Answer:
2020 days
Explanation:
The half life equation is:
A = A₀ (½)^(t / T)
where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.
Here, A = 1.25 mg, A₀ = 2.50 mg, and T = 2020 days.
1.25 = 2.50 (½)^(t / 2020)
0.5 = ½^(t / 2020)
1 = t / 2020
t = 2020
It takes 2020 days.
The time required before a 2.50-mg sample of 146 61 pm is reduced to 1.25mg is 2020 days.
Half life is the time taken by a radioactive material for the radioactivity of to reduce by half its original value.
The half life equation is:
A = A₀ (½)^(t / T)
where A is the final amount, A₀ is the initial amount, t is the amount of time, and T is the half life.
Given is the value of A = 1.25 mg, A₀ = 2.50 mg, and T = 2020 days.
1.25 = 2.50 (½)^(t / 2020)
0.5 = ½^(t / 2020)
1 = t / 2020
t = 2020
Thus, time taken is 2020 days.
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If a turtle walks at a constant speed of 0.23 m/s, how long will it take to cover a distance of 65 meters?
Time = (distance) / (speed)
Time = (65 meters) / (0.23 m /s)
Time = (65 / 0.23) sec
Time = 282.6 seconds ( that's 4 minutes 42.6 seconds)
The time it would take a turtle moving with a speed of 0.23 m/s to cover a distance of 65 meters is approximately 282.61 seconds.
Explanation:The subject of this question is physics, specifically the concept of speed, distance, and time. The formula that relates these three quantities is speed = distance/time.
In this case, we are asked to calculate the time it would take for a turtle moving with a constant speed to cover a certain distance. Here, the given speed (0.23 m/s) of the turtle and the distance it needs to cover (65 meters) are known.
By rearranging the formula to solve for time, we get time = distance / speed. Plugging in the values, we get time = 65 meters / 0.23 m/s. Doing the math gives approximately 282.61 seconds. Thus, it would take the turtle around 283 seconds to cover the distance of 65 meters at a speed of 0.23 m/s.
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Countries establish internal economic zones in order to
have fewer economic restrictions
Explanation:
Answer:
have fewer economic restriction
Explanation:
just took quiz
Classify the items based on whether they are or are not matter.
toothpaste
happiness
gasoline
sound
bacteria
cell
Matter: Toothpaste, Gasoline, Bacteria, Cell
Non-matter: Happiness, Sound.
Explanation:
The substances which occupies mass or volume occupying space is known as matter. It comprises of those things that can be seen through the eyes and it may include things like water, plants, food, dresses, etc. It can be defined by color or hardness.
The substances that are made of energy without occupying space is known as non-matter substances. It can be classified as form of some energy. Some examples include light energy from torch, heat energy from fire and sound energy form whistle, etc.
Which of the following could be classified as matter? Check all of the boxes that apply.
Answer: desk, water, helium and clouds
Explanation:
Answer:
Desk
Water
Cloud
Helium
Explanation:
Edge 2023
On Earth, water exists as
Answer:
a resource
Explanation:
people and animals drink it and it keeps use from being dehydrated.
A solid, a liquid, and a gas.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. What power does the pirate supply? A) 75 W B) 100 W C) 125 W D) 250 W
Answer:
C
Explanation:
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
Answer is C.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
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All of the elements heavier than oxygen are created by fusion reactions in _____.
All stars at birth begin to fuse hydrogen to form helium through nuclear fusion.
However, when the "fuel" of the star (hydrogen and helium) is exhausted, the star will become a red giant and begin to form other elements heavier than oxygen, and then when the star is in the supernova phase, it will generate the rest of the heavy elements that exist in the periodic table, which are even heavier than iron.
Therefore:
All of the elements heavier than oxygen are created by fusion reactions in red supergiants and supernovas.
8.
An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because _____.
Black soot decreases the albedo of snow, leading to increased absorption of solar radiation and faster snow melting due to positive feedbacks in climate dynamics.
