Answer:
A. evaporation
Explanation:
Evaporation is a surface phenomenon as the molecules of the surface gets sufficient energy to overcome the force of attraction which will help in converting to the vapor phase.
What is the purpose of using the string to tie the forelegs and hind legs during dissection?
Answer:
To holds the legs apart without rupturing any vein
Explanation:
The purpose of using string to tie the forelegs and hind legs during dissection is to hold the legs apart without rupturing ant vein or artillery for easy dissection procedure( the dismembering of the body of a deceased animal or plant to study its anatomical structure)
when tieing the forelegs and the hind legs the same string is used to tie them and the string is then passed/looped under the dissecting table/tray this way the legs will be held apart and the dissection can commence.
An electrical device with a resistance of 100 allows a current of 2A to flow through it what is the voltage drop across the device
Answer:
200 Volts
Explanation:
V = I x R
I = 2A
R = 100 Ohms
V = 2 x 100
V = 200
Is pure water a acid or a base?
Answer:
The pure water is neutral since its PH is 7
Answer:
NEITHER.
Explanation:
it is neutral
The first device Faraday invented based on Ørsted’s observation was the motor. What did this device do?
Answer:
Faraday’s first device, a motor, used electricity and magnetism to create motion.
Explanation:
just trust me on this one
Rock salt contains sand and salt. A student mixed rock salt in warm water. Describe how the student would separate out the sand, salt and water from the mixture formed
Answer:
Explanation:
First, he can add the rock salt to the water and mix it well. Then he can remove the sand by decantation, after the sand has sedimented. He can seperate the water from the salt by evaporation. He should evaporate the water completely and capture the steam. the steam will cool into water. After evaporating completely, the salt will remain in the container
A power cycle operates between a lake’s surface water at a temperature of 25 °C and water at a depth whose temperature is 6 °C. At steady state the cycle develops a power output of 14 kW, while rejecting energy by heat transfer to the lower temperature water at the rate 14,400 kJ/min. Determine the thermal efficiency of the power cycle, the maximum thermal efficiency for any such power cycle, and whether the power cycle is possible.
Answer:
[tex]\eta_{real} = 5.512\,\%[/tex], [tex]\eta_{max} = 6.373\,\%[/tex]. Possible.
Explanation:
The thermal efficiency of the real power cycle is determined by the following expression:
[tex]\eta_{real} = \frac{\dot W}{\dot Q_{H}}\times 100\,\%[/tex]
Where:
[tex]\dot W[/tex] - Power output of the power plant, in kW.
[tex]\dot Q_{H}[/tex] - Heat transfer rate from lake surface level, in kW.
The heat transfer rate from lake surface level is the sum of the heat rejection rate and the power output. That is:
[tex]\dot Q_{H} = \left(14,400\,\frac{kJ}{min} \right)\cdot \left(\frac{1}{60}\,\frac{min}{s} \right) + 14\,kW[/tex]
[tex]\dot Q_{H} = 254\,kW[/tex]
Now, the real efficiency of the power cycle is:
[tex]\eta_{real} = \frac{14\,kW}{254\,kW} \times 100\,\%[/tex]
[tex]\eta_{real} = 5.512\,\%[/tex]
Besides, the maximum possible efficiency for any power cycle is based on Carnot's cycle efficiency, whose formula is:
[tex]\eta_{max} = \left(1-\frac{T_{L}}{T_{H}} \right)\times 100\,\%[/tex]
Where:
[tex]T_{L}[/tex] - Temperature of the cold reservoir, in K.
[tex]T_{H}[/tex] - Temperature of the hot reservoir, in K.
The maximum efficiency of the cycle is:
[tex]\eta_{max} = \left(1-\frac{279.15\,K}{298.15\,K} \right)\times 100\,\%[/tex]
[tex]\eta_{max} = 6.373\,\%[/tex]
The cycle is possible as [tex]\eta_{real} \leq \eta_{max}[/tex], observing the Second Law of Thermodynamics.
A student wishes to make the magnetic force exerted by the electromagnet shown below greater. Which procedure step could the student follow to accomplish this goal?
Answer:
Increase the number of loops in the coil.
