Answer:
Wc - Ws = 25.25 - 23.075 = 2.175 weight of water displaced
Since water has a density of 1 means the chain has a volume of 2.175 cm^3
The density of the chain is M / V = 25.25 g / 2.175 cm^3
ρc = 11.6 which is less than pure gold of 19.32
This is all that one can say about the purity of gold in the chain because one does not know the density of other material in the chain.
That means that one does not know how much pure gold is actually in the chain without knowing the density of the rest of the chain.
The purity of gold in the ornament is approximately 99.95% which is determined by the Archimedes principle.
The apparent weight of the chain in water is less than its actual weight due to the buoyant force acting on it.
The volume of the chain.
Density of gold = 19.32 g/cm³
Weight of the chain = 25.25 g
Volume of the chain = W ÷ d
Volume of the chain = 25.25 ÷ 19.32
Volume of the chain = 1.307 cm³
The volume of water displaced.
The apparent weight of the chain in water = 23.075 g
Volume of water displaced = 25.25 - 23.075
Volume of water displaced = 2.175 g
The density of the chain is:
Density of the chain = 25.25 ÷ 1.307
Density of the chain = 19.33 g/cm³
The purity of gold.
Purity of gold = (19.32 ÷ 19.33 ) × 100
Purity of gold = 99.95%
Therefore, The purity of gold in the ornament is approximately 99.95%.
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A ball is thrown straight up from the ground level, with an initial velocity of 34.3 m/s.34.3 m/s. How high is the ball thrown
The maximum height attained by the ball is 60 m.
What is the maximum height?We know that the maximum height can be obtained from the equation;
v^2 = u^2 - 2gh
v = final velocity
u = initial velocity
g = acceleration due to gravity
h = maximum height
Since the final velocity is 0 m/s at maximum height then;
u^2 = 2gh
h = u^2/2g
h = (34.3)^2/2 * 9.8
h = 60 m
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What adaptation of a cheetah is shown in the image?
a cheetah running
Brown color to blend in with the grass
Long and strong legs to run fast
Spots on the fur to keep warm
Strong sense of smell to catch predators
The adaptation of a cheetah is shown in the image which shows it running is its long and strong legs to run fast which is denoted as option B.
What is Adaptation?These are the physical and behavioral features which ensures that they survive in their changing environment.
Cheetahs are known to have long and strong legs which is the reason why it runs at a very high speed.
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Answer: Option (B) is correct
Explanation: Hope it helps!
Good luck!
From your results on page 29, decide whether you are able to demonstrate that the masses of the 4 different baskets differ meaningfully. That is, do the baskets' masses differ by more than the range of measurement error that was obtained by repeatedly measuring the mass of one basket?
Yes, it was demonstrated that the masses of the 4 different baskets differ meaningfully.
If we compare the two ranges, the differences are significant because the error range for the same basket was less than the differences between different baskets.
The Error range is a measurement of the degree of uncertainty attached to a number and is defined as the difference between the greatest and lowest error values.
So, Yes the baskets masses differ by more than the range of measurement error that was obtained by repeatedly measuring the mass of one basket.
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A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -10.0 kJ, what is the speed of the skier on reaching the bottom of the slope
The speed of the skier on reaching the bottom of the slope is 25.43 m/s.
Kinetic energy of the skier on reaching the bottom of the slope
Kinetic energy on reach the bottom = P.E - 10 kJ
Kinetic energy on reach the bottom = (60)(9.8)(50) - 10 kJ
Kinetic energy on reach the bottom = 19.4 kJ = 19,400 J
Speed of the skier on reaching the bottom of the slopeK.E = ¹/₂mv²
2K.E = mv²
v² = 2K.E/m
v² = (2 x 19,400)/(60)
v² = 646.667
v = √646.667
v = 25.43 m/s.
Thus, the speed of the skier on reaching the bottom of the slope is 25.43 m/s.
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A source generates 40 waves per sec. if the wavelength is 8 cm. calculate the time waves takes to reach a wall 120m from the source?
Answer:
37.5 Seconds
Explanation:
Speed = frequency * Wavelength
We can find the Frequency by the information given, Frequency = waves per second .
40 Waves per second, = 40 Hz
Wavelength = 8cm
Cm = M
8cm/100 = 0.08m
Speed = 40 Hz * 0.08m
Speed = 3.2m/s
Speed = Distance / time taken
Time = Distance / Speed
Time = 120 / 3.2
Time = 37.5 seconds
Imagine you want to create a model of Solar system (and beyond) with the Sun
represented by a beach ball of diameter 60 cm = 0.60 m. (i.e. of radius 30 cm = 0.30m). On that same scale:
What is the diameter of the Milky Way?
