Answer: A
Explanation: Edg2020
Dibuja la gráfica de calentamiento de un kilogramo de plomo que se encuentra inicialmente a 70ºC y pasa a una temperatura final de 2000ºC, sabiendo que su temperatura de fusión es: 327.4ºC y la de ebullición es de 1725ºC
Answer:
Q= m [tex]c_e[/tex] ΔT and Q = m L
Explanation:
For this graph of temperature vs energy (heating) we must use two relations
* for when there is no change of state
Q= m [tex]c_e[/tex] ΔT
* for using there is change of state
Q = m L
the second expression is a consequence of the fact that all the energy supplied is used to change the state of the solid-liquid and liquid-gas system
the energy supplied is the sum of the energy in each interval
divide the system into intervals determined by the state change points
1) from T₀ = 70ºC to T_f = 327.4ºC, sample in solid-liquid state
c_e = 128 J / kg ºC
Q₁ = m c_e (T_f -To)
Q₁=1 128 (327.4 -70)
Q₁ = 3.29 10⁴ J
Q = Q₁ = 3.29 10⁴ J
2) when is it changing from solid to liquid
L = 2.45 10⁴ J / kg
Q2 = 1 2.45 10⁴
Q2 = 2.45 10⁴ J
Q = Q₁ + Q₂
Q = 5.74 10⁴ J
3) from to = 327.4ºC until T_f = 1725ºC, sample in liquid state
in the tables the specific heat of the solid and liquid state is the same
Q3 = m c_e (T_f -To)
Q3 = 1 128 (1725 -327.4)
Q3 = 1.79 10⁵ J
Q = Q₁ + Q₂ + Q₃
Q = (3.29 +2.45 + 17.9) 10⁴ J
Q = 23.64 10⁴ J
4) for when it is changing from the liquid state to the gaseous state
L_v = 8.70 10⁵ J / kg
Q₄ = m L_v
Q₄ = 1 8.70 10⁵
Q₄ = 8.70 10⁵ J
Q = Q₁ + Q₂ + Q₃ + Q₄
Q = (3.29 +5.74 + 17.9+ 87.0) 10⁴ J
Q = 110.64 10⁴ J
5) from To = 1725ºC to T_f = 2000ºC, sample in gaseous state
Q₅ = m c_e ΔT
Q₅ = 1 128 (2000 -1725)
Q₅ = 3.52 10⁴ J
Q = Q₁ + Q₂ + Q₃ + Q₄ + Q₅
Q = 114.16 104 J
the following table shows the points to be plotted
Energy (10⁴ J) Temperature (ºC)
0 70
3.29 327.4
5.74 327.4
23.64 1725
110.64 1725
114.16 2000
In the attachment we can see a graph of Temperature versus energy supplied
Un tanque de 50 litros tiene un gas a CNPT. ¿Cuánto valdrá la presión si la temperatura aumenta 40 °C, y el volumen permanece constante?
Answer:
La presion a 40 °C es 1.05 atm.
Explanation:
Usando la ecuación ideal de los gases.
[tex]PV=nRT[/tex]
Debemos recordar, que CNPT significa condiciones normales de presión y temperatura.
Para el primer estado tenemos:
[tex]P_{1}V_{1}=nRT_{1}[/tex]
Donde:
P(1) es la presion en el estado incial (1 atm)V(1) es el volumen incial (50 L)T(1) es la temperatura incial (25 °C = 298 K)Para el segundo estado:
[tex]P_{2}V_{2}=nRT_{2}[/tex]
Donde:
P(2) es la presion en el estado final ( x atm)V(2) es el volumen final (50 L)T(2) es la temperatura final (40 °C = 313 K)Como ambas ecuaciones tienen el mismo valor de volumen podemos igualarlas:
[tex]\frac{nRT_{1}}{P_{1}}=\frac{nRT_{2}}{P_{2}}[/tex]
n y R permanecen constantes, se puden cancelar.