Explanation:
Base on the scenario been described in the question, if the student wishes to increase the make the electromagnetic greater, the student should Increase the number of loops in the coil. By so doing, the electromagnetic force will be greater
En una barra de 6m que se utiliza como palanca se coloca el fulcro a 2 m de distancia del extremo derecho, como se muestra en la figura. En ese mismo extremo se requiere soportar una carga de 90N. Despreciando el peso de la palanca, determinada Fp, VMI, VMR y la eficiencia del sistema.
Answer:
Fp = 45 N
VMR = 2
VMI = 2
Efficiency = 100%
Explanation:
English Translation
In a 6m bar that is used as a lever, the fulcrum is placed 2m away from the right end, as shown in the figure. At that same end it is required to support a load of 90N. Neglecting lever weight, determined Fp, VMI, VMR and system efficiency
Solution
With the diagram not massively needed to solve this question.
Although, the load of 90 N is placed at the right end of the bar, the fulcrum is placed 2 m from that right end and the balancing force or effort is placed at the extreme most left end of the 6 m bar.
Taking moment about the fulcrum,
The sum of clockwise moments must balance the sum of anti-clockwise moments.
(Load) × (Distance of load from the fulcrum) = (Balancing force) × (Distance of balancing force from fulcrum)
Load = L = 90 N
Distance of load from the fulcrum = 2 m
Balancing force or Effort = Fp = ?
Distance of balancing force from fulcrum = 6 - 2 = 4 m
90 × 2 = Fp × 4
Fp = (180/4) = 45 N
The mechanical advantages are them given as
VMR = (Load)/(Effort) = (90/45) = 2
VMI = (Distance of Effort from the fulcrum)/(Distance of Load from fulcrum) = (4/2) = 2
Efficiency is then given as the VMR divided by VMI in percentage terms
Efficiency = 100% × (VMR/VMI)
Efficiency = 100% × (2/2) = 100%
Hope this Helps!!!
Which formula is used to calculate average velocity?
Va
o v
;
Vave
O V =
Answer:
Vav=total distance/total time
Where would you find the sun on this HR diagram?
A
B
C
D
The Answer Was (A) I Chose It And Got It Correct! I Have Proof For You In The Attachment, Your Welcome! ^_^
Answer:
C
Explanation:
That is where the most heat and light is showing on this diagram.
The sun on this HR diagram is placed at region A. The correct option is A.
What is an HR diagram?
The Hertzsprung-Russell (HR) diagram is a plot of stars that shows their luminosity (or brightness) versus their temperature or spectral type. The HR diagram is divided into several main parts:
Main sequence: This is the prominent diagonal band that extends from the upper left (hot, bright stars) to the lower right (cool, dim stars). The main sequence represents stars that are fusing hydrogen in their cores and is where most stars, including the Sun, spend the majority of their lives.
Giants and supergiants: These are stars that are much larger and more luminous than main-sequence stars, and are found above and to the right of the main sequence. Giants and supergiants are typically older stars that have exhausted the hydrogen fuel in their cores and are in the later stages of their evolution.
White dwarfs: These are the small, dense remnants of stars that have exhausted their nuclear fuel and have shed their outer layers. White dwarfs are found at the lower left of the HR diagram and are the final stage of evolution for stars like the Sun.
Instability strip: This is a narrow region of the HR diagram that includes some of the most variable stars, such as Cepheid variables and RR Lyrae variables. These stars pulsate in size and brightness over a regular period of time, making them useful for measuring distances to other galaxies.
By studying the position of stars on the HR diagram, astronomers can learn about their size, age, temperature, and luminosity, and use this information to develop models of stellar evolution and the history of the universe.
In this question,
The Sun is a main-sequence star, meaning it is in the phase of its life cycle where it is fusing hydrogen in its core to form helium.
On an HR diagram, the Sun falls near the center of the main sequence, which is a diagonal band that extends from the upper left (hot, bright stars) to the lower right (cool, dim stars). The temperature of the Sun is about 5,500°C, which places it in the spectral class G2V.
Therefore, The sun resides in the region of A.
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How are sound waves different from the ripples that spread across water?
Answer:
.
Explanation:
Sound waves are caused by vibration ripples in water are caused by disturbance in the molecules
Sound waves are longitudinal (the particles move in the same direction as the wave) as opposed to transversal waves (for example, in a sea wave, the water particles move up and down to form the wave). ... Water being incompressible is one of the reasons why sound waves move much faster in water than ripples.
