Americium-241 isotope would be expected to have the longest half-life. Hence, option (D) is correct.
What is half-life?
In radioactivity, the half-life is the time required for one-half of a radioactive sample's atomic nuclei to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time required for the number of disintegrations per second of a radioactive material to decrease by one-half.
According to given data:
Rate of decay is the highest for Mercury-194, hence, its half-life is least. Then rate of decay is lowest for Americium-241, hence, its half-life is the longest. Hence, option (D) is correct.
The order of half-life according to the data is:
Americium-241 > Silver-108 > Californium-249 > Mercury-194.
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A Motion Demonstration Model is shown in the diagram. At which of these positions does the ball have both the greatest potential energy and the least kinetic energy?
A) Position W
B) Position X
C) Position Z
D) Position Y
Answer:
C
Explanation:
While playing hockey in gym class, Timmy is trying to send a plastic puck across the floorand into the goal. Which of the following best describes the forces acting on the plastic puck as it travels across the floor and into to the goal?
A.electromagnetic and gravity
B.gravity and friction
C.mechanical force and friction
D.magnetism and friction
Answer:
C. mechanical force and friction
Explanation:
Timmy's muscles are striking the puck through the stick. The force from the muscles moves the sick, which hits the puck. (EDIT) In addition, the puck is slowed as it travels across the floor, via friction.
Answer:
gravity and friction
Explanation:
How many paired sets of electrons would be found on an electron dot model of sulfur?
A 1
B 2
C 3
Boyle’s Law: When____ is held constant, the pressure and volume of a gas are___ proportional.
It didnt give me a word bank
No link answers please
Answer:
When temperature is held constant, the pressure and volume of a gas are not proportional.
Explanation:
That is Boyle's Law
Boyle’s Law states that, when temperature is held constant, the pressure and volume of a gas are inversely proportional.
What is meant by gas laws ?Gas laws are defined as the laws that govern the properties of gases by determining the relationships between the pressure, volume and temperature of the gases.
Here,
Boyle's law is the gas law that governs the relationship between the pressure and volume of gases.
Boyle's law states that, for an ideal gas at a unit mass, the pressure of the gas is inversely proportional to the volume of the gas, at constant temperature.
P [tex]\alpha[/tex] 1/V
PV = a constant
When the temperature of the gas is held constant.
Hence,
Boyle’s Law states that, when temperature is held constant, the pressure and volume of a gas are inversely proportional.
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if a reaction starts with 30 grams how many should it end with?
This is a schematic for a clothes dryer appliance. This appliance dries clothes primarily by converting--
A) Thermal energy into electrical energy
B) Electrical energy into thermal energy and mechanical energy
C) Kinetic energy into thermal energy
D) Electrical energy into mechanical energy
The cloth dryer appliance works on the energy transformation from electrical energy into mechanical energy and thermal energy. Hence, option B is correct.
What is energy transformation?According to energy conservation law, energy can neither be created nor be destroyed but it can be transformed from one form to the other. Thus, energy lost by one form can be gained in other form.
In electrical devices, electrical energy is converting to various other forms. For instance, in lamps, electrical energy is converted to the light energy. Similarly in fan electrical energy is converted to the mechanical energy.
In a cloth dryer the electrical energy is converted to the mechanical energy to make it operate and this further produces the thermal energy sufficient to dry the clothes.
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Calculate the energy transferred by a 12V hairdryer, running on a current of 0.50A, that is left on for 8.0 minutes.
What is a disadvantage of using nuclear power to produce electricity?
A.
Nuclear waste must be safely stored for many years.
B.
Nuclear fission produces less energy than burning coal or oil.
C.
Nuclear waste must be burned which produces carbon emissions.
D.
Nuclear fission releases more air pollution than burning coal.
Answer:
A
Explanation:
Shante makes a diagram to compare the effects of short-term and long-term environmental changes. Which statement should she place in the region marked X? Cause speciation Affect organisms Are caused by plate tectonics Are driven by solar energy changes
No links please or i will say a few things you won't like : )
I really need help with this!! Will give brainliest if you help T^T
Answer:
What inferences can you make about the melting points of the different substances and the motion of their particles, based on the data? (ignore that needed it here so i could see it better.)
Explanation:
Butter has a lower melting point than the cheese and the wax. The motion of the cheese were a little separated while the butter articles have more space in between. The wax had the closest particles.
I dont know if that makes sense?
have u ever wanted to just sleep all day and night
Answer:
yes ofc
Explanation:
name all of the processes of the rock cycle... and number them by the picture.... no links
Answer:
1. magma
2. igneous rock
3. sediments
4. sedimentary rock
5. metamorphic rock
6. melting
7. cooling, heating
8. weathering and erosion
9. compaction and cementation
10. heat and pressure
11. heat and pressure
12. weathering and erosion
Explanation:
just trust me .!!
Does sombrero galaxy orbit around anything?