[tex]\frac{T_{1}}{P_{1}}=\frac{T_{2}}{P_{2}}[/tex]
Despejamos P(2).
[tex]P_{2}=\frac{P_{1}T_{2}}{T_{1}}[/tex]
[tex]P_{2}=\frac{1*313}{298}[/tex]
[tex]P_{2}=1.05\: atm[/tex]
Espero te haya sido de ayuda!
A crane lifts a load of 15000N to a height 40m in 50 seconds. Calculate the power of the crane
Answer:
P = 12000 W
Explanation:
General data:
F = 15000 N d = 40 mt = 50 sP = ?Work is force times unit of distance. So in order to calculate the power we must first calculate the work.
Formula:
[tex]\boxed{\bold{W=\frac{F}{d}}}[/tex]Replace and solve
[tex]\boxed{\bold{W=\frac{15000\ N}{40\ m}}}[/tex][tex]\boxed{\bold{W=600000\ J}}[/tex]once the work is found, we proceed to find the power according to the formula:
[tex]\boxed{\bold{P=\frac{W}{t}}}[/tex][tex]\boxed{\bold{P=\frac{600000\ J}{50\ s}}}[/tex][tex]\boxed{\boxed{\bold{P=12000\ W}}}[/tex]The power of the crane is 12000 Watts.
Greetings.
An electric circuit consists of light bulb with resistance of 10.0 ohm is connected to a
voltage source. The source provides a current of 2.00 mA in the bulb. What is the power
of the light bulb?
Answer:
P=I²R
Explanation:
P=2*10^-3 square times 10
4 times ten raise to power minus 5
An electric pencil sharpener is powered by 6 volts. The current through the pencil sharpener is 0.5 amps. What's is the resistance?
Answer:
Resistance in pencil sharpener = 12 ohms
Explanation:
Given:
Voltage in pencil sharpener = 6 volts
Current in pencil sharpener = 0.5 amps
Find:
Resistance in pencil sharpener
Computation:
Resistance = Voltage / Current
Resistance in pencil sharpener = Voltage in pencil sharpener / Current in pencil sharpener
Resistance in pencil sharpener = 6 / 0.5
Resistance in pencil sharpener = 12 ohms
A person can lands safely on the surface of the earth but not moon. why?
Answer:
The gravitational force on the moon is less than on Earth, because the strength of gravity is determined by an objects' mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere
Explanation:
Why might astronauts choose to “lope” or hop rather than walking or running on the moon? Astronauts can “lope” in the moon's low gravity levels, even though this gait pattern is very difficult to use on Earth.
What is the function of Soda Line
You are designing a new piece of fishing equipment that will allow you to catch a fish from the surface. You know that water refracts light, but in order to properly program your device, you need to know by what angle water refracts light. Describe an experiment you would conduct to determine the angle at which water refracts light.
Please help! I’ll really appreciate it! :(
Answer:
Law of refraction
Explanation:
An experiment to analyze the refraction of light in water can easily be performed with a laser pointer and protractor.
We throw the fishing rod line into the water, place the protractor at the point where the line touches the water and use the direction of the line for the direction of the laser pointer (on), the laser is visible by the reflection on the particles in the air.
The vertical line is called Normal and all angles must be measured with respect to this reference in optics.
Having these angles and the refractive index of water we can use the law of refraction
n₁ sin θ₁ = n₂ sin θ₂
θ₂ = [tex]sin^{-1} ( \frac{n_1}{n_2} \ sin \ \theta_1 )[/tex]
we can repeat several times to analyze several different input points (different angles) and to decrease the errors in the measurements.
the refractive index of air is n1 = 1 and n2= 1.33 (water)
Below is a single of DNA, What is the complementary base pair for RNA?
AGC, CGT, ATA, GAT
The density of silver is 10.49 g/cm3. If a sample of pure silver has a volume of 12.993 cm3, what is the mass?
