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.
As a minimum requirement, a boat that is less than 26 feet in length with an installed fuel tank must have what type of fire extinguisher onboard?.
As a minimum requirement, a boat that is less than 26 feet in length with an installed fuel tank must have 5-B fire extinguisher.
What is fire extinguisher?
A fire extinguisher is a fire protection device used to terminate or control small fires, often in emergency situations.
Minimum requirement for fire extinguisher in boatsIf your boat is less than 26 feet, you need one 5-B fire extinguisher on board.
Thus, as a minimum requirement, a boat that is less than 26 feet in length with an installed fuel tank must have 5-B fire extinguisher.
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Having a good range of motion is super important because that is what allows you to ________________.
A.
do different activities
B.
run farther
C.
lose more weight
D.
balance
A string with a natural frequency of 15 Hz will likely show
resonance at which frequencies: (could be more than one)
A) 20 Hz; B) 30 Hz; C) 40 Hz; D) 50 Hz; E) 60 Hz
What other frequencies would show resonance?
Frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.
What is resonance frequency?Mechanical systems and charged particles all have a frequency that they vibrate at. this frequency is referred to as the resonance frequency or natural frequency.
When the matching vibrations of another item enhance the amplitude of an object's oscillations, this is known as resonance.
15 Hz is the fundamental frequency of the string.
Higher frequencies, such as the first overtone, second overtone, third overtone, and so on, must be used to cause the string to vibrate in a resonant manner.
F₁ = 2F₀ = 2 x 15 = 30 Hz is the initial overtone.
F₂ = 3F₀ = 3 x 15 = 45 Hz is the second overtone.
F₃ = 4F₀ = 4 × 15 = 60 Hz is the third overtone.
Hence,frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.
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Subject- Science 6th grade
please help with hw. Thank you!
Answer:
Option c: wind and clouds
Aurora binge drinks. what does this most likely mean for aurora? a she drinks enough alcohol to become intoxicated. b she only drinks at social occasions. c she drinks one or two drinks every night. d she avoids alcohol altogether.
The most likely mean for aurora. She drinks one or two drinks every night. Option C is correct.
What is Binge-drinking?Binge-drinking is explained as having five or more drinks in one sitting for males, and four or more drinks in one sitting for women.
The majority of people who binge-drink do not have a serious alcohol problem. Binge-drinking, on the other hand, is a dangerous risk behavior linked to significant injuries and a variety of disorders.
Hence, option C is correct.
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What is the magnitude of the electric field at the dot in the figure? (figure 1)
The magnitude of the electric field at the dot is : 10⁴ v/m
What is electric field?
Electric field is a region around a charged particle or object within which a force would be exerted on other charged particles or objects.
Given that there are three equipotential lines with equal spacing,we will apply the the relationship between P.D and electric field
Determine the magnitude of the electric field at the dot
change in voltage = E .d
[tex]100 - 0 = E \times ( 1 \times 10^{-2}\ m ) ----- ( 1 )[/tex]
From equation ( 1 )
The magnitude of electric field will be given as
[tex]E = \dfrac{100 }{ ( 1 \times 10^{-2})\ }[/tex]
[tex]E = 10^4\ \ \frac {v}{ m}[/tex]
Hence we can conclude that The magnitude of the electric field at the dot is : 10⁴ v/m
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Help please i need to submit it noww
[tex]\text{Given that,}\\\\m_1 = m_2= 15~ kg\\\\r = 35~ m \\\\G = 6.67 \times 10^{-19} Nm^2 kg^{-2}\\\\\text{Gravitational force,}\\\\F_g = \dfrac{Gm_1 m_2} {r^2 }\\\\\\~~~~=\dfrac{6.67 \times 10^{-19} \times 15 \times 15}{35^2}\\\\\\~~~~=1.2252 \times 10^{-19}~N[/tex]
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Sorry but I can't help you cuz the words you use makes no sens if you are going to ask a question pls do and dont joke around about it thank you very much and have a great day! ^^
What ions rush into a neuron during depolarization.
