100.0 grams of an isotope with a half-life of 36.0
hours is present at time zero. How much time will
have elapsed when 5.00 grams remains?
Answer:
155.6 hrs
Explanation:
5 = 100 (1/2)^n n = 4.32 half lives
4.32 * 36 = 155.6 hrs
The required, 155.58 hours will have elapsed when 5.00 grams of the isotope remains.
What is the half-life of the element?The half-life of the element is defined as the time span in which the element grows or decays half of its whole composition of growth and decay.
Here,
The decay of a radioactive substance can be modeled by the following equation,
[tex]N(t) = N_o (1/2)^{t/T}[/tex]
where N₀ is the initial quantity of the substance, N(t) is the quantity remaining after time t has elapsed, and T is the half-life of the substance.
In this problem, we are given,
N₀ = 100.0 g
N(t) = 5.00 g
T = 36.0 hours
We want to find the time t that has elapsed. Rearranging the equation above, we can solve for t,
t = T (log N₀ - log N(t)) / log 2
Substituting the given values, we get,
t = 36.0 hours x (log 100.0 - log 5.00 ) / log 2
t = 36.0 hours x 4.643 / 0.693
t = 155.58 hours
Therefore, approximately 155.58 hours will have elapsed when 5.00 grams of the isotope remains.
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What do Jupiter, Neptune, and Saturn have in common?
Answer:
There are not close to the sun, outer planets, and have rings
Explanation:
Glass does not transmit ultraviolet radiation. Suggest what happens to ultraviolet radiation when it is incident on glass. (1 mark)
Answer:
Most of UV radiation is stopped by glass & this is why you will not get sunburns behind a glass. The glass simply filters out the UV radiation that is responsible for the sunburns & protect your skins from these energetic & somewhat harmful radiation
Explanation:
Because sound waves vibrate longitudinally, what can result?
A Disruptions of fixed waves
B. Changes in the density of air
С. Pressure differences where compressions are rarefied
D Regions of high pressure and low pressure
I NEED HELP ASAPPP!!!!!!!! someone help me!!! :(
Is there effect of friction on mechanical advantange
Answer:
Most certainly yes
Explanation: First you have to define what friction is "A force that resist motion" while Mechanical advantage " is simply a measure of the output force to the input force". Hence in a mechanical system if you increase friction in the system, it reduces the mechanical advantage and vice versa.
Water flows through a pipe of diameter 8.00 cm at 45.0 m/min. Find the flow rate (a) in m3 /min and (b) in L/s.
The flow rates of water through the pipe illustrates how the water flows through the pipe, and the flow rates are (a) 0.23 m³/min and (b) 3.77 L/s
The flow rate of water in m³/minThe given parameters are:
Diameter, d = 8.00 cmVelocity, v = 45.0 m/minExpress the unit of the diameter as meters (m)
d = 8.00 * 0.01 m
d = 0.08 m
The area is then calculated using:
A = π(d/2)²
So, we have:
A = 3.14 * (0.08/2)²
Evaluate
A = 0.005024 m²
The flow rate (Q) is then calculated using:
Q = A * v
This gives
Q = 0.005024 m² * 45.0 m/min
Evaluate
Q = 0.22608 m³/min
Approximate
Q = 0.23 m³/min
Hence, the water flow rate is 0.23 m³/min
The flow rate of water in L/sIn (a), we have:
Q = 0.22608 m³/min
Convert minutes to seconds
Q = 0.22608 m³/(60 s)
Divide
Q = 0.003768 m³/s
Convert m³ to L
Q = 0.003768 * 1000 L/s
Evaluate the product
Q = 3.768 L/s
Approximate
Q = 3.77 L/s
Hence, the water flow rate is 3.77 L/s
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An illuminated object is 20 cm from the center of a convex lens. A focused image is formed on a screen 100 cm from the lens. What is the focal length of the lens?
The focal length of the conves lense with image distance of 100cm and object distance of 20cm is f = 10cm
Convex LenseGiven Data
Object Distance u = 20 cmImage Distance v = 100 cmWe know that the expression for calculating the Focal lenght is given as
F = (uv)/(u + v) cm
Substittuting the Given Parameter into the expression we have
F = 20*100/20+100
F = 1200/120
F = 10 cm
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UV radiation with a 200 nm wavelength shines on a gold electrode in a photoelectric cell. What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
For a UV radiation with a 200 nm wavelength is mathematically given as the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
K.E=1.779*10^{19}J
K.E=1.112ev
What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold?
