can be defined as the time it takes for a change in angular velocity. It is denoted as 'α' with a unit of rads/s²
It is expressed thus;
α= Δω ÷ Δt
Where α = angular acceleration
Δw = change in angular velocity = velocity ÷ radius
Δ t = change in time
How to calculate the angular accelerationUsing the formula:
α= Δω ÷ Δt
v = 5. 33m/s, r = 0. 33m and t = 6.27s
Substitute the values to get the angular velocity
Δw = v÷ r = 5. 33 ÷ 0.330 = 16. 15 m/s
Substitute the value of Δw into the equation
α= Δω ÷ Δt = 16. 15 ÷ 6. 27 = 2. 57 rad/s²
Therefore, the angular acceleration of a bike with tires radius of 0. 330m, speed of 5. 33mls in 6. 27s is 2. 57 rad/s²
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Four identical point charges (+4.0 µC) are placed at the corners of a square which has 20- cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?
The work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.
Work doneThe work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is calculated as follows;
W = qV
where;
V is the potential energyq is the charge[tex]W = q (\frac{kq}{r} )[/tex]
where;
r is the distance of separation of the chargesDistance between two diagonal of a square = r√2[tex]W = q (\frac{kq}{r} + \frac{kq}{r\sqrt{2} } + \frac{kq}{r} )\\\\W = \frac{kq^2}{r} ( 2 + \frac{1}{\sqrt{2} } )\\\\W = \frac{(9\times 10^9 \times (4\times 10^{-6})^2}{0.2} ( 2.707)\\\\W = 1.9 \ J[/tex]
Thus, the work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.
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The object was thrown vertically upwards at a speed of 30 m / s. How high does the body go?
and how long does it take to get back to the point of shooting?
Answer:
4.9
Explanation:
Velocity half second before maximum height = Velocity half second after maximum height (Return journey)
For downward journey :
Initial velocity u=0 m/s
We have g=9.8 m/s
Time t= ½s
s
Thus velocity after half second v=u+gt
v=0+9.8× ½ =4.9m/s
1. Identify Give three examples of kinetic energy and three examples of potential energy .
Answer:
Examples of Gravitational Potential Energy
A raised weight.
Water that is behind a dam.
A car that is parked at the top of a hill.
A yoyo before it is released.
River water at the top of a waterfall.
A book on a table before it falls.
A child at the top of a slide.
Ripe fruit before it falls.
Explanation:
Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.
What is measurement???
knahi pani nepali ca jasto chaxenw
Explanation:
The comparison of an unknown physical quantity with the known standard quantity is called measurement....
Here are some tho.....
A person is hauling their taco stand and it takes 3,500 Joules of work to stop the taco stand. What force was exerted on the taco stand if it took 1.5 meters to stop the motion?
Given the work done, the force exerted on the taco stand through the given distance is 2.3 × 10³ Newtons.
What is Work done?Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;
W = f × d
Where f is force applied and d is distance travelled.
Given that;
Work done W = 3500J = 3500kgm²/s²Distance covered d = 1.5mForce applied F = ?W = f × d
3500kgm²/s² = f × 1.5m
f = 3500kgm²/s² ÷ 1.5m
f = 2.3 × 10³ kgm/s²
f = 2.3 × 10³ N
Given the work done, the force exerted on the taco stand through the given distance is 2.3 × 10³ Newtons.
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Which point shows the prevailing westerlies?
1
2
3
4
Answer:
2
Explanation:edu
Assume that the thickness of the tissue between the interior and the exterior of the body is =3 cm and that the average area through which conduction can occur is =1.5 m2 . Find heat transferred by conduction per hour if temperature difference between the inner body and the skin is ∆ = 2 0C. Coefficient of thermal for tissue without blood is = 18 × 10−2 Cal /m-hr- 0C.
The heat transferred by conduction per hour if temperature difference between the inner body and the skin is ∆ = 2°C is 18 Joule/ hr.
What is heat conduction?Heat conduction is the method of transfer of heat by the direct contact of the two or more solid bodies.
Given is the thickness of tissue x = 3cm =-0.03m, Area of conduction A = 1.5 m², Change in temperature of skin ΔT =2°C, and coefficient of thermal for tissue without blood is k = 18 × 10⁻² Cal /m-hr- °C
The conduction heat rate in hr is
Q =kAΔT /x
Q =18 × 10⁻² x 1.5 x 2 /0.03
Q =18 Joule / hr
Thus, the heat transferred by conduction per hour, if temperature difference between the inner body and the skin is ∆ = 2°C is 18 Joule/ hr.