And the diameter or Radius of Earth
Using the scale model of the Sun given;
The diameter of the Milky Way = 4.28 × 10¹¹ mThe diameter of the Earth = 5.44 × 10⁻³ mWhat is the diameter of the Milky Way?The diameter of the Milky Way is about 1 × 10¹⁸ km.
The diameter of the Sun is about 1.4 × 10⁶ km
The diameter of the Earth is about 1.27 × 10⁴ km.
Using the scale model of the Sun given, the diameter of the Milky Way = (1 × 10¹⁸ km/1.4 × 10⁶ km) × 0.6 m
The diameter of the Milky Way = 4.28 × 10¹¹ m
Using the scale model of the Sun given, the diameter of the Milky Way = (1.27 × 10⁴ km/1.4 × 10⁶ km) × 0.6 m
The diameter of the Earth = 5.44 × 10⁻³ m
In conclusion, the diameter of the Milky Way is far bigger than the Sun while the diameter of the Sun is about 5400 times bigger than the Earth.
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when a car hits a hole in the road, the spring shown in the picture compresses by 20 mm.
the spring constant = 90kN/m
calculate the energy stored in the spring by this compression
The energy that is stored in the spring is 0.018 J.
What is Hooke's law?Hooke's law states that as long as the elastic limit is not exceeded, the extension is directly proportional to the load.
Now we have the following;
The compression = 20 mm or 0.02 m
The spring constant = 90kN/m
Energy stored in the spring = 1/2Ke^2
= 1/2 * 90kN/m * (0.02 m)
= 0.018 J
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One way to measure how long Jupiter takes to rotate is to watch the giant storms in its atmosphere go around. A more fundamental way to measure the rotation is to:
A more fundamental way to measure the rotation of Jupiter is to measure the changes in the planet's radio waves, which are controlled by its magnetic field.
Rotation of JupiterJupiter, in contrast to the inner terrestrial planets, is a sphere made almost completely of hydrogen and helium. There are no craters or mountains that spin into view after a set amount of time on Jupiter, unlike Mars or Mercury, which you can follow to determine the rotation speed.Out of all the planets in the Solar System, Jupiter rotates the most quickly. Given that Jupiter is also the largest planet in the Solar System, this is quite an accomplishment because it is rapidly rotating a vast amount of mass. The planet's equator protrudes due to its rapid spin. Jupiter doesn't appear to be a perfect sphere; rather, it resembles a squashed ball. Even with a modest telescope in your backyard, you can see the bulge at the equator.Observing the enormous storms that circle Jupiter's atmosphere can help determine how long it takes for Jupiter to revolve. Monitoring the variations in the planet's radio waves, which are governed by its magnetic field, is a more basic technique to gauge the rotation.
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WILL GIVE BRAINLIST TO THE CORRECT ANSWER!
Read the two passages.
Excerpt from The Gettysburg Address, 1863
By Abraham Lincoln
Four score and seven years ago, our fathers brought forth upon this continent a new nation: conceived in liberty, and dedicated to the proposition that all men are created equal.… Now we are engaged in a great civil war…[and many have died]. It is for us the living…to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us ...that we here highly resolve that these dead shall not have died in vain...that this nation, under God, shall have a new birth of freedom...and that government of the people...by the people...for the people...shall not perish from this earth.
Excerpt from John F. Kennedy’s Inaugural Address, 1961
By John F. Kennedy
In the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger; I do not shrink from this responsibility.… I welcome it. I do not believe that any of us would exchange places with any other people or any other generation. The energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it…and the glow from that fire can truly light the world. And so, my fellow Americans…ask not what your country can do for you…ask what you can do for your country. My fellow citizens of the world…ask not what America will do for you, but what together we can do for the Freedom of Man.
According to the supporting details, what do the speeches by Lincoln and Kennedy have in common?
A. Both speeches mention that the presidents do not welcome the role of defending freedom.
B. Both speeches express they do not want those who have died during a war to have died in vain.
C. Both speeches indicate a desire to motivate and unite Americans in order to preserve freedom.
D. Both speeches pose a question for each American to ask themselves.
Answer:
the best answer would be c
Explanation:
A weeping willow tree has hard stem from which branches and leaves grow.Its roots griw long.What function of the stem and roit do the sentences describe?