Answer:
yes
Explanation:
Answer:
yes
Explanation:
Which characteristics belong to Whittaker’s classification system? Select two options.
a.three domains
b.six domains
c.two kingdoms
d.five kingdoms
e.five levels
f.seven levels
g.eight levels
Answer:
Five kingdoms & Seven levels
Explanation:
Robert H. Whittaker proposed five kingdom classical system for living organisms in 1969. These were: Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Animalia, and Kingdom Plantae. His work was the improvement of earlier work conducted by Carl Linnaeus who proposed three kingdom classification system (Animalia, Plantae, and Protista).
Whittaker's system further categorized each kingdom to seven levels. These were: Kingdom → Phylum → Class → Order → Family → Genus → Species. This categorization was based on similarities in organisms at different levels.
PS: The scientific name of each organism is the combination of genus and family name.
The Humbolt squid can travel 410 meters in 60 seconds. The squids average speed is ____. (Round to the nearest tenth)
Answer:
They swim at speeds up to 24 km/h (15 mph; 13 kn).
Explanation:
Select the statement below that best describes how environmental conditions affect an individual’s likelihood of survival and reproduction.
Explain why you chose the answer you did to the question above.
Answer:
I need more information it depends on the conditions.
I chose this answer because different people have different illnesses and that can effect how their bodies respond to the environmental conditions
Answer: The 2nd box from the top
Explanation: I know because I just did this
Make a 29 day timeline. Along the timeline draw and label the phases of the Moon starting with a full moon, crescent, first quarter, gibbous and full. Finish the second half showing the waning moons back to the new moon.
PLEASE Include the drawing and your answer to the question above
PLEASE NO FAKE ANSWERS.
Giving brainliest if you answer correct1!1!1!1!1!
What happens to the atoms of a substance when it burns?
Answer:All the atoms rearrange to form a different substance or different substances
Explanation:An atom is the smallest unit from which a matter can be made.
When the atoms in a substance get heated, the atoms release energy.
The atoms and molecules combine.
So all the atoms rearrange to create a different substance or different substances.
Im sorry i dont understand pls helpp -w-
How is temperature related to the physical change of a substance?
(100 word paragraph)
pls dont answer just for points
Explanation:
it's about kinetic energy
with more heat particles in a substance get energy
with more cold atoms or molecules lose energy
both change the way particles are arranged
the way particles are arranged make something a has liquid or substance
How well does your physical environment support human activity?
Answer: The physics of human beings is often overpopulated, polluted, fossil-burning and deforested. These adverse effects can influence human behavior and lead to mass migration
Explanation:
Use the diagram below to answer the questions that follow for 1 point each. Predict the change seen in the balloon in the freezer Explain your prediction Use the equation to provide additional support for your prediction
NO LINK ANSWERS
Answer:
The particle model of matter is one of the most useful scientific models because it describes matter in all three states. Understanding how the particles of matter behave is vital if we hope to understand science!
The model also helps us to understand what happens to the particles when matter changes from one state to another.
The following diagram shows different changes of state, as well as which processes are the reverse of each other. Melting and freezing are the reverse processes of each other and so are evaporation (boiling) and condensation.
Explanation:
A 3-kg rock falls for 5 sec. What is its speed after falling for 5 sec? Reminder - Acceleration due to gravity, on Earth = 9.8 m/s/s
Please answer asap
Gaining or losing energy changes the temperature of a substance is that true or false.
Answer:
I think its true
Explanation:
This is a written question.
No link answers please!!!
1.Predict the change seen in the balloon in the freezer
2.Explain your prediction
3.Use the equation to provide additional support for your prediction
Answer:
Solids keep their shape and cannot be compressed. Let us see if the particle model can help us understand why solids behave in this way.
In a solid, the particles are packed close to each other in fixed positions. They are locked into place, and this explains why solids have a fixed shape. Look at the following images of sodium chloride (table salt). Do you remember the formula for sodium chloride?
Macroscopic view of sodium chloride
Submicroscopic view of sodium chloride
Table salt crystals are hard and have a fixed shape.
Can you see how the chloride atoms (purple) alternate with the sodium atoms (yellow) in a fixed arrangement?
Take a good look at the picture of the particles in a solid (table salt) above. You will see that they are packed in a regular arrangement. There are very small spaces between the particles in a solid.
Particles are held together by forces of attraction. In solids, these forces are strong enough to hold the particles firmly in position.
Does that mean the particles in a solid do not move at all? No. The particles in a solid move a little bit. They vibrate in their fixed positions. The more energy the particles have, the faster and more strongly they vibrate.
Do you see how we have used the particle model of matter to explain the properties of solids that we can observe? For example, the particles in solids are closely packed and have strong forces between them explains why solids have a fixed shape and you cannot compress them.
The liquid state
An important characteristic of liquids is that they flow. They fill containers they are poured into. Liquids are also not very compressible. How can these properties be explained?