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What happens to an object that is moving at 10 m/s if only balanced forces act on it?
Heelp me! and please explain...
If only balanced forces act on an object it will keep moving in the same speed and direction.
What is Vector?
This is defined as the type of quantity which has both magnitude and direction.
\Having balanced forces will bring about equilibrium which is why the obect will move in the same speed and direction.
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Two identical masses are attached to frictionless pulleys by very light strings wrapped around the rim of the pulley and are released from rest. Both pulleys have the same mass and same diameter, but one is solid and the other is a hoop As the masses fall in which case is the tension in the string greateror is it the same in both cases? Justify your answer
The tension in the string is same in both cases because of the similar mass or weight of the bodies.
Is tension be the same in both cases?Both pulleys have the same mass and same diameter, but one is solid and the other is a hoop, then there is same tension occurs in both cases because tension depends on mass which is similar on both side. We know that tension is the opposite force of the weight.
So we can conclude that the tension in the string is same in both cases because of the similar mass or weight of the bodies.
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while standing at the edge of a cliff 45m high, you drop a ball. When the ball has fallen 5m, you throw a second ball straight down. What initial speed must you give the second ball if they are both to reach the ground at the same time?
The initial speed of the second ball if they are both reach the ground at the same time is 19.8 m/s.
Speed of the balls
The initial speed of the second ball is calculated as follows;
v = √2gh
v = √(2 x 9.8 x 45)
v = 29.7 m/s
Time for the ball to travel 5 meterst = √(2h/g)
t = √(2 x 5/9.8)
t = 1.01 s
Initial speed of the first ballvf = vi + gt
29.7 = vi + 9.8(1.01)
29.7 = vi + 9.9
vi = 19.8 m/s
Thus, the initial speed of the second ball if they are both reach the ground at the same time is 19.8 m/s.
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A laser source is replaced by a laser of the same color that is more powerful. How does the light of the second laser compare with the original laser?
The light of the second laser compare with the original laser in the following way: the light in the second laser absorbs more optical radiation.
What is a laser?A laser is device that produces a monochromatic, coherent beam of light.
A laser is created when electrons in the atoms in optical materials like glass, crystal, or gas absorb the energy from an electrical current or a light.
Therefore, it can be said that light of the second laser compare with the original laser in the following way: the light in the second laser absorbs more optical radiation.
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Why do some people still believe that Earth is flat if it's disproven?
Answer:
some people failed to realize that the earth is round ligit
Explanation: they failed to do that because of how our eyes see the earth so they was like okay it is flat caused the never saw a person that showed it on the internet
X-ray production occurs in which process?
Answer:
Explanation:
X-rays are produced due to sudden deceleration of fast-moving electrons when they collide and interact with the target anode. In this process of deceleration, more than 99% of the electron energy is converted into heat and less than 1% of energy is converted into x-rays
A car moving south speeds up from 10m/s to 40m/s in 15 seconds what is the cars acceleration
• 2m/s
• 15m/s
• 30m/s
• 50m/s
The acceleration of the car will be 2m/s².Option A is correct. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration.
Given data;
Initial velocity,u=10m/s
Final velocity,v=40m/s
Time elapsed,t=15 seconds
To find ;
Acceleration, a
The acceleration when the change in the velocity is observed by the formula as:
[tex]\rm a= \frac{v-u}{t}[/tex]
Substitute the given values:
[tex]\rm a= \frac{40-10}{15} \\\\ a=\frac{30}{15} \\\\ a=2 \ m/s^2[/tex]
The car's acceleration will be 2 m/s².
Hence, option A is correct.
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Which process produce x-ray?
Answer:
X-rays are commonly produced in X-ray tubes by accelerating electrons through a potential difference (a voltage drop) and directing them onto a target material
An experiment was carried out by a student to determine the strength of an electric field. He observed the interactions between two oppositely charged objects and recorded his findings as follows: I. As the distance between charged objects increases, the electric force between them decreases. II. As the amount of charge on either object increases, the electric force between them increases. III. Oppositely charged objects will attract each other. Which of the above statements about the forces between charged objects is/are true?
All the statements are correct for the strength of electric field.
