Answer:
One gram atom of any substance contains one Avogadro number of atoms. Therefore, the number of atoms of U-235 present in 235 g of the substance = Avogadro Number = 6.02×10^23 atoms
The number of U-235 atoms present in 1 g of the substance = (6.02×10^23/235) atoms=2.56×10^21 atoms
Energy released in one atom fissioning = 200 MeV= 200 MeV × 1.6 × 10^-6 erg/MeV= 3.2 ×10^-4 erg/atom.
Energy released in the fission of all the atoms contained in 1g of Uranium-235 fissioning = (2.56×10^21 atom)×(3.2×10^-4 erg/atom)=8.19 ×10^17 erg
Now
1 kWh = 1000 Watt hour = 1000×( 10^7 erg/s)×3600s = 3.6 ×10^13 erg/kWh
So energy in kWh released in fission of 1 g of U-235 = (8.19× 10^17 erg)÷(3.6×10^13 erg/kWh) = 2.55 ×10⁴ kWh.
Added on 19th February, 2019.
The energy consumption of an average home in India in a month is between 300–500 kWh in the metropolitan cities. Let us take it at 400 kWh. So one gram of nuclear fuel (uranium) would be able to meet the energy requirements of a town of about 6000 for a month.
The energy in a fissile material is highly concentrated, compared to other types of fuels like wood, coal, diesel etc. So nuclear powered submarines can remain below water for very long periods of time, as they do not need to surface for getting fuel.
Explanation:
Energy in kWh released in fission of 1 g of U-235 is 2.55 ×10⁴ kWh.
How do find the energy released in fission?One gram atom of any substance contains one Avogadro number of atoms. Therefore, the number of atoms of U-235 present in 235 g of the substance = Avogadro Number = 6.02×10^23 atoms
The number of U-235 atoms present in 1 g of the substance = (6.02×10^23/235) atoms=2.56×10^21 atoms
Energy released in one atom fissioning = 200 MeV= 200 MeV × 1.6 × [tex]10^{-6}[/tex] erg/MeV= 3.2 ×[tex]10^{-4}[/tex] erg/atom.
The energy released in the fission of all the atoms contained in 1g of Uranium-235 fissioning = (2.56×[tex]10^{21}[/tex] atom)×(3.2×[tex]10^{-4}[/tex] erg/atom) = 8.19 ×[tex]10^{17}[/tex] erg
1000 Watt hour = 1000×( [tex]10^{7}[/tex] erg/s)×3600s = 3.6 ×10^13 erg/kWh
So the energy in kWh released in fission of 1 g of U-235 = 2.55 ×10⁴ kWh.
Fission takes place when a neutron slams into a bigger atom, forcing it to excite and break up into smaller atoms—additionally referred to as fission products. Extra neutrons are also launched that may initiate a sequence reaction. whilst each atom splits, a high-quality amount of electricity is released.
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50kg sled is being pulled with 300N of force at 30 degrees, starting from rest they find they are moving at 5 m/s after traveling for 6 secs. whats is the coefficient of kentic friction
Answer:
I don't know to be honest
A cube of gold weighing 250g is heated from 25 degrees Celsius to some higher temperature, with the absorption of 430 Joules of heat energy. If the specific heat of gold is .03 J/g C, then what will the final temp of the gold cube be?
The final temp of the gold cube will be 30.773 °C. The heat absorption principle is used in the given problem.
What is specific heat capacity ?The amount of heat required to increase a substance's temperature by one degree Celsius is known as specific heat capacity.
Similarly, heat capacity is the relationship between the amount of energy delivered to a substance and the increase in temperature that results.
Mathematically, specific heat capacity is given by;
\rm Q= Ms \triangle t
Where,
Q is the amount of energy necessary to raise the temperature
M is the mass
Δt is the time it takes to raise the temperature.
s stands for specific heat capacity
While t stands for temperature change.
The given data in the problem is;
The energy required to raise the temperature is 430 joules.
M is the mass of gold = 250 g
s is the specific heat capacity of silver= (0.3 J/°Cg),
ΔT is the temperature fluctuation
The specific heat capacity is given by;
[tex]\rm Q= Ms \triangle t \\\\ \rm 430= 250 \times 0.3 \times (T_f-25)\\\\ T_f=30.773 ^0 C[/tex]
Hence,the final temp of the gold cube will be 30.773 °C.
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What force is applied to a 60 kg person if it takes 7.8 seconds to reach a speed of 12.86 m/s from rest?
Answer:
drag
Explanation:
drag is the force that acts against any moving object.
if it takes him any amount of time to get from one speed to another, it is caused by drag.
A positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field. What is the magnitude of the electric field at this location?
The magnitude of the electric field at the location, where a positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field is 0.25×10⁶ N/C.