Explanation:An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because the darker-colored soot absorbs more solar radiation than the light-colored snow. Unlike snow, which has a high albedo and reflects most solar radiation, soot has a low albedo and thus absorbs more heat, leading to faster melting of the snow. This process is a part of positive feedbacks in climate dynamics, where an initial change is amplified by the effects it induces, such as increased absorption of solar energy leading to further melting.
Exposure to what type of radiant energy is sensed by human skin as warmth?
gamma rays
infrared
X-rays
ultraviolet
Answer:Another name for heat energy is... Infrared waves. These cannot be seen by your eyes but can be felt by your skin. ... Gamma Rays. ... Which type of electromagnetic radiation can result in sunburns and skin cancer? Ultraviolet Radiation ... X Rays. What is the distance between one point of a wave to the same point in the ...
Answer:
INFRARED
Explanation:
I TOOK THE TEST
~ K12 STUDENT
8TH GRADE
GOOD LUCKK!! :)
A small 17 kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?
Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.
This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.
The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).
A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.
Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J
.
Acceleration is a vector quantity
Acceleration is a vector quantity because it has both magnitude and direction.
Acceleration is a vector quantity that describes how an object's velocity changes over time in both magnitude and direction. It has both magnitude and direction, making it a vector, and is measured in meters per second squared.
Explanation:Acceleration is a vector quantity which means that it has both magnitude and direction. Acceleration provides information about how the motion of an object changes over time. It is always in the same direction as the change in velocity, which is also a vector. Since velocity can change in magnitude (speed) or direction, acceleration can be a change in speed, direction, or both. The SI unit for acceleration is meters per second squared (m/s²). An important aspect to note is that acceleration does not convey the actual velocity of the object; it only describes how the velocity is changing.
two tenses R1 and R2 are connected in parallel across a supply. what is the ratio of heat produced in resistances R1 and R2.
**please tomorrow is my exam,
if you answer I'll mark you brainliest
Answer with explanations:
V=I1*R1=I2*R2 (when R1 and R2 are connected in parallel)
Therefore, rearranging above, I1/I2=R2/R1
Heat produced = I^2R
Ratio of heat produced by R1 and R2
= (I1^2*R1) / (I2^2*R2 )
= (I1/I2)^2 * (R1/R2)
= (R2/R1)^2 * (R1/R2)
= R2/R1
Why are fossil fuel resources sometimes referred to as "buried sunshine"?
Answer:
Fossil fuel resources sometimes referred to as "buried sunshine"? Because they make the Earth warm because they are found deep in the Earth and the energy stored in them was obtained from the sun long ago because they produce energy the same way the sun does all of the above.
Explanation:
Answer:
Explained
Explanation:
All plants or producers which there food by sunlight with help of a process called photosynthesis. These plants are eaten by consumers that is animals and plant eaters are eaten by animal eaters. In this process the energy is transmitted. Although the primary source of energy is sun. These plants and animals when dead are buried under the earth to form fossil fuels. This why fossils are sometimes referred as " buried sunshine"
An object that has the ability to do work has __________ energy.
Answer:
Kinetic energy. ( i didnt reallysee if someone answered already but if so, sorry!)
Answer:Kinetic energy
Explanation:
2. A person began running due east and covered 15 kilometers in 2.0 hours. What is the average velocity of the person?
Answer:
7.5 km/h (2.1 m/s) due east
Explanation:
The average velocity of the person is given by:
[tex]v=\frac{d}{t}[/tex]
where
d is the displacement
t is the time taken
In this problem,
d = 15 km is the displacement
t = 2.0 h is the time elapsed
so the average velocity is
[tex]v=\frac{15 km}{2.0 h}=7.5 km/h[/tex]
and the direction is the same as the displacement (east).
We can also convert the velocity into SI units (m/s). We have:
d = 15 km = 15,000 m
t = 2.0 h * 3600 s/h = 7200 s
[tex]v=\frac{15,000 m}{7200 s}=2.1 m/s[/tex]
Answer: the answer is 7200s
Explanation: i just now it
Please brainliest
in a compressing spring in a toy dart gun, 0.8 j of work is done. when the gun is fired, rhe spring gives its potential energu to a dart with a mass of 0.04 kg. what is the darts kinetic enegy when it leaves the gun?