Explanation:
Density=mass/volume
mass=x
10.49=X/12.99
X=10.49 X12.99
X=136.29657
mass=136.3g/cm^3
I hope it helped.
Explain how the light behaves with light through a
plastic bulb
Answer:
It's red
Explanation:
Blue light has a shorter distance between wave crests than orange light. Red light has a longer distance between wave crests than blue light.
what is an echo?
give me an short answer
Answer:
Echo..... when the sound reflects back
According to the law of universal gravitation, any two objects are attracted to each other. The strength of the gravitational force depends on the masses of the objects and their distance from each other.
Many stars have planets around them. If there were no gravity attracting a planet to its star, the planet's motion would carry it away from the star. However, when this motion is balanced by the gravitational attraction to the star, the planet orbits the star.
Two solar systems each have a planet the same distance from the star. The planets have the same mass, but Planet A orbits a more massive star than Planet B.
Which of the following statements is true about the planets?
A.
Planet B will keep orbiting its star longer than Planet A.
B.
Planet B is more attracted to its star than Planet A.
C.
Planet A orbits its star faster than Planet B.
D.
Planet A has a longer year than Planet B.
C. Planet A orbits its star faster than Planet B.
Explanation:
since Planet A is closer to the star due to its gravitational force, it will orbit its star faster than planet B
hope this helps :)
a car has a mass of 200kg. It is on a hill 1000m high. How much gravitational potential energy does the car have?
Answer:
Explanation:
PE = m * g * h
m = 200 kg
h = 1000 m
g = 9.81
PE = 200 * 9.81 * 1000
PE = 1962000 Joules
25. Suppose there is no unbalanced force acting on a moving object. How will
the object's motion continue?
A. The speed of the object will decrease.
B. The speed of the object will increase.
C. The speed of the object will remain the same.
D. The direction of the object's velocity will change.
Answer:
C
Explanation:
Grammar is probably one of the most important components of the sciences besides math.
no unbalanced forces means that there is no force left over that cause an acceleration. All the forces are balanced.
So the Speed will not decrease. Not A.
The speed will not increase. Not B
The direction will not be affected. Not D
The answer is C
True or false: balanced forces are important for a hoverboard to float.
True
False
Answer:
True its got to be true
Explanation:
how else does a hoverboard float lol
Answer:
It's true
Explanation:
So true..
A ladybug crawls vertically on a leaf. Its motion is shown on the following graph of vertical position y vs. time t. What is the average speed of the ladybug between the times t=4s and t=7s?
0.67 m/s
0 m/s
-0.67 m/s
1.5 m/s
why are nuclear reactions used in nuclear power plants
Answer:
Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity.
Answer:
A nuclear power plant's heart is made up of nuclear reactors. They contain and regulate nuclear chain reactions, which produce heat via a physical process known as fission. This heat is converted to steam, which powers a turbine to generate energy.
9. What strategies can be used to ensure that the forests are a continued
source of resources? [5]
Help me pls I’m giving brainlest and 10 points plssss
Answer:
Strategies to ensure that - forests are continued source of resources.
Explanation:
Forests continued sustainable use, ie today's use without compromising with tomorrow's needs - can be done using following strategies
By protection against Environment Degradation phenomenas - Soil Erosion (Erosion of top most fertile layer of soil), Land Degradation (Land losing its essential valuable nutrients) By ensuring that rate of extraction of forest resources is less than their replenishment rate, & our waste generation into forests is less than their absorptive capacity.want brainlyist whats number am i thinking of from 1 to 100
Answer:
50 out of 100 (ik its right)
Answer:
57? 17? 7? 77? 37? 47? 87? 97? 27? 67?
Explanation:
id'k
What was the initial velocity of a rock throw upwards if the velocity after 8 s is 90m/s?