What is electric field?The electric field is the field, which is surrounded by the electric charged. The electric field is the electric force per unit charge.
It can be given as,
[tex]E=Fq[/tex]
Here, F is the electric force and q is the charge.
A positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field. Put the values in the fomula,
[tex]E=\dfrac{F}{q}\\E=\dfrac{0.75}{3\times10^{-6}}\\[/tex]
[tex]E=0.25\times10^{6}\rm\; N/C[/tex]
Thus, the magnitude of the electric field at the location, where a positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field is 0.25×10⁶ N/C.
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Scientists infer that early North American humans hunted the mastodon. Carbon-14 dating of the rib bone indicates that 2.4 half-lives have passed since the mastodon was killed. Approximately how many years ago did the mastodon die?
I know the answers are online, but like I need somebody to explain how you get the answer.
The mastodon die approximately 13,700 years ago (the half-life of this isotope is 5,730 years).
What is Carbon-14 dating?Carbon-14 dating is the estimation of a period due to the decay in the amount of this radioactive isotope (C14).
This approach (Carbon-14 dating) is well known to estimate the age of different types of fossils, either plants or animals.
In conclusion, the mastodon die approximately 13,700 years ago (the half-life of this isotope is 5,730 years).
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The following are Aristotle’s beliefs about motion EXCEPT:
a. Objects move according to natural tendencies.
b. All motion on the Earth is linear.
c. Bodies dropped fall at the same time regardless of the mass.
d. To sustain motion of an object, a force needs to be applied continuously.
The statement which are Aristotle’s beliefs about motion EXCEPT option a.
What is Aristotle's theory of motion?Aristotle's theory of motion believed that all motion was centered upon the object trying to reach its natural resting position.
The theory states that it requires a force to make an object move in an unnatural" manner.
Until and unless a force is applied, the motion is continued or remains stopped.
Thus, all the statements are correct except Objects move according to natural tendencies.
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A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current? 0. 5 A 2 A 4 A 8 A.
If the resistance decreases to (1/4) of its original value while the voltage remained constant, the resulting current is 8A.
Option D) is the correct answer.
What is Ohm's Law?Ohm’s law states that "the potential difference between two points is directly proportional to the current flowing through the resistance.
It is expressed as;
V = I × R
Where V is the voltage or potential difference, potential difference, I is the current and R is the resistance.
Given that the circuit has a current of 2A, this means;
V = 2A × R
Next, the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant
V = I' × (1/4)R
So we can equate.
2A × R = I' × (1/4)R
2A × R = I' × R/4
2AR = I'R/4
8AR = I'R
I' = 8AR / R
I' = 8A
If the resistance decreases to (1/4) of its original value while the voltage remained constant, the resulting current is 8A.
Option D) is the correct answer.
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Carla draws two circuit diagrams that connect the same components in different ways, as shown. which statement about the circuits is correct? the total resistance in circuit a is greater than that in circuit b. when a bulb in circuit a goes out, the other bulbs keep shining. the bulbs in circuit a shine brighter than those in circuit b. when a bulb in circuit b goes out, the other bulbs go out.
Carla draws two circuit diagrams that connect the same components in different ways, as shown. The correct statement is "the total resistance in circuit a is greater than that in-circuit b.". Option A. This is further explained below.
What is a circuit?Generally, a circuit is simply defined as a fixed schedule of activities, but In terms of physical structure of a connection circuit is a visual description of a body of electrical connection and it help the practitioner ro better understand its subject and easily make connections.
In conclusion, Carla creates two circuit schematics, as illustrated, that link the same components in various ways. "The overall resistance in circuit an is larger than that in b," is the correct statement.
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Answer:
A
Explanation:
Edge 2022
The half-life of I-137 is 8.07 days. If 25 grams are left after 40.35 days, how many grams were in the original sample?
Answer:
40.35 da / 8.7 da/half-life = 5 half lives
The sample has gone thru 5 half lives
2^5 = 32 only 1/32 of the original amount is left
25 g * 32 = 800 g present in the original sample
An 80-g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow aver a distance of 80 cm.
What was the work done on the arrow?
What are your controls?
Answer:
A to jump
Explanation:
hope this helpes!
A parallel beam of light of wavelength 450nm is incident normally on a diffraction grating which has 300lines/mm what is the total number of intensity maxima observed?
The total number of intensity maxima observed is determined as 15.
Number of intensity maxima observedThe number of intensity maxima observed is calculated as follows;
[tex]n = \frac{1}{\lambda N}[/tex]
n = (1) / (450 x 10⁻⁹ x 300 x 10³)
n = 7.4
The total number of intensity maxima observed;
nt = 2n + 1
nt = 2(7) + 1
nt = 15
Thus, the total number of intensity maxima observed is determined as 15.
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Help please!! Thank you.