Answer:
Sodium ions
Explanation:
Please click crown below my answer.
Which of the following is an appropriate explanation for why thermal energy is a combination of the kinetic and potential energies of the molecules in a sample of matter?
a. Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much energy is stored in their electric fields (potential energy)
b. Thermal Energy is based on how much room the particles have to collide (kinetic energy) and how much energy they gain from those collisions (potential energy)
c. Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much freedom they have to move further (potential energy)
d. Thermal Energy is based on how tightly contained the particles are (kinetic energy) and how loose their electron structure is (potential energy)
The appropriate explanation for why thermal energy is a combination of the kinetic and potential energies is Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much energy is stored in their electric fields (potential energy)
What is thermal energy?Thermal energy refer to the heat energy generated from an object or particle when there is increase on temperature whose internal energy is in equilibrium
Potential energy is the energy stored in a body at rest.
Kinetic energy is the energy at work in a body in motion.
Therefore, The appropriate explanation for why thermal energy is a combination of the kinetic and potential energies is Thermal Energy is based on how quickly the particles are moving (kinetic energy) and how much energy is stored in their electric fields (potential energy)
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Why does Mars provide the best opportunity for habitation by humans?
Answer:
Mars is an opportunity for humans to carry forward the light of consciousness, plus it is the closest planet like earth, it has land humans can land on and although its small, theres still water
Find the equivalent resistance of this circuit.
[tex]\huge{\boxed{\mathcal{♔︎Answer♔︎}}}[/tex]
200Ω
Explanation:
⠀
⠀
⠀⠀⠀⠀❖ Note
⠀
What is resistance?
Resistance is the opposition offered by the electric current.
⠀
What is electric current?
An electric current is the stream of flowing charge moving around a circuit.
⠀
⠀
⠀⠀⠀⠀■ Solution
⠀
[tex] \textsf{ As here, we can see in the above diagram} \\ \\ \sf R_1 \: and \: R_2 \: both \: are \: in \: series. \\ \\ \textsf{ So their total resistance will be} \: R_s[/tex]
So for formula for series will be
[tex] \sf R_s = R_1 + R_2 \\ \\ \sf R_s = 100 + 200 \\ \\ \boxed {R_s = 300Ω}[/tex]
⠀
[tex] \sf As \: you \: can \: also \: see \: here , \\ \\ \sf R_s \: is parallel \: with \: R_3 \\ \\ \sf So \: their \: total \: resistance \: R \: will \: be[/tex]
⠀
[tex] \sf \frac{1}{R } = \frac{1}{R_3} + \frac{1}{R_s } \\ \\ \sf \frac{1}{R} = \frac{1}{600} + \frac{1}{300} \\ \\ \sf \frac{1}{R} = \frac{1 + 2}{600} \\ \\ \sf \frac{1}{R} = \frac{ \cancel3}{ \cancel{600} \: \: \small{200}} \\ \\ \sf \frac{1}{R} = \frac{1}{200} \\ \\ \boxed{ \tt{R = 200Ω}} [/tex]
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⠀
So the total resistance will be 200Ω.
two cats are sitting on a 30 m hill. one cat has a mass of 4 kg and the other 6 kg. which cat has greater potential energy
Answer:
The 6 kg cat.
Explanation:
The six killogram cat because accelaratoin due to gravity is more for havy objects then smaller objects. (or lighter I suppose) ;)
Answer:
the cat with a mass of 6 kg
Explanation:
Potential Energy : Weight x Height
PE of cat w/ mass 4 kg :
PE = 4 x 10 x 30PE = 40 x 30PE = 1200 JPE of cat w/ mass 6 kg :
PE = 6 x 10 x 30PE = 60 x 30PE = 1800 JClearly, the cat with a mass of 6 kg has greater potential energy.
help me please.....●_●
Answer:
mg i would say an atomic number of 12 the um i would say stands for micrometer
Explanation:
What do people mean when they say "dropping of the face of the planet"? Is that even possible?