Answer:
Initial velocity of rock = 11.6 m/s
Explanation:
Given:
Final velocity of rock = 90 m/s
Time taken by rock = 8 seconds
Find:
Initial velocity of rock
Computation:
Using first equation of motion;
v = u + at
For rock
v = u + gt
Acceleration due to gravity = 9.8 m/s²
90 = u + (9.8)(8)
90 = u + 78.4
u = 90 - 78.4
u = 11.6
Initial velocity of rock = 11.6 m/s
The game of floor hockey is primarily a blank
and blank
game.
Answer:
Fast and Energetic
Explanation:
The game of floor hockey is primarily a Fast and Energetic game. The main objective of the game of field hockey is to score more goals than the opposing team by shooting the Hockey ball into the goal post of the opposing team, Field hockey is similar to Ice hockey but the major difference is that Filed hockey is played without skates
Water rockets are very different from fuel powered rockets for many reasons. Explain some of the differences between them and why rockets that are launched into space require more power and thrust that water rockets?
Answer:
How is a water rocket different than a compressed air rocket?
Usually the rocket is made from a 2-liter soda pop bottle. Before launch, the bottle is filled with some amount of water, which acts as the "propellant" for the launch. Since water is about 100 times heavier than air, the expelled water produces more thrust than compressed air alone.
Fundamentally, pressure is defined as force per unit area. What is the source of the force in a gas sample? A) The force is from gravity acting on the particles. B) The force is composed of the sum of the collisions only between gas molecules. C) The force is composed of the sum of the collisions only between the gas molecules and the container. D) The force is composed of the sum of all collisions--between the gas molecules, each other and the container. E) The force was imparted to the container in its initial filling, a transfer of momentum.
Answer:
Option C
Explanation:
Given
Pressure = Force /Area
For any gas sample, force is defined as basically the force exerted by the gas molecules when they strike the surface (with in which they are contained) and bounce back.
Hence, Option C is the correct
Which is the correct Lewis structure for ethylene, CHA?
H
H
H H
1
CEC
1 1
H
H
C
C:
H
A.
H
B.
H
н
H
1
С
с
C.
С
1
н
H
H
C.
H
D
•HlclH|
H
I-Ö-I
E
ΟΑ. Α A
OB.
B
Ос. с
ODD
ОЕ Е E
Answer:
:c: H* : A: :C: H* :A: :C: H* :A:
A father is homo….zygou dominant for green eyes, the mother is heterozygous. How many of the offspring will have green eyes?
Answer:
100%
Explanation:
Father - EE
Mother - Ee
¿Por qué el Cirque du Soleil es una organización? ¿Qué características tiene?
What the use of physics in our life
Answer:
the use of physics in our life is to be a science student.
what factors could enhance memory and kept constant? and why
To help make sure information goes from short-term memory to long-term memory, you can use memory-enhancing strategies. One strategy is rehearsal, or the conscious repetition of information to be remembered. Think about how you learned your multiplication tables as a child.
Proven ways to protect memory include following a healthy diet, exercising regularly, not smoking, and keeping blood pressure, cholesterol, and blood sugar in check. Living a mentally active life is important, too. Just as muscles grow stronger with use, mental exercise helps keep mental skills and memory in tone.
According to one study, mental stimulation like reading can help protect memory and thinking skills, especially as you age. The authors even suggest that reading every day can slow down the late-life cognitive decline. ... The act of reading helps to heighten overall brain function and increase memory.
Let's take a deeper dive into evidence-based exercises that offer the best brain-boosting benefits.
Have fun with a jigsaw puzzle. ...
Try your hand at cards. ...
Build your vocabulary. ...
Dance your heart out. ...
Use all your senses. ...
Learn a new skill. ...
Teach a new skill to someone else. ...
Listen to or play music.
Which of the following situations would have the fastest speed?
Sound in a vacuum
Light in a vacuum
Sound in a solid
Light in a solid
sound in vacuum
Explanation:
because as u turn a vacuum on it make noise instant when u make sound from a solid object it takes a while to do thing starting slow then going fast in different objects