Answer:
The weeping willow is a gentle, graceful tree, but willow tree roots are very shallow and invasive. This means it's not the best backyard tree option for many
Explanation:
A tank containing water has walls 2.50 cm thick made of glass of refractive index 1.550. Light from the outside air strikes the glass at a 41.3o angle with the normal to the glass. Find the angle the light makes with the normal in the water.
The normal in the water is 29.8°
Let
[tex]n_i=[/tex] the index of refraction for the material with incident light,
[tex]n _r[/tex] = the index of refraction for the material with refracted light,
[tex]\theta_i=[/tex] the angle of incidence
[tex]\theta_r[/tex] = the angle of refraction.
Applying Snell's law
[tex]n_isin\theta_i=n_rsin\theta_r[/tex]
Given
[tex]n_a=1, n_g=1.550, n_m=1.329n[/tex]
a)
From air to glass
[tex]n_a sin\theta_1[/tex][tex]=n_gsin\theta_2[/tex]
[tex]1\\sin *41.3 = 1.550 *sin\theta_2[/tex]
A normal from glass to water
[tex]n_g sin\theta_2 =n_m sin \theta_3 \\1.550\cdot\sin25.2\degree=1.329\cdot\sin\theta_3\\1.550*sin25.2=1.329*sin\theta_3 \\\theta_3=\arcsin({1.550\cdot \sin25.2\degree \over 1.329})\\\approx29.8\theta_3 =arc sin( 1.3291*550*sin25) ≈ 29.8[/tex]
Hence the normal in the water is 29.8°
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The average velocity of a plane during a flight was 9.0 m/s. How long did it take the plane to travel 5.0 km
Answer:
The time taken is 555.56 s.
Explanation:
The average velocity is the ratio of the net velocity to the time required to achieve net velocity.
The formula of average velocity is,
v(av)=d/t
Given d=5.0 km which is 5*1000 m=5000 m and v(av)=9.0 m/s.
Therefore 9=5000/t
t=5000/9
t=555.56
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What is the magnitude of the net electric field at the origin produced by this distribution of charge?
The magnitude of the net electric field at the origin due to the given distribution of charge is E_net = 4kQ/πR².
Given:
A semi-circle distribution with radius 'r'
Charges '+Q' and '-Q'
Calculation of net electric field:
Step 1:
The electric field for a charge is given as:
E = (kλ/R) i + (kλ/R) j - ( 1 )
where, k is Coulomb's force constant
λ is charge density
R is separation distance between the charges
i & j are unit vectors for x-axis and y-axis respectively
Step 2:
The electric field due to charge +Q is given as:
E₁ = (kλ/R) i - (kλ/R) j - ( 2 )
The electric field due to charge -Q is given as:
E₂ = (kλ/R) i + (kλ/R) j - ( 3 )
Step 3:
Thus, the net electric field will be given as:
E_net = E₁ + E₂
Applying values in above equation, we get:
E_net = (kλ/R) i -(kλ/R) j + (kλ/R) i + (kλ/R) j
=( kλ/R) [ i - j + i + j ]
= 2i (kλ/R) -( 4 )
Step 4:
Now, we know that the linear charge density is given as:
λ = Charge/length
= Q/(πR/2)
= 2Q/πR
Applying the value in equation 4, we get:
E_net = 2i (k(2Q/πR)/R)
= 4i (kQ/πR²)
= 4kQ/πR²
Therefore, the net electric field due to the given charge distribution is of magnitude 4kQ/πR² directed along the positive x-axis.
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Suppose that a voltage surge produces 140 V for a moment in a 115-V line. What will temporarily be the output of a 100-W light bulb assuming its resistance does not change
The temporarily be the output of a 100-W light bulb is 148 watt.
To find the answer, we need to know about the resistance of the bulb.
What's the mathematical expression of resistance of the bulb in term of power and voltage?Mathematically, power= voltage²/resistanceSo, resistance= voltage²/powerWhat's the resistance of the bulb, if 115 volt is applied to 100 watt bulb?Resistance= 115²/100= 132.25 Ohm
What's the power of the bulb, if 140 volt is applied to it?Power= voltage²/resistance
= 140²/132.25
= 148watt
Thus, we can conclude that the temporary output of the bulb is 148 watt.