Orange juice is a liquid, which can be poured.
In the liquid state, particles do not have fixed positions. They move about freely, but they stay close together because the forces of attraction between them are quite strong, but not as strong as in solids.
Have you noticed how a liquid always takes the shape of the container it is in? Within the liquid, the particles slip and slide past each other. This is why liquid flows. Their particles are free to move around, filling the spaces left by other particles. Look at the image of the juice being poured. Let's zoom in and have a look at what the particles are doing as the juice is poured.
The particles in a liquid have small spaces between them, but not as small as in solids. The particles in a liquid are loosely arranged which means they do not have a fixed shape like solids, but they rather take the shape of the container they are in.
The speed at which the particles move around inside the liquid depends on the energy of the particles. When we heat a liquid, we are giving the particles more energy and speeding them up.
In gases, the particles move at even greater speeds.
The gaseous state
Gases spread out quickly to fill all the space available to them. Think of when you blow up a balloon. The air that you blow into the balloon fills up the whole balloon. A gas will fill the entire space that is available to it. This is because the particles in a gas have no particular arrangement.
Gases do not have a fixed shape. Think about the balloon again: the gas fills the entire space inside the balloon. You can squeeze the balloon, changing the shape.
Gases fill the space available to them.
Gases do not have a fixed shape.
Gas particles move very fast, much faster than in solids and liquids. The particles in a gas possess a lot of energy.
Have you ever tried to compress the gas in a syringe or in a bicycle pump? Why do you think you can compress the gas?
In gases, the forces between particles are very weak. This explains why the particles in gases are not neatly arranged. They are not held together tightly and there are large spaces between them. These spaces are much larger than in the solid and liquid state.
Explanation:
Why does autumn start in different months of the year in North America and South America?
A) The earth is tilted on its axis creating different seasons in the North & Southern Hemispheres at different points in its revolution around the sun
B) The earth is at a different distance from the sun due to its revolution
C) The sun is stronger during autumn due to the earth's elliptical orbit.
D) The earth’s tilt causes the Northern Hemisphere to receive more sun year-round Eliminate
Answer:
D
Explanation:
Autumn start in different months of the year in North America and South America due to the tilt in earth's axis creating different distance from the sun for different regions.
What are seasons ?A season is a time of year that can be identified by unique climatic features. Spring, summer, fall, and winter all occur in regular succession. Each has distinctive seasonal variations in light, temperature, and weather.
Each seasons starts at different month in two hemispheres of earth. This s due to the fact that, earth's axis is not perfectly circular and it is slightly tilted towards sun.
When the Northern Hemisphere is tilted toward the sun in June, more of the day is spent being illuminated by the sun's rays than it is in winter. As a result, there are longer daylight hours.
There are fewer daylight hours in December because the Northern Hemisphere is tilted away from the sun. Similarly the autumn season also differ from that of the southern hemisphere.
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I don't get this, you don't really need to explain, I just need the answer.
Thanks!
Answer:
august 19 - low tide, high tide
august 20 - low tide, low tide
Any absurd answers will be reported, no links either. Ill give branliest to someone with the best answer and someone who answered them all correctly
Answer:
1. D
2.C
3. A
4. B
5. D
I tried my best hopefuly you get good grade :)
An archer shot a 0.07 kg arrow at a target. The arrow accelerated at 4,000 m/s2 to reach a speed of 50.0 m/s as it left the bow. During this acceleration, what was the net force on the arrow?
A) 280 N
B) .0000175 N
C) 57,142 N
D) 3.5 N
The net force which has to be applied on the arrow of 0.07kg to accelerate at the rate of 4000m/s² is 280N. Thus, the correct option is A.
What is Force?
A force is an influence which can be a push or a pull that can change the motion of an object. A force can cause an object with some mass to change the velocity, i.e., results into acceleration. A force is a vector quantity as it has both the magnitude and direction.
Force applied on an object can be calculated by the formula:
f = m × a
where, f = force applied,
m = mass of the object,
a = acceleration of the object
Therefore, the force applied on the arrow is:
f = m × a
m = 0.07kg
a = 4000m/s²
f = 0.07 × 4000
f = 280N
Therefore, the correct option is A.
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Okay, I have three more questions.
1.) When a gas or liquid is heated, it warms, expands, and blank because it is blank dense.
2.) When a gas or liquid is cooled, it becomes blank dense.
3.) As the warm gases and liquids rise and cool gases and liquids sinks, it creates a blank.
Science 8 - Electromagnetic Spectrum Worksheet
Answer:
1. Electromagnetic spectrum
2. Electromagnetic radiation
3. Radiant energy
4. Infared waves
5. Electricmagnetic radiation or Infared waves
6. Radio waves
7. Gamma rays
8. Radio waves
9. Ultraviolet rays
10. This is because it doesn’t contain water or a substance.
11. You should use sunscree and a hat to protect your skin from UV light that might cause skin cancer.
Hope this helps