Answer:
0.8 J
Explanation:
According to the law of conservation of energy, all the elastic potential energy stored in the spring is converted into kinetic energy of the dart:
[tex]U=K[/tex]
where we have
[tex]U=\frac{1}{2}kx^2[/tex] is the elastic potential energy of the spring, where k is the spring constant and x is the compression/stretching of the spring
[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy of the dart, where m is the mass and v is the speed
The elastic potential energy of the spring is equal to the work done in compressing it, so
U = 0.8 J
and according to the law of conservation of energy, the kinetic energy gained by the dart is exactly equal to the potential energy stored in the spring:
K = U =0.8 J
What does the law of conservation of energy state about energy in a closed system?
The total amount of energy in a closed system must stay constant.
Answer:
The system's energy can not be created, or destroyed. It's transformable from one shape to another. The energy stays conserved in a closed system. It is isolated in the surrounding area.
The speedometer in your car reads 55 mi/h. This represents the _____ of the car.
The mileage of the car how fast it is going
The speedometer in your car reads 55 mi/h. This represents the Instantaneous speed of the car.
Explanation:
Speed is a measurement of distance and time. Speedometers have been installed in vehicles to indicate the speed at which the driver drives the vehicles and control is also been used in few vehicles for the safety of the passengers like in school buses. When the car reads a reading in the speedometer, it denotes the instant speed of the car rather than the average speed.
A friend doesn’t believe there are mountain ranges at the bottom of the ocean. About which of the following does he need more information
Answer:Tectonic Plates
Explanation:The ocean floor is part of the Earth's crust, which is made up of tectonic plates that all collide with eachother and form mountain ranges. Sometimes these ranges and valleys are under the ocean.
difference between G and g
Explanation:
G is the universal constant of gravitation, approximately 6.67×10⁻¹¹ m³/kg/s².
g is the acceleration due to gravity. It's defined by the universal law of gravity as:
g = MG / r²
where M is the mass of the planet and r is the distance from the planet's center to the object.
Near the surface of the Earth, g is approximately 9.8 m/s².
what term describes the rate at which electric energy is used
Answer:
Power (P)
Explanation:
In electromagnetism, power is defined as the rate at which electric energy is used:
[tex]P=\frac{E}{t}[/tex]
where
E is the electric energy
t is the time
Power is measured in Watts (W), where 1 W corresponds to 1 Joule per second (1 J/s).
In electric circuits, power can be also rewritten as
[tex]P=VI[/tex]
where
V is the voltage drop on the element we are considering
I is the current flowing through the element
The power dissipated through a resistor is also written as
[tex]P=I^2 R[/tex]
where I is the current through the resistor and R the resistance.
The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the
Answer:
The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.
The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.
Explanation:
The term photo is used to define light and so photoelectric effect defines the phenomena when the light falls on the metal and the resultant effect of electrons on the surface of the conductor. Photoelectric effect also known as photoemission.
When the light is made to be incident on the surface of a conductor, electrons are discharged or released from the metal. Here the energy of the light acts as a work function so that it is used for the energy that is required to emit electrons.
A pendulum has 232 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?
Answer:
232 J
Explanation:
Energy is conserved. All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.
a simple pendulum has a period of 3secs. if the value of g is 9.9m/s^2. calculate the length of the pendulum
Answer:
2.3 m
Explanation:
A simple pendulum has a period of:
T = 2π √(L/g)
If T = 3 seconds and g = 9.9 m/s², then L is:
3 = 2π √(L/9.9)
3/(2π) = √(L/9.9)
(3/(2π))² = L / 9.9
L = 9.9 (3/(2π))²
L ≈ 2.3 m
To calculate the length of the pendulum, use the formula T = 2π√(L/g). Rearrange the formula, plug in the given values for T and g, and solve for L.