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which two factors decrease as the kinetic energy of the particles in an object decrease
The particle temperature and the valency of the atom in the particles are the two parameters that decrease with the kinetic energy of the particles in an item.
What is temperature?Temperature directs to the hotness or coldness of a body. In clear terms, it is the method of finding the kinetic energy of particles within an entity. Faster the motion of particles more the temperature.
Because an item possesses kinetic energy when it is moving, anything that prevents that motion will reduce the kinetic energy of the object.
A valence electron is an electron in the outermost shell associated with an atom that can experience the innovation of a chemical bond if the outer shell is not closed. Both atoms contribute one valence electron to create a shared pair.
More the valence electron more the motion of atoms results in more kinetic energy,
Hence the two factors decrease as the kinetic energy of the particles in an object will be the particle temperature and the valency of the atom in the particles.
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Radioactive fuel rods from power plants emit what kind of energy? A. mechanical B. nuclear C. thermal
Answer:
B. Nuclear Energy
At a particular instant, a hot air balloon is 100 m in the air and descending at a constant speed of 2.0 m/s. at this exact instant, a girl throws a ball horizontally, relative to herself, with an initial speed of 20 m/s. when she lands, where will she find the ball? ignore air resistance.
Answer:
86.4 m horizontal from landing spot
Explanation:
Find out how long before the ball hits the ground
vertical speed of ball = -2 m/s gravity = - 9.81 m/s^2
find time to hit ground from 100 m
( height will be zero when it hits the ground)
0 = 100 - 2 t - 1/2 ( 9.81) t^2
use Quadratic Formula to find t = 4.32 seconds
horizontal speed of ball = 20 m/s
in 4.32 seconds it will travel horizontally 20 m/s * 4.32 s = 86.4 m
In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a
Answer:
A-Oil pressure relief valve.
Zoe has 25 grams of water (c = 4.186 joules over grams times degrees celsius) at 10°c, which she mixes with 12 grams of water at 30°c. assume that no heat is lost to the surroundings. what is the final temperature of the two liquids? the answer is expressed to the nearest whole number. –47°c –8°c 3°c 16°c
We use the expression Q = mC(T2-T1). We caclulate as follows:
Q absorbed = Q released
m1 C (T-T1) = -m2 C (T-T1)
C can be cancelled since they are the same substance.
m1 (T-T1) = -m2 (T-T1)
25 (T-10) = -12 (T-30)
T = 16.49 degrees Celsius
The final temperature of the two liquids is 16.49 degrees Celsius.
What is thermal energy?The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.
We use the expression Q = mC(T2-T1). We caclulate as follows:
Q absorbed = Q released
m1 C (T-T1) = -m2 C (T-T1)
C can be cancelled since they are the same substance.
m1 (T-T1) = -m2 (T-T1)
25 (T-10) = -12 (T-30)
T = 16.49 degrees Celsius
The final temperature of the two liquids is 16.49 degrees Celsius.
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PLEASE HELP!!!!
What is intelligence?
the emotional abilities of an individual to learn from experience, and to cope effectively with the demands of daily living
the ability to score well on standardized tests,
the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living,
how quickly an individual can reduce or eliminate stress
Answer:
the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living
Explanation:
Yes that can be understood by a simple example
Suppose two people are in exam
A difficult and logical question cameThe person can use his cognitive abilities faster can solve that[tex]\large\longrightarrow [/tex] Intelligence is the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living.
At what distance is the electrostatic force between two protons equal to the weight of one?.
0.118 m is the distance between the two protons.
Mass of proton = 1.6726 × 10⁻²⁷ kg
Weight of proton= 1.6726 × 10⁻²⁷ x 9.81 N
= 1.6408 × 10⁻²⁶ N
Charge of proton = 1.602 × 10⁻²⁹ C
The force between two protons = kq²/r² where, K is a proportionality
constant, q is a charge of proton and
r is the distance between two protons.
= 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²
To calculate distance :
Weight of proton= Force between protons
⇒ 1.6408 × 10⁻²⁶ N = 9 × 10⁹ × (1.602×10⁻¹⁹)²/r²
⇒ r = 0.118m
Therefore, 0.118 m is the distance between the two protons.
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Some people say the risk of hiv transmission from a healthcare provider (doctor, dentist, nurse, technician) is small. true or false? why?