Answer:
I think the answer is C.
Explanation:
the verticale distance of a wave from its crest to its trough
The magnetic field around a current carrying wire forms concentric circles about the wire. True or False
Answer:
true
Explanation:
WHOEVER ANSWERS FIRST WILL GET BRAINLIEST!!!!
If the half-life of iodine-131 is 8 days, how old is a sample if only ¼ of the original amount remains? Write 2 - 3 sentences explaining your reasoning.
The half-life of a substance is the time the substance takes to decay until the amount of the sample is half of its initial amount.
In this problem, the half-life of iodine-131 is 8 days. This means that after 8 days, only half of the initial sample will be left. After another 8 days (16 days), the sample will be reduced by another factor 1/2, so only 1/4 of the initial sample will be left.
Since the initial sample was 0.96 g, after 16 days the amount of iodine left is m = 1(0.96g) = 0.24g
Answer:
24 days
Explanation:
This is because the half-life is eight days. If you add another half-life, which will be 16 days, 1/4 of the sample remains, and if you add another half-life which is 24 days, 1/8 will remain.
50gm of ice at -6⁰c is dropped into water at 0⁰c. How many grams of water freeze?
Who was Queen Himiko and why was she important?
Answer:
According to Japanese legend, Himiko was the daughter of the emperor Suinin (fl. 1st century bc–1st century ad), who gave her custody of the sacred mirror, symbol of the sun goddess. In 5 bc she supposedly enshrined the mirror at Ise, a city of present Mie Prefecture.
Part C
Set the opaque bowl on a table. Place a penny in the center of the bowl. Back away slowly from the table, and stop immediately when you can’t see the penny. Mark the spot on the floor where you are standing with a piece of tape. Look at the drawing below. It shows how light reflects off the bowl and the penny. (Note that the opaque container is transparent in the drawing so that we can see the path of light.) In which position, A or B, do you see the penny? In which position, A or B, do you not see the penny?
The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
What is a transparent object?A transparent object is one that can allow light to pass through it while an opaque object does not allow light to pass through it.
The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
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The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
Write any three advantages of classification of living beings ?
Answer:
Answer: The advantages of classifying organisms are as follows: (i) Classification facilitates the identification of organisms. (ii) helps to establish the relationship among various groups of organisms. (iii) helps to study the phylogeny and evolutionary history of organisms.
Explanation:
hope it will help you
HELPPP PLEASE NOBODY EVER HELPS ME
1. Events involving a disk-shaped nebula occurred before the nuclear fusion that led to the birth of the solar system. Which two statements about the disk-shaped nebula are true?
Gravity caused the disk-shaped nebula to shrink.
Gravity caused the nebula to flatten out in its disk-like shape.
Rotational motion caused the disk-shaped nebula to shrink.
Rotational motion caused the nebula to flatten out in its disk-like shape.
The flattening of the disk caused the speed of rotation to decrease.
2. Match each orbiting body to its attribute.
varies greatly in size from one to the next
has a characteristic glow
usually burns up if it enters Earth's atmosphere
primarily made of hydrogen and helium
Comet
Meteoroid
Gas giant
Asteroid
3. What are two reasons why the terrestrial planets formed closer to the Sun after the supernova event that initiated the formation of the solar system?
They are made of denser objects, which can condense at relatively high temperatures.
They contain lightweight materials that condense in areas of relatively low radiation.
They are made of heavier elements, which have a stronger gravitational attraction to the Sun.
They are relatively small in size, so the Sun’s gravity has a strong influence on them.
They have gaseous surfaces, which is ideal in those areas of high radiation near the Sun.
Answer:
1. Gravity caused the disk-shaped nebula to shrink.
Rotational motion caused the nebula to flatten out in its disk-like shape
2. Comet - has a characteristic glow
Meteoroid - usually burns up if it enters Earth's atmosphere
Gas giant - primarily made of hydrogen and helium
Asteroid - varies greatly in size from one to the next
3. They are made of denser objects, which can condense at relatively high temperatures
They are made of heavier elements, which have a stronger gravitational attraction to the Sun
Explanation:
These should be the correct answers. Hope this helped!
A stationary charge is located between the poles of a horseshoe magnet. Is a magnetic force excerted of the charge? why?
A stationary charge is located between the poles of a horseshoe magnet. The magnetic force exerted by the charge is zero.
What is charge?Charge is the physical property of matter which cause a particle to attract or repel when placed in its field.
A stationary charged particle does not interact with a static magnetic field. A charge placed in a magnetic field experiences a magnetic force. There will be no magnetic force acting on a stationary charge. The charge must be moving in order to have magnetic force on it.
Thus, the magnetic force exerted by the charge is zero.
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NEED TODAY
Two projectiles are thrown in the air with the same initial speed. one was launched at 20° while the other was launched at 70°. Both projectiles landed at the same point. Did they stay in the air for the same amount of time ?
