Solution 1
Answer:
Pam rubs a glass rod with wool, then moves the rod over a pile of small paper scraps. The scraps leap into the air and stick to the rod.
Solution 2
Answer:
The electric force acting at a distance can be observed when someone rubs a glass rod with something woolen then the rod is taken away from the woolen material. The piece of paper leaps into air and sticks on to the rod. This is due to the electrostatic force of attraction that the paper sticks on the glass rod.
Explanation:
📚 Related Questions
Answer:The process by which modern organisms have descended from ancient organisms over time
Common ancestor An ancestor shared by two or more descendant species
Natural selection Evolutionary mechanism in which individuals that are better suited to their environment survive and reproduce most successfully
Variation Difference between traits in individuals of the same species
Adaptation A trait that improves an organism's ability to survive and reproduce in an environment
Fitness The ability of an organism to survive and reproduce
Artificial selection Selective breeding of organisms to promote the appearance of desirable traits in offspring
Genetic drift A mechanism of evolution in which allele frequencies of a population change over generations due to chance
Darwin's theory of evolution
Charles Darwin developed a theory of evolution to explain the unity and diversity of life, based on the idea of shared common ancestors.
Natural selection
Darwin's theory was based on the mechanism of natural selection, which explains how populations can evolve in such a way that they become better suited to their environments over time.
Light colored mice are more easily seen by predators and are therefore preyed upon more. Dark mice are better adapted to their environment and better able to survive and reproduce.
Light colored mice are more easily seen by predators and are therefore preyed upon more. Dark mice are better adapted to their environment and better able to survive and reproduce.
Natural selection acting on mice population over time.
Individuals have variations within their heritable traits. Some variations make an individual better suited to survive and reproduce in their environment.
If this continues over generations, these favorable adaptations (the heritable features that aid survival and reproduction) will become more and more common in the population.
The population will not only evolve (change in its genetic makeup and inherited traits), but will evolve in such a way that it becomes adapted, or better-suited, to its environment.
Artificial selection
There are other types of selection, in addition to natural selection, that are out there in the world.
Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection.
A timeline showing how dogs became domesticated over a long period of time due to artificial selection.
A timeline showing how dogs became domesticated over a long period of time due to artificial selection.
Dog breeding is a perfect example of how humans select for desirable or fashionable traits. Breeders deliberately mate parents with the hope of producing offspring with specific traits (such as color, size, ear shape, snout length, and so on).
Common mistakes and misconceptions
Evolution is not the same as adaptation or natural selection. Natural selection is a mechanism, or cause, of evolution. Adaptations are physical or behavioral traits that make an organism better suited to its environment.
Heritable variation comes from random mutations. Random mutations are the initial cause of new heritable traits. For example, a rabbit can't choose to have a different fur color. Rather, a genetic mutation causes a difference in fur color, which may help that rabbit hide better in its environment.
Natural selection acts on existing heritable variation. Natural selection needs some starting material, and that starting material is heritable variation. For natural selection to act on a feature, there must already be variation, and that variation must be able to be passed on to offspring.
Natural selection depends on the environment. Natural selection doesn't favor traits that are somehow inherently superior. Instead, it favors traits that are beneficial in a specific environment. Traits that are helpful in one environment might actually be harmful in another.
Explanation:
Answer:
C
Explanation:
It is C
Answer:
A Van Allen radiation belt is a zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnetic field. Earth has two such belts, and sometimes others may be temporarily created
Explanation:
Light-fur mice survive less often on dark rocks, compared to dark- figure mice because light - mice are easily seen by predators, while dark - figure are not easily seen by predators.
What is predator ?
Any species that preys on other animals and survives by killing and devouring them. Predators such as wolves and bears. Rabbit population is regulated by large carnivores.
Predators are living things that go for and kill prey. The term "prey" refers to the living things that predators eat. Both carnivores and omnivores may be predators. Predators including lions, tigers, sharks, and snakes.
Thus, Light-fur mice survive less often on dark rocks, compared to dark- figure mice because light - mice are easily seen by predators, while dark - figure are not easily seen by predators.
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Answer:
Light fur mice can be easily spotted by predators among the dark rocks
17.3 moles of NH₃ were produced.
The reaction above talks about the production of ammonia NH₃
To solve this question, we'll begin by writing the balanced equation for the reaction between H₂ and N₂. This is illustrated below:
3H₂ + N₂ —> 2NH₃
From the balanced equation above,
3 moles of H₂ reacted to produce 2 moles of NH₃.
Therefore, 26 moles of H₂ will react to produce = (26 × 2)/3 = 17.3 moles of NH₃.
Thus, 17.3 moles of NH₃ were obtained from the reaction.
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Answer:
Ammonia can be prepared using Haber process based on the following equation:
3H2 + N2 <.........> 2NH3Explanation:
Answer:
Some places have more earthquakes than others because they sit on the edges of tectonic plates.
Answer:
H - Hydrogen
He - Helium
Li - Lithium
Be - Beryllium
B - Boron
C - Carbon
N - Nitrogen
O - Oxygen
F - Fluorine
Ne - Neon
Na - Sodium
Mg - Magnesium
Al - Aluminum
Si - Silicon
P - Phosphorus
S - Sulfur
Cl - Chlorine
Ar - Argon
K - Potassium
Ca - Calcium
Explanation:
Answer:1 Hydrogen H
2 Helium He
3 Lithium Li
4 Beryllium Be
5 Boron B
6 Carbon C
7 Nitrogen N
8 Oxygen O
9 Fluorine F
10 Neon Ne
11 Sodium Na
12 Magnesium Mg
13 Aluminum Al
14 Silicon Si
15 Phosphorus P
16 Sulfur S
17 Chlorine Cl
18 Argon Ar
19 Potassium K
20 Calcium Ca
Explanation:
If we count two atoms every seconds, then the time taken to count one mole of atoms that is 6.02×10²³ atoms is 3.0×10²³ seconds. If we continually count the atoms it will take the time which is longer that the age of earth.
What is one mole of atoms?
Any substance that contains 6.02×10²³ atoms is called its one mole. this number that is, one mole of an atom is called the Avogadro number.
The time for counting two atoms is one second then the time to count 6.02×10²³ atoms is 6.02×10²³ /2 = 3.0×10²³ seconds.
One year have about 31556926 seconds. 3.0×10²³ seconds comprises 3.0×10²³ /31556926 = 9.53×10¹⁵ years. Age of earth is 4.5 × 10⁹ years.
Therefore, it will take longer time to count one mole of atoms than the age of earth.
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Answer:
It would take 9.54 x 10^15 years to count 1 mole of atoms which is 10^6 times the age of Earth.
Explanation:
Answer:
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases of that substance coexist in thermodynamic equilibrium. It is that temperatureand pressure at which the sublimation curve, fusion curve and vaporisation curve meet.
Answer:
At the triple point, all three phases (solid, liquid, and gas) are in equilibrium. Since the triple point is a point, there is only one temperature and one pressure where the three phases will exist. This fact often helps in identifying compounds or in problem solving.