Generally, the equation for the photo electric equation is mathematically given as
[tex]hc/\lambda=K.E+\phi[/tex]
Therefore
K.E=(6.626*10^{-34}*3*10^8/2*10^{-7})-5.1*1.6*10^{-19}
K.E=1.779*10^{19}J
In conclusion, in eV, of photoelectrons ejected from the gold
K.E=1.112ev
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Due to the cylindrical symmetry of this problem, the induced electric field E⃗ (R,t) can depend only on the distance R from the z axis, where R is restricted to the region outside the iron rod. Find this field. Express E⃗ (R,t) in terms of quantities given in the introduction (and constants), using the unit vectors in the cylindrical coordinate system, θ^, r^, and k^
It is to be noted that the electric field that has been induced is (-B₁ A/2[tex]\pi[/tex]R)θ. This is obtained by using the vector units in the Cylindrical Coordinate System.
What are Cylindrical Coordinates?Cylindrical Coordinates are simply defined as a component of a coordinate system that is used to locate a location in space using its polar coordinates and vertical distance from the polar plane.
How is the induced field arrived at?The formula for Induced Electric Field is given as:
∫ E · dl = ∈
If we replace ∈ with -B₁A and 2[tex]\pi[/tex]R for dl then
∫ E · dl = -B₁A. Thus, we can state that
E∫ dl = -B₁A
Replacing or substituting 2[tex]\pi[/tex]R for ∫ dl ·E(2πR) = - B₁A
We can thus rearrange the equation to read:
E · E = ([tex]\frac{-B1A}{2\pi R}[/tex])θ
It is to be noted that the circumference of a circle is the integral of the length of the element. While θ, which in this case is the unit vector refers to the Cylindrical Coordinate and the direction of the electric field.
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The force between two charged objects is equal to 400 N. What will be the force between the two objects if the charge on both objects is doubled?
The electrical force between 2 objects is 400 N. According to Coulomb's law, if both charges are doubled, the electrical force will be 1600 N.
What does Coulomb's law state?The electrical force between 2 charged objects is directly proportional to their charges and inversely proportional to the square of the distance between them.
The electrical force between 2 objects is 400 N. Due to the direct proportionality, if the charge of both objects is doubled (multiplied by 2), the total force will be multiplied by 4.
F = 2 × 2 × 400 N = 1600 N
The electrical force between 2 objects is 400 N. According to Coulomb's law, if both charges are doubled, the electrical force will be 1600 N.
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Force = 700 N , Pressure = 10 Pascal
Area = ?
Answer :-
Force is 70 meter² .Explanation :-
As per the provided information in the given question, Force is given as 700 Newton. Pressure is given as 10 Pascal. And, we have been asked to calculate the Area.
For calculating the Area , we will use the Formula :-
[tex] \bigstar \: \: \: \boxed {\sf { \: Area \: = \: \dfrac {Force}{Pressure \: } }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \Longrightarrow \: \: \: \sf {Area \: = \: \dfrac {Force}{Pressure}} [/tex]
[tex] \Longrightarrow \: \: \: \sf {Area \: = \: \dfrac {700}{10}} [/tex]
[tex] \Longrightarrow \: \: \: \bf {Area \: = \: 70} [/tex]
Hence :-
Area = 70 meter² .[tex] \underline {\rule {180pt}{4pt}} [/tex]
true or false. Revolution is the movement of Earth around the sun.
This is science
Answer:
True
Explanation:
REVOLUTION is the time it takes to REVOLVE around the sun
ROTATION is the arth spinning on its axis every 24 hrs to make a day
What was the main reason for the Maoist uprising in Nepal?
Answer:
For overthrowing the Nepalese monarchy and establishing people's republic
Which object had more potential energy when it was lifted to a distance of 1000 centimeters? Show your calculation.
PLEASE HELP IM OFFERING *15 POINTS*
Explanation:
We Know That
POTENTIAL ENERGY= MASS*g*HEIGHT
When the objects are lifted to same height then the object with heavier mass would have the highest potential energy
.
Which type of volcano forms when lava comes up out of the ground for a long period of time?.
Answer: Shield Volcanoes
Explanation:
are huge, gently sloping volcanoes built of very thin lava spreading out in all directions from a central vent
When looking at a velocity vs. time graph, the ___ is equal to the displacement .
Answer:
area bound by the line and the axes???
Explanation:
Which is a type of electromagnetic wave? A. Sound wave B. Wave in a spring C. Ocean wave D. infrared wave
Answer:
D. infared waveExplanation:
The electromagnetic spectrum consists of :
Radio wavesMicro wavesInfared wavesVisible light wavesUV raysX-raysGamma raysExplain how a schematic of an electric circuit compares to an artist's drawing of the same circuit
The schematic of an electric circuit is clear and standardized while the artist drawing depicts a higher level of the features.