What factor affect the Electric Field ?The amount of charge on the source and the distances from the source charge both affect how strong the electric field is.
All the statements are true as
The electric force varies directly with charge therefore , statement 2 is correct
The electric force varies indirectly with the distance between the electric field , Therefore statement 1 is correct.
It is known that Oppositely charged objects will attract each other , Statement 3 is correct.
Therefore all the statements are correct for the strength of electric field.
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Which trait would most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats?
What will most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats is curiosity.
What is curiosity?Curiosity is defined as an inquisitive trait which is one of the qualities of a good scientist which drives them to discover more in their field.
For a scientist to investigate a blood-thinning agent in the saliva of vampire bats would have been driven by curiosity to do so.
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list five advantage of mecury over alcohol as a thermoelectric liquid
Explanation:
Advantages
It is a good conductor of heat and hence, can measure even high temperatures.
It gives results quickly – has a fast response time.
It expands linearly and less than alcohol and any other liquid.
It is more durable than alcohol thermometer because mercury does not evaporate easily.
consider the three vectors, A=3i+4j, B=2i-2j+4k, and C=-i+5j-3k. Show that the sum of the three vectors can alternatively be computed by first summing A and B and then summing the resultant with C or by first summing B and C and then summing the resultant with A.
Answer:
A+B+C=7j+k
Explanation:
A=3i+4j
B=2i-2j+4k
C=i+5j-3k
A=3i+4j
+
B=2i-2j+4k
i+2j+4k
A+B=i+2j+4k
+
C=-i+5j-3k
7j+k
A+B+C=7j+k
I need help with this question (open-ended question) 50 points (NO BOTS!!!)
Choose TWO locations below (A, B, C) and provide a two-sentence weather forecast for that location. Your forecast must include Wind direction, general wind speed (high, moderate, low) general temperatures (cold, cool, mild, warm, hot), and sky conditions(precipitation/stormy, sunny cloudy).
The weather forecast for the locations includes:
London - 21°C°, Precipitation: 60%, Humidity: 79%, Wind: 11 km/h.
New York - 26°C°, Precipitation: 50%, Humidity: 76%, Wind: 19 km/h.
What is weather?It should be noted that weather is the state of the atmosphere with respect to heat or cold, calm or storm, clearness or cloudiness.
Weather forecast is an analysis of the state of the weather in an area with an assessment of the likely developments.
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A projectile is launched with an initial speed of 60.0 m / s at an angle of 30.0 ° Problem 17 / Pg 76 above the horizontal . The projectile lands on a hillside 4.00 s later . Neglect air friction . ( a ) What is the projectile's velocity at the highest point of its trajectory ? ( b ) What is the straight - line distance from where the projectile was launched to where it hits its target ?
(a) The projectile's velocity at the highest point of its trajectory is 51.96 m/s.
(b) The maximum height reached by the projectile is 45.92 m.
Projectile velocity at the highest point of trajectory
At the highest point of trajectory the vertical component of the velocity will be zero will the horizontal component will remain constant.
Vxi = Vxf = Vcosθ = 60 x cos30 = 51.96 m/s
Maximum height of the projectileThe maximum height reached by the projectile is calculated as follows;
H = u²sin²θ/2g
H = (60² x (sin30)²)/(2 x 9.8)
H = 45.92 m
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Which is NOT a negative consequence of clearing land during deforestation? PLEASE
many answers to this question so chose whatever you link:
- urbanisation -> more people, humanity keeps on living, more job opportunities etc
- source of income for farmers
- source for food (farming)
- source for trees (eg, to create wood (houses), or to use logs for fire)
Look at this picture of people standing in a line. What could they do to create a model of a longitudinal wave?
edward travels 150 kilometers due west and then 200 kilometers in a direction 60 degrees north of west.what is his displacement in the westerly direction?
The displacement of Edward in the westerly direction is determined as 338.32 km.
What is displacement of Edward?The displacement of Edward can be determined from different methods of vector addition. The method applied here is triangular method.
The angle between the 200 km north west and 150 km west = 60 + 90 = 150⁰
The displacement is the side of the triangle facing 150⁰ = R
R² = a² + b² - 2abcosR
R² = 150² + 200² - (2x 150 x 200)xcos(150)
R² = 62,500 - (-51,961.52)
R² = 114,461.52
R = 338.32 km
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