Answer:
No, projectile launched at 20° landed first.
Explanation:
70° projectile had a vertical velocity of v*sin(70), which is significantly bigger than v*sin(20). Since v=vx+at, we can see that [tex]Vyi*sin(20)-gt < Vyi*sin(70)-gt[/tex]
solve for t, you can check that by substituting velocity for any number.
Answer:
well,they may or they may not. It all depends on the vertical components of the speed with which the projectile is thrown.
Explanation:
to derive the time of flight :
Considering the vertical motion (along y axis) , the journey from the ground to highest point
v=u+at ,where v=final velocity , u=initial velocity , acceleration due to gravity i.e g and t is the time taken by the particle to reach the highest point
o=u(sin theta) + (- g)t
t=u(sin theta) - g
Hence total time of flight is twice of that i.e
T=2(vertical components of speed) / g
So, if two projectile have some vertical components of velocity , they will have equal time of flight.
Which substance in the air of U.S. cities has decreased least since the Clean Air Act began?
A. carbon monoxide
B. ground-level ozone
C. particulate matter
D. sulfur dioxide
Answer: the answer is carbon monoxide
Explanation:
hope this helps :)
The chemical reaction in Plants happens when... *
O Roots absorb water
O Roots absorb soil nutrients
O Sunlight is turned to food
O Carbon Dioxide is turned to Oxygen
Answer:
carbon dioxide is turned to oxygen
Explanation:
because carbon and oxygen are bonded together to form a molecule therefore in order to separate them a chemical reaction would be required
How would you predict the speeds that a coaster car will reach before it’s ever placed on the track?
It is possible to predict the speed that a coaster will reach before it is ever placed on the track by using the conservation of energy principle.
What is energy of conservation principle?The principle of energy conservation states that energy can neither be created nor destroyed. It may transform from one form to another form.
Just like in roller coaster, velocity at the maximum height is predicted by using this principle. At the maximum height, potential energy is maximum and kinetic energy is minimum.
Thus, It is possible to predict the speed that a coaster will reach before it is ever placed on the track by using the conservation of energy principle.
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Explain how the water in the puddle forms part of the water cycle?
Answer:
The water makes a cloud when the warm moist air meets the colder air. This demonstrates the formation of what we know as "clouds". Then precipitation happens when the clouds gets to full of water droplets. Finally, accumulation happens when the water forms puddles and goes back to the lakes and streams.
Electric current can be produced in a wire by simply moving a ________________ into or out of a wire coil.
magnet
stick
battery
uranium
Electric current can be produced in a wire by simply moving a magnet into or out of a wire coil. Option A is correct.
What is the Faraday law of electromagnetic induction?According to Faraday's law of electromagnetic induction, the rate of change of magnetic flux link with the coil is responsible for generating emf in the coil to result in the flow of amount of current .
The phenomenon of inducing voltage by changing the magnetic field around a conductor will be Electromagnetic Induction.
So in order to increase the current, we need to increase the EMF;
so we can increase it by;
1) Increasing the number of turns
2) Increase the area of the loop
3) By moving the magnet faster
Hence, option A is correct.
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What do astronomers use in addition to parallax to find the actual distance of stars that are close to Earth?
Question 15 options:
ellipse
pariapsis
gravity
trigonometry
Answer:
trigonometry (guessing)
Explanation:
ellipse: is the shape of an orbit : looks like an oval
periapsis : shortest distance between something like the moon and the planet its orbiting around like the earth
parallax is triangulation. like how gps works. looking at a star one day and then looking at it again 6 months later, an astronomer can see a difference in the viewing angle for the star. With trigonometry, the different angles yield a distance. This technique works for stars within about 400 light years of earth
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By comparing the intrinsic brightness to the star's apparent brightness we can calculate the distance of stars
1/r^2 rule states that the apparent brightness of a light source is proportional to the square of its distance.Jan 11, 2022
https://www.space.com/30417-parallax.html
alternative distance measurement for stars used by most astronomers is the parsec. A star with a parallax angle of 1 arcsecond has a distance of 1 parsec, or 1 parsec per arcsecond of parallax, which is about 3.26 light years
blossoms.mit.edu
.
If a car drives 10 miles NE and then due East for 10 minutes traveling 8
miles. What is the car's distance traveled?
O 28 miles
O O miles
O 18 miles
O 12.8 miles
Answer:
12.8 milesExplanation:
[tex]d=\sqrt{a^{2}+b^{2} } \\where;\\a=10\\b=8[/tex]
What positive impact can animals have on the environment?
(A They eat fruit
(B They eat insects
(C They pollinate flowers
(D They spread disease
Answer:
maybe C they pollinate flowers
Explanation:
because when you search you will see pollination