What is a Circuit?This can be defined as a path along which the whole current flows through each component.
The schematic shows the connections and components in an electrical circuit and how they are connected while the artist drawing shows how the features mentioned together with how they are arranged.
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The formation of fossil fuels is a process that takes millions of years and starts with energy from the Sun. The Sun contributes to the formation of fossil fuels by –
Answer:
Photosynthesis
Explanation:
It is captured through photosynthesis and that helps the formation of fossil fuels.
I hope it helps! Have a great day!
Anygays-
The formation of fossil fuels is a process that takes millions of years and starts with energy from the sun, and the sun contributes to the formation of fossil fuels by providing sunlight so that microbes can convert it into coal and other organic matters.
What role does the sun play in fossil fuels?The sun does play a role in the formation of fossil fuels, such as coal, oil, and natural gas, and the decay of organic matter, such as dead plants and animals, accumulates over millions of years and apart from that, solar energy is captured by plants through the process of photosynthesis, which converts sunlight into energy that the plant can use to grow.
Hence, the sun contributes to the formation of fossil fuels by providing sunlight so that microbes can convert it into coal and other organic materials, which can be further used.
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Which best describes what occurs when an object takes in a wave as the wave hits it?.
Answer:
Absorption
Explanation:
An fm radio station broadcasts at a frequency of 101. 3 mhz. What is the wavelength?.
Answer:
2.96 m
Explanation:
Thus, the wavelength of the radio waves emitted by the FM broadcast station is 2.96 m
For a fixed amount of gas at a fixed temperature, what will happen if the volume is doubled?.
Answer:
the pressure will decrease by 1/2
Explanation:
PV=nRT
P=(nRT)/(V)
nRT are all constant so they will equal 1
V is 2
P=1/2
PHYSICS GIVING LOTS OF POINTS!!! 100
The number of protons in the nucleus of an atom determines the species of the atom, i.e., the element to which the atom belongs. An atom has the same number of protons and neutrons. But the electron number cannot be used instead because
electrons are not within the nucleus
electrons are negatively charged
electrons can be removed from or added to an atom
electrons are lighter than protons
Answer:
electrons can be removed or added creating ions of the element
Explanation:
can we see a halo around the half moon?
Answer:
No we cannot
Explanation:
But what causes a ring to appear around the moon? This phenomenon is called a "moon halo." According to the National Weather Service, this ring of light, which is actually an optical illusion, forms around the moon when moonlight refracts off ice crystals in cirrus clouds, high up in the Earth's atmosphere.
Most of the mass of the milky way exists in the form of.
Answer: Dark matter.
Explanation: Hope it helps :)
True or False: If you cut a bar magnet in half, you will get a magnet that is only a north pole and a magnet that is only a south pole.
Answer: False
Explanation:
That is false. This is implying the existence of magnetic monopoles, which we do not know exist. As far as we know, magnetic monopoles don't exist and its impossible to create one. Due to Maxwell's equations, it implies that a magnetic monopole should exist, but we have not yet found one.
Describe each step of mitosis
Answer:
prophase, prometaphase, metaphase, anaphase, and telophase
Explanation:
The main difficulty with multiple star systems such as Alpha Centauri as places to look for life is that: _________
Answer:
The conditions for life are extremely specific and the search is extremely broad.
Explanation:
in order to sustain life, the planet has to have water.
Too hot and the water will evaporate too cold and the water will freeze, this is based on the planet's distance from the sun and its solar mass. (The mass compared to our sun) If the solar mass is double that of our sun then the planet would have to be double the distance from the sun in order to sustain life and keep the water from evaporating. Let me Know if This helps
Efficiency of a machine is always less than 100% why?
The reason the efficiency is always less than 100% is because there is always some sort of friction in the machine.
Answer: because of friction
How did astronomers’ understanding of planets shift by the 16th century?
A.
Previously, planets were thought to rotate around Earth, and then astronomers realized planets actually orbited around the Sun.
B.
Previously, planets were thought to orbit the Sun with their moons, and then astronomers realized moons orbited planets, not the Sun.
C.
Previously, planets were thought to orbit in elliptical shapes only, and then astronomers realized they could also orbit circularly.
D.
Previously, planets were thought to orbit black holes, and then astronomers realized that planets orbit their moons.
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct choice is A
Before 16th century, people thought that sun revolves around earth. but soon after that time period Astronomers realized that actually planets orbited around the sun.
Answer:
The Correct choice is A
Before 16th century, people thought that sun revolves around earth. but soon after that time period Astronomers realized that actually planets orbited around the sun.