Mark me brainliest please
How is one second time defined in SI system?
Answer:
The second is defined in terms of a cesium-atom laser and its vibrations.
Explanation:
However, real time is defined in terms of the mean solar day, and it is thus necessary to add leap seconds to the atomic clocks to keep them in line with the astronomical clocks.
Hope this helped :)
In what year will there be 8 billion people in the world?
2020
2022
2024
2030
Answer:
2030
Explanation:
Derive velocity-time relation from velocity-time graph
Explanation:
hope this helps you
.....,.......
Please Answer as soon as possible
1. How much energy is transformed by an electric lamp in 100 s if a current of 0.22 A flows through it when it is connected to a 120 V supply?
2. A 10 V power supply pushes a current of 5.0 A through a resistor. At what rate is energy transferred to the resistor?
3. A tropical fish tank is fitted with an electric heater, which has a power rating of 30 W. The heater is connected to a 12 V supply. What current flows through the heater when it is switched on?
Answer:
1. 2.64 kJ 2. 50 W 3. 2.5 A
Explanation:
1. Energy transformed in the lamp, E = IVt where I = current = 0.22 A, V = voltage = 120 V and t = time = 100s
E = 0.22 A × 120 V × 100 s
= 2640 J
= 2.64 kJ
2. The rate at which energy is trans ferred to the resistor is the power.
Power, P = IV where I = current = 5.0 A and V = voltage = 10 V
P = 5.0 A × 10 V = 50 W
3. Since Power P = IV
Current through the heater I = P/V P = 30 W and V = 12 V
I = 30 W/12 V
= 2.5 A
Gravity and magnetism are _ forces.
A. contact
B. field
C. tension
D. normal
Answer:
B. Field
Explanation:
Gravity and Magnetism are defined as non-contact forces, so that eliminates option A.
Tension is found in a rope or a spring, and is a force in itself, so that eliminates option B.
A normal force is one that is perpendicular to the direction of a slope, so that eliminates option D.
At exactly the same time Daisy and David both step off a diving platform 5 m high. David jumps off and out from the platform whereas Daisy just takes a step from a standing position. Who will reach the water first?
none of them
Explanation:
the horizontal speed doesn't matter and if i got it right both of them started from the same height and both of them fell to the water (none of the jumped *higher only farther) and that's the only thing that matters. so they'll both end up there at the same time cause only gravity is affecting their movement process among the way.
17.
What type of energy wave is highest in energy? (3 points)
Radio wave
Microwave
Visible light
Gamma wave
Answer:
Gamma rays
Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.
Explanation:
Since the moon orbits the earth approximately every 27 days, there is a lunar eclipse approximately every 27 days.
True
False
Answer:
No ! its False
Explanation:
We all know , we dont have lunar eclipse in every 27 days . They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
Answer:
False
Explanation:
Yes, the moon orbits the Earth every 27 days, actually, it's precisely 27.3, but that does not mean that there is a lunar eclipse every 27 days. A lunar eclipse only happens when the full moon is directly in Earth's shadow. The moon does not pass through Earth's shadow often because of the Earth's axis. Earth only sees a couple of lunar eclipses a year.
On which body in the solar system would some life forms from earth be most likely to survive?
The most likely place for life forms from Earth to survive in the solar system would be on Mars, which is present in Option A, as the conditions on Mars are harsh for most life forms, some extremophile organisms on Earth can survive in similarly extreme conditions.
What is Mars' climate?Mars has a more similar environment to Earth than any other planet or moon in the solar system, as it has a thin atmosphere that contains some of the same gases as Earth, including carbon dioxide, nitrogen, and argon. Mars also has seasons, polar ice caps, and evidence of liquid water in the past, but the surface of Mars is not habitable for most Earth organisms but some similarities do exist, however, that make it similar to Earth.
Hence, the most likely place for life forms from Earth to survive in the solar system would be on Mars, which is present in Option A.
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The question is incomplete, complete question is below
On which body in the solar system would some life forms from earth be most likely to survive?
A)Mars
B)jupiter
A jeweler is determining the optical properties of an unknown blue gemstone. She uses an angle of incidence of 62°, and measures an angle of refraction of 30°. Assuming the index of refraction of air is 1.0, what is the index of refraction of the gem?
