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.
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.
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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%
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A bottlenose dolphin can hear sounds with frequencies up to 1.5 x 10^5 Hz. If the speed of sound in sea water is approximately 1.5 x 10^3 m/s, what is the wavelength of the wave thae dolphin can hear?
a
2.25 x 10^2 m
b
1 x 10^-2 m
c
1 x 10^2 m
Answer:
b. 1.0 × [tex]10^{-2}[/tex] m
Explanation:
The wavelength of a wave is the distance between successive crests or troughs. It is measured in meters, and related to velocity and frequency of the wave by:
v = fλ
Where v is the velocity, f frequency and λ is the wavelength of the wave. Given that; f = 1.5× [tex]10^{5}[/tex] Hz and v = 1.5 × [tex]10^{3}[/tex], then:
λ = [tex]\frac{v}{f}[/tex]
= [tex]\frac{1.5*10^{3} }{1.5*10^{5} }[/tex]
= 1.0 × [tex]10^{-2}[/tex] m
The wavelength, λ, of the wave is 1.0 × [tex]10^{-2}[/tex] m.
battery of 12 V supplies charge of 1000 C to a device work battery
Answer:
W = 12 kJ
Explanation:
We have,
Voltage of a battery is 12 V
Charge supplied by the battery is 1000 C
It is assumed to find the work is done by the battery in moving the charge. The work done is given in terms of voltage as :
[tex]W=qV\\\\W=1000\times 12\\\\W=12000\ J[/tex]
or
W = 12 kJ
So, the work of 12 kJ is done by battery in moving charges.
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:
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
10. A cyclist reaches the top of a hill at 5.0 m/s and accelerates downhill, reaching the bottom
in 8.3 s with a speed of 11.4 m/s. How long was the hill (total length down)?
Answer:94.62 m
Explanation:Distance=speed×time
Downhill,
Distance= 11.4 m/s×8.3 m/s
Therefore, Distance= 94.62 m (downhill)
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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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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.
How do patterns in motion of the stars tell us about the origin of our Universe ?
Answer:
Actually, the motion of the stars and galaxies tell us about the origin of the Universe.
You see, the light frequency of the waves we receive tell us that the galaxies
are moving away from us, and the more distant they are, the go away faster.
Now, in the outer space there's no friction at such, and according to Newton's First Law, an object won't change its direction and velocity unless an external force act on that object. That means this motion of the galaxies is due to an initial force, like an explosion, which occasionate the seperation between galaxies, that's why the Big Bang Theory exists.
So, that's how the motion of stars and galaxis tell us something about the origin of all.
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:
Which formula is used to calculate average velocity?
Va
o v
;
Vave
O V =
Answer:
Vav=total distance/total time
4. What is the amplitude of the waves shown in the diagram below?
Answer:
7.5 m
Explanation:
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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True or false? All three types of ionising radiation have the potential to make cells become cancerous or even kill them completely.
Answer:
true
Explanation:
All three types of ionising radiation have the potential to make cells become cancerous or even kill them completely.
The image produced by a concave mirror is _____
Answer : virtual or real
Answer:
Mostly real
Explanation:
Concave mirrors can have real images.
“ If the object is further away from the mirror than the focal point, the image will be upside-down and real meaning that the image appears on the same side of the mirror as the object.”
The image produced by a concave mirror is virtual or real.
What is concave mirror?When a hollow sphere's inside surface serves as the reflecting surface and the cut part's outside is painted, the result is a mirror. The term "concave mirror" refers to this kind of mirror.
Concave mirrors have certain characteristics.
When light hits the concave mirror's reflecting surface, it converges at a single point and reflects back. A converging mirror is another name for it as a result.A magnified, upright, virtual image can be created by placing the concave mirror very close to the object.The concave mirror creates an image that might be little or large, real or virtual.Learn more about Concave mirrors here:
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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:
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
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:
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someone help me plz
Answer:
Aerobic exercise includes?
(C) All activities that make you tired and short of breathe.
2. Which choice is an intense exercise that involve short burst of activity in which the muscles worked so hard that they produce energy without using energy?
(B) anaerobic exercise
Explanation:
1.
What is the most direct type of heat transfer?
radiation
conduction
Answer:
conduction is the correct answer
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.
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?
True or false? One reason gases are easy to compress is because their particles have higher energy.
The given statement is true as molecules in gas are far away from each other due to weak forces of attraction.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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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.
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
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
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