Explanation:To calculate the length of the pendulum, we can use the formula for the period of a simple pendulum which is T = 2π√(L/g). In this case, we are given that T = 3 sec and g = 9.9 m/s². Plugging in these values, we can rearrange the formula to solve for L:
T = 2π√(L/g)
3 = 2π√(L/9.9)
Squaring both sides of the equation, we get:
9 = 4π²(L/9.9)
Dividing both sides of the equation by 4π² and multiplying by 9.9, we get:
L = (9.9 * 9) / (4π²)
Calculating this expression, we find that the length of the simple pendulum is approximately 0.250 m.
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What is the source of the radioactivity in the sun
Answer:
Fusion of Hydrogen to form Helium
Explanation:
The sun is a big ball of gas and it provides solar energy that drives external processes on the earth surface.
The pressure and temperature within the sun provides energy to fuse abundant hydrogen atoms together to form helium atoms. This nuclear fusion process releases a huge amount of energy.
The fusion of hydrogen atoms to form helium is the source of radioactivity in the sun.
Look at the figure, which shows the motion of three balls. The curved paths followed by balls B and C are examples of _____. projectile motion rolling friction linear motion fluid friction
Answer:the answer is projectile motion
Explanation:
Answer:
projectile motion
Explanation:
what are the effect of propagation of light
The propagation of light describes how light spreads out from a source and diminishes in intensity with distance, following the inverse square law. This concept is vital in fields like sample analysis and lithography. Understanding light propagation is essential for theoretical and practical physics and technology applications.
The propagation of light is an essential concept in physics with significant implications. When light travels from a source, such as a lightbulb, it expands in all directions, covering an ever-widening area. Because the total amount of light doesn't change, the amount of light in any given place decreases as the distance from the source increases, illustrating the inverse square law.
This weakening of light intensity has various practical applications:
Sample Analysis: In scientific research, when a sample is illuminated, and its scattered light is measured, the detected light is affected by both the sample and the propagation effects. Lithography: When printing patterns onto substrates using a mask, the light reaching the photoresist is altered by propagation. Therefore, masks must be designed to account for this to ensure the correct pattern is transferred.Additionally, the wave-like nature of light is crucial in understanding interference and diffraction, as evidenced by the double-slit experiment. This experiment demonstrated that light behaves as a wave, creating observable interference patterns.
Overall, understanding how light propagates is vital for theoretical science and practical applications in technology and industry.
49. The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. At this
point it comes to its leftmost position. What is its kinetic energy at this point?
A. -0.3 J
B. zero
C. 0.3 J
D. 375 N/m
Answer:
B. zero
Explanation:
The total mechanical energy of a spring is equal to the sum of its kinetic energy, K, and its potential energy, U:
[tex]E=K+U[/tex]
Where
[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy, where m is the mass and v is the speed
[tex]U=\frac{1}{2}kx^2[/tex] is the potential energy, with k being the spring constant and x the displacement
The total mechanical energy is conserved during the entire motion of the spring. We have two particular situations:
- At the equilibrium position, the displacement is zero: x=0, so U=0 and the kinetic energy is maximum.
- At the position of maximum displacement (so the leftmost or rightmost position), the displacement is maximum, so U is maximum while the speed is zero (v=0), and therefore the kinetic energy is also zero: K = 0.
Therefore, the correct answer is
B. zero
A nonconservative force does the same work regardless of the path taken. True or false ?
How much force does the ground exert a 120 pourd person that is standing still?
Answer:
529.2 N
Explanation:
First of all, we need to convert the mass of the person into kg. We have:
1 pound = 0.45 kg
So
[tex]m=120 p \cdot 0.45 kg/p = 54 kg[/tex]
Now the force exerted by the ground on the man is equal to the weight of the man:
[tex]F=mg[/tex]
where
g = 9.8 m/s^2 is the acceleration due to gravity
Substituting
[tex]W=(54 kg)(9.8 m/s^2)=529.2 N[/tex]