Answer:
Explanation:
Remark
Don't read it literally. It does not mean that you are on earth's surface one moment and the next your floating somewhere on the edge of the milky way.
It means that before the remark was made, you were outgoing and friendly. Something happened that caused you to withdraw from society and become somewhat like a hermit.
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
False
Explanation:
Solid water (ice) has a lesser density than liquid water. Hence, the statement is false.
Answer:
False
Explanation:
Let's know the relationship
Density=Mass/VolumeDensity is indirectly proportional to volume
If volume is less density is more and if volume is more density is less.
But Density also depends on temperature
Higher the temperature higher the density.
Liquid stage of water has higher temperature than solid .Liquid has higher density than solid .
A circular loop has a radius of .3 meters a magnetic field has an initial strength of 2 tesla directed out of the page. over the course of 5 seconds the magnetic field is changed to 3 tesla directed out of the page calculate the induced voltage in the loop
Hi there!
We can use Faraday's Law to solve:
[tex]\epsilon = N\frac{d\Phi _B}{dt}[/tex]
ε = Induced emf (? V)
N = Number of loops (1 loop)
ΦB = Magnetic flux (Wb)
We know that:
[tex]\Phi_B = \oint B \cdot dA = B\cdot A[/tex]
Since the area of the loop remains the same, we can take this out of the time derivative.
We get:
[tex]\frac{d\Phi_B}{dt} = A * \frac{dB}{dt}[/tex]
Also, since N = 1, we can now rewrite the equation for the induced emf as:
[tex]\epsilon = A * \frac{dB}{dt}[/tex]
dB/dt is equivalent to the change in the magnetic field with respect to time:
[tex]\Delta B = \frac{B_f - B_i}{\Delta t}\\\\\Delta B = \frac{3 - 2}{5} = 0.2 \frac{T}{s}[/tex]
Now, substitute this value into the equation for induced emf:
[tex]\epsilon = \pi (0.3^2) * (0.2) = \boxed{0.0565 V}[/tex]
**Also, since the magnetic field INCREASED out of the page, this change in magnetic flux will create an induced CLOCKWISE current that produces a magnetic field into the page in order to oppose the increase in magnetic flux OUT of the page.
our sun is a star that is fueled by a specific type of nuclear reaction. which type of nuclear reaction is this?
Answer:
the fusion of hydrogen nuclei or in other words "nuclear fusion"
Explanation:
HELP I'LL GIVE BRAINLIEST!!! A mosquito flaps its wings 800 times per second, which produces the annoying 800 Hz buzz. How far does the sound travel between wing beats? The speed of sound in air is 340 m/s. Answer in units of m. :)
Answer:
Explanation:
The distance traveled by the sound wave between the beats of mosquito flapping its wing is its wavelength. Since it is defined as the distance traveled by a periodic disturbance that propagates in a cycle, it is shown as:
λ = v/f
λ=340m/800Hz = 0.425m.
Pretty sure this is the answer, hope this helps!
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
4.2 into the atmosphere
Explanation:
Carbon movement into atmosphere :
(8.3 ± 0.4) + (1.0 ± 0.5)Let's avoid the variability 8.3 + 1.09.3Carbon movement in the sinks :
(2.6 ± 0.9) + (2.5 ± 0.5)2.6 + 2.55.1Net Carbon Movement :
9.3 - 5.14.2 into the atmosphere2. Sound waves moves down a hall past an open doorway. Waves of which wavelength would have the hardest time diffracting through the doorway
A 5 centimeters
B.2 meters
C. 100 meters
D. All of the above would easily diffract
Sound waves go along a corridor, past an open doorway. All the waves will have the most difficulty diffracting through the doorway. Option D is correct.
What is diffraction?Diffraction refers to a variety of events that occur when a wave collides with a barrier or an opening.
Diffraction is described as the bending of waves around the corners of an obstruction or through an aperture into the region of the obstacle's geometrical aperture's shadow.
The one with the longer wavelength will readily diffract. As a result, the one with a wavelength of 100 m can diffract readily.