Answer:. True
Explanation:
The risk of becoming infected from contact with an HIV-positive healthcare provider is indeed remote. The Centers for Disease Control and Prevention (CDC) have recommended the use of universal precautions by healthcare providers to minimize the risk of transmitting many infectious diseases, including hepatitis and HIV. The risk of transmission from patient to healthcare provider is far greater than from provider to patient.
"Some people say the risk of hiv transmission from a healthcare provider is small."
That statement is True. Because ...
There is NO statement on which public opinion is unanimous.
It can be something as innocuous as "The sky is blue during the day and rain makes the ground wet.", and you will never get 100% of the people to agree on it. There will still be some people who say it's True and others who say it's False.
And plus ... In this particular case, we're talking about a public health question. In today's political and cultural environment, marked by anti-science tendencies, a lot of people think that Science is not being truthful with us, it's all a big conspiracy, we are all being misled, and every individual should have the freedum to decide for himself. So when it comes to talking about something like the risk of HIV transmission, everybody is his own expert. Some will say the risk of transmission from a healthcare provider is substantial, and the rest will say it's small.
So the long sentence in the question is True. Some people do indeed say that.
1. You released a pendulum of mass 1kg from a height of 0.05m
b. If the pendulum loses 18% of the initial energy by the time it reaches the bottom, how fast is it going when it reaches the bottom?
c. If the pendulum loses another 7% of its remaining energy by the time it reaches the other side, how high up does it go?
d. After a few minutes the pendulum is no longer swinging at all, explain why this happens in terms of energy?
a. The speed of the pendulum when it reaches the bottom is 0.9 m/s.
b. The height reached by the pendulum is 0.038 m.
c. When the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
Kinetic energy of the pendulum when it reaches bottomK.E = 100%P.E - 18%P.E
where;
P.E is potential; energyK.E(bottom) = 0.82P.E
K.E(bottom) = 0.82(mgh)
K.E(bottom) = 0.82(1 x 9.8 x 0.05) = 0.402 J
Speed of the pendulumK.E = ¹/₂mv²
2K.E = mv²
v² = (2K.E)/m
v² = (2 x 0.402)/1
v² = 0.804
v = √0.804
v = 0.9 m/s
Final potential energyP.E = 100%K.E - 7%K.E
P.E = 93%K.E
P.E = 0.93(0.402 J)
P.E = 0.374 J
Height reached by the pendulumP.E = mgh
h = P.E/mg
h = (0.374)/(1 x 9.8)
h = 0.038 m
when the pendulum stopsWhen the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
Thus, the speed of the pendulum when it reaches the bottom is 0.9 m/s.
The height reached by the pendulum is 0.038 m.
When the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
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Summarize the differences between solids, liquids, and gases in terms of particle motion, shape, and compressibility.
Solids have a distinct volume and form. Although they have a specific capacity, liquids adopt the form of a container. Gases lack a distinct volume or form.
What is gas?Gas is a sample of matter that adopts the shape of the container in which it is housed and develops a uniform density inside the container.
a)Particle motion
Liquid molecules are more energetic than solid molecules. Further heating will cause the molecules to move so quickly that they won't stick together at all. The gas molecules have the highest energy content.
b)Shapes
Solids are discrete in their shape and volume. Although they take on the shape of the container, liquids have a specific volume. The form and volume of gases are ambiguous.
c)Compressibility
The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.
The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis.
Hence solids, liquids, and gases differentiate in terms of particle motion, shape, and compressibility.
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Answer:
In a solid, atoms vibrate or wiggle, but are locked in place. Solids have a rigid shape, and are hard to compress. In a liquid, atoms have some freedom to move. Liquids take the shape of their container, and are hard to compress. In a gas, atoms move freely. Gases have no definite shape, and are easy to compress.
Explanation:
The accepted value for the speed of sound is around 340 m/s. What are some reasons your value may be a little different from the accepted value
Answer:
The speed of sound depends on the medium thru which it travels in contrast to light (electromagnetic) which can travel thru a vacuum.
The speed of sound will depend on the density of the air thru which it travels - the density of air is particularly affected by
humidity - water vapor in the air contributes to less density
temperature - warmer is less dense
motion of air - if the air is not motionless the speed will be affected
There are a few reasons why the value for the speed of sound may be a little different from the accepted value of 340 m/s such as the temperature and humidity of the air, the presence of other gases, and the shape of the object.
The temperature of the air: The speed of sound increases as the temperature of the air increases. So, if you measure the speed of sound in air that is warmer than 20 degrees Celsius, your value will be slightly higher than 340 m/s.
The humidity of the air: The speed of sound decreases as the humidity of the air increases. So, if you measure the speed of sound in air that is more humid than 0%, your value will be slightly lower than 340 m/s.
The presence of other gases: The speed of sound is slightly different in different gases. So, if you measure the speed of sound in a gas other than air, your value will be different from 340 m/s.
The shape of the object: The speed of sound is slightly different in different shapes of objects. So, if you measure the speed of sound in an object that is not a sphere, your value will be slightly different from 340 m/s.
In addition to these factors, there are also some experimental errors that can contribute to a difference between the actual value and the accepted value. These errors can be caused by things like inaccurate measurements of the distance or the time, or by small variations in the experimental setup.
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can someone answer this pls
Answer:
See below
Explanation:
The vertical force in the R cable must equal the vertical force of the weight (since there is no vertical force in the L cable)
f sin30 = 150 then f-right = 300 N = L tension
The horizontal forces in the L and R cables must match
Horizontal : f-right = f-left = 300 cos 30 = 259.8 N = L tension
The comet-hunting astronomer who made a list of over 100 nebulae and galaxies that could be mistaken for comets was Group of answer choices
An Astronomer who made a list of 100 nebulae and galaxies that could
be mistaken for comets was Charles Messer's.
Charles Messier's was a very famous scientist in the field of Astronomy.
His research in appearance of Great comet filled spark to his passion
of Astronomy. On January 21, 1759 he put his thought of wrong
calculation of Delisle's and he described a faint glow resembling comet
had been seen earlier. Then after, he discovered great comet near
sword of Orion.
There are various tales of Charles Messiers which put him forward
towards his love of Astronomy.
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Which term below describes the amount of force exerted on a given area?
O A. Density
OB. Heat
OC. Temperature
OD. Pressure
The term above which describes the amount of force exerted on a given area is pressure
However, pressure is derived quantity.
What are derived quantities?
Derived quantities are those quantities which are obtained from the combination of fundamental quantities either by addition, division or multiplication
In conclusion, the term above which describes the amount of force exerted on a given area is pressure
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Pressure is the term which describes the amount of force exerted on a given area and is denoted as option D.
What is Pressure?This is described as the force per unit area of a substance and the unit is mmHg or pascal.
This is why pressure was chosen as the most appropriate choice in this type of scenario.
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J.J. Thomson discovered the electron by noticing that: A. molecules with the same atoms exhibited the same chemical properties. B. a beam of particles could be influenced by an electric or magnetic force. C. chemical compounds contained various combinations of at least two atoms. D. some particles in a beam were deflected when passed through a sheet of gold foil.
J.J. Thomson discovered the electron by noticing that a beam of particles could be influenced by an electric or magnetic force.. That is option B.
What is an electron?An electron can be defined as the part of an atom that is negatively charged and is found revolving round the nucleus of an atom.
J.J. Thomson was the scientist that discovered electrons through subjecting two oppositely-charged electric plates around the cathode ray.
He noticed that the particles where deflected by both the magnetic and electric fields.
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Which of the following situations violates the second law of
thermodynamics?
OA. A heat pump absorbs 100 J of heat from a cool reservoir and
releases 80 J of heat to a hot reservoir.
B. A heat engine absorbs 100 J of heat from a hot reservoir and
releases 70 J of heat to a cool reservoir.
C. A heat pump absorbs 100 J of heat from a cool reservoir and
releases 120 J of heat to a hot reservoir.
D. A heat engine absorbs 100 J of heat from a hot reservoir and
releases 20 J of heat to a cool reservoir.
C. A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.
What would violate the second law of thermodynamics?In order to operate, a heat engine must reject some of the heat it receives from the high-temperature source to a low-temperature sink.
A heat engine that violates the second law converts 100 percent of this heat to work. This is physically impossible. This heat engine violates the second law of thermodynamics.
The second law can also be stated as no heat engine can have a thermal efficiency of 100 percent.
The thermal efficiency of a heat engine is defined as the ratio of the work output to the heat input:
Clearly, if the thermal efficiency of a heat engine is 100 percent,
Qin=Wout
If the second law precludes a heat engine from having a thermal efficiency of 100 percent. A heat engine is a device that converts a portion of the heat supplied to it from a high-temperature source into work. The remaining heat is rejected to a low-temperature sink.
Therefore:
A heat pump absorbs 100 J of heat from a cool reservoir and releases 120 J of heat to a hot reservoir.
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