Answer:
n = 1.76
Explanation:
According to the rule of ( n1 sin theta1 = n2 sin theta2 )
we know both angles so we insert them to the law and apply n1 = 1
so 1/2 = n2 sin 62 and we get the final answer
Answer:
1.77
Explanation:
Can anyone solve this?? I need help ASAP!! Tysm
Answer:
The answer would be D. electrical energy into mechanical energy.
Explanation:
Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a heat engine converts heat energy to mechanical energy.
An electric mixer is one of the many examples of devices.
how do wind, water, and waves cause erosion?
Answer:
Over time
Explanation:
When the waves crash against the rocks (erosion) small bits of rock begin to wear off. Over a lot of years lots of rock would've worn off.
Answer:
when there is high wind e.g hurricane it can cause soil erosion, when there is flood it can cause soil erosion, when there are waves it can wear out the land and cause soil erosion
Explanation:
when there is high wind e.g hurricane it can cause soil erosion, when there is flood it can cause soil erosion, when there are waves it can wear out the land and cause soil erosion
To do work, this truck uses energy stored in chemical fuel and an electrical battery. An illustration of truck with a wide arrow away from it labeled input energy? J and it splits into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. How much total energy does this truck put out? 50 J 250 J 400 J 800 J
I think it may be 800 J.
Answer:
(d)
Explanation:
I took the test
Total energy does this truck put out is 800 joule.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Given in question energy split into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. Total energy does this truck put out is 800 joule.
Total energy does this truck put out is 800 joule.
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Identify the three subatomic particles.
Where are each of the particles located
within the atom?
Which of the following phrases best describes a physical model?
A. An exact copy of an object, system, or process
B. A chemical formula
C. A graph or equation
D. A representation of an object, system, or process
Answer:D a representation of an object system or process
Explanation:
The phrase that best describes a physical model is an exact copy of an object, system or process.
What is meant by a physical model ?A physical model is defined as a model of any object which can be moved or can be held.
Here,
The physical model can be defined as a larger or smaller copy of the object which is to be represented.
The physical models are made for the perfect examination and study of the the physical characteristics of the particular object.
From the above given data,
There is only one example that can be considered as a physical model of a system.
Chemical formula, graph or equation are just a graphical or written representation of a system.
We know that the physical model must be a similar copy of the system,
An exact copy of an object, system or process is an example of physical model.
Hence,
The phrase that best describes a physical model is an exact copy of an object, system or process.
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The fisherman steps off a boat, which is in the water, onto a dock. What happens?
A 5.4-kg ball is thrown into the air with an initial velocity of 35.2 m/s.a
How much kinetic energy does the ball have?
According to Hooke's law, when the applied force that stretches a spring increase, the extension ( stretching ) will also increase.
TRUE OR FALSE??
Answer:
true
Explanation:
Two stars orbiting each other are separated by 6.67 AU and revolve around their common center of gravity in 10 years. Use Newton’s form of Kepler’s third law to calculate the combined mass of the 2 stars in solar masses.
Answer:
The combined mass of the two stars is 2.9417 solar masses.
Explanation:
The mathematical expression for Kepler's third law is;
[tex]P^{2}[/tex] = [tex]\frac{4\pi ^{2} }{k^{2} (M_{1} + M_{2} }a^{3}[/tex]
Where: P is the period in days, a is the semimajor axis in AU, [tex]M_{1}[/tex] is the mass of the first star, [tex]M_{2}[/tex] is the mass of the second star and k is the Gaussian gravitational constant.
Given that;
P = 10 years = 3670 days (including two leap years)
a = 6.67 AU
k = 0.01720209895 rad
[tex]\pi[/tex] = [tex]\frac{22}{7}[/tex]
The sum of the masses of the two star can be determined by;
[tex](M_{1} + M_{2})[/tex] = [tex]\frac{4\pi ^{2} }{P^{2}k^{2} } a^{3}[/tex]
= [tex]\frac{4*(\frac{22}{7}) ^{2} } {(3650)^{2} * (0.01720209895)^{2} } (6.67)^{3}[/tex]
= [tex]\frac{11724.29601}{3942.2904}[/tex]
= 2.9417 solar masses
Thus the combined mass of the two star is 2.9417 solar masses.