Sound waves have a wavelength of 16.6 ×10⁻³ to 16.6 m in comparison to other waves. Which are audible to them, allowing them to diffract readily.
Sound waves go along a corridor, past an open doorway. All the waves will have the most difficulty diffracting through the doorway.
Hence,option D is correct.
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What are the criterions that need for mechanical work?
Mechanical work is the work done by a force on a mechanical body like machines .
When some mechanical force is applied on the machine the machine does some work which is mechanical work
It's a scaler quantity and have units as Joules(J)
The main criterion is mechanical energy,Force , Displacement (Not mandatory)
100 POINTS
Plutonium-235
Given: energy released = about 200 MeV per individual reaction (mass = 239 amu)
Part A
List the balanced nuclear reaction.
I NEED THIS ASAP
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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What is the hubble classification for a spiral galaxy with a small nuclear bulge and wide loosely wound spiral arms?.
Hubble classification for a spiral galaxy with a small nuclear bulge and wide loosely wound spiral arms is a, b and c.
What is the galaxy?Galaxy is the collection of stars, interstellar gases, dust and stone in the large space of universe.
Hubble classified these galaxies by referring them as SB galaxies with subclasses a, b, and c. They are just like the normal spirals. The spiral arms in barred spirals don't actually but appear to originate at the ends of the bar.
Hence, Hubble classification for a spiral galaxy with a small nuclear bulge and wide loosely wound spiral arms is a, b and c.
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what is the name of the units that we measure force in
Answer:
Newton (N)
Explanation:
Newtons are used to measure force.
hydraulic lift has an input cylinder 4cm indiameter and an out put cylinder 16cm in
diameter.find the force exerted by the out put pistion when aforce aforce Newton if applied to the input pistion
The force exerted by the output piston will be 20 N. The pressure exerted on the both end is equal.
What is pressure?The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.
It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.
The area of the input cylinder is found as;
A₁=πR₁²
A₁=π(2)²
A₂=4π
The area of the output cylinder is found as;
A₂=πR₂²
A₂=π(4)²
A₁=16π
The pressure exerted on the both end is equal ;]
P₁=P₂
F₁A₁=F₂A₂
80 ×4 π==F₂×16 π
F₂=20 N.
Hence,the force exerted by the output piston will be 20 N.
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What's the difference between an electrician and an electrical engineer
The difference between an electrician and an electrical engineer is the way of working towards a common electrical project.
What is an engineer?An engineer is a person who performs a function like designing, building, or maintaining engines, machines, or structures.
Electrical engineers and electricians both commonly involved in the process of creating and installing critical electrical systems.
An electrical engineer can design electronics and is familiar with the working of electrical parts.
An electrician is much more like a builder. They take the designs from electrical engineer and follow them to create, repair, or revise actual electrical systems.
Thus, the difference between an electrician and an electrical engineer is the way of working towards a common electrical project.
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physics 9
physics geniuses where r u need help!!!
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pls also check other questions!
A transformer uses 91 V supply to operate 13 V device, then the current in the primary coil is 0.27A.
What is transformer?A transformer is an electrical device which is involved in transferring electric energy from one AC circuit to another, either stepping up or down.
As, from the ohm's law, voltage is directly proportional to the current flowing through the coil.
I₂ / I₁ = V₂ / V₁
The current from the transformer I₁ is 1.9A, the voltage supply V₁ = 91V and the voltage to operate is 13 V, then the current through the primary coil is
I₂ = (91 / 13 ) x 1.9
I₂ = 0.27A
Thus, the current from the primary coil is 0.27A.
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What the name for the phenomenon of inducing voltage by changing the magnetic field around a conductor?
Electromagic
Electromagnetic Induction
Electrostatics
Van de Graaff generation
The phenomenon of inducing voltage by changing the magnetic field around a conductor will be Electromagnetic Induction. Option B 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 .
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 B is correct.
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which of the following do plants need for photosynthesis?
Answer:
They need carbon, sunlight and water.
Explanation:
