D.No, she is not accelerating because her speed is constant.
The rate of change of velocity with respect to time is known as acceleration.
acceleration =change in velocity/time
As she is running at constant speed and there is no change in velocity so she is not accelerating.
Answer:
nitrogen fixation
Explanation:
nitrogen fixation is the process through which the nitrogen fixing rhizobium bacteria present in the root nodules of leguminous plants I fixes the nitrogen present in the air into the soil
(1) bromine (3) francium
(2) cesium (4) iodine
b. 80,000 units, because total energy remains unchanged
c. 20,000 units, because total energy of the skier decreases
d. 80,000 units, because total energy of the skier decreases
Answer:
30,000 units, because total energy remains unchanged.
Step-by-step explanation:
The law of conservation of energy states that energy cannot be destroyed, it remains conserved but transforms from one form to the other form.
Hence, we can say that
Total energy = kinetic energy (KE) + potential energy (PE).
At 100 meters above
Total energy = 0 + 50000 = 50000 units.
Hence, 60 meters, total energy would be
20,000 + x = 50000 units
Finally,
x = 50,000 - 20,000
= 30,000
The energy will only transform from one form to the other but will not change.
Answer:
See explanation!
Explanation:
To answer this, it would be helpful to first determine what natural selection is. Natural selection is a biological process in which species evolve and adapt over time, in order to better fit their environment.
In any ecosystem, there are going to be limited resources. This simply means that species that are most suitable for the environment will survive and have the chance to reproduce.
This means that the environment determines when natural selection happens, but also what it looks like.
This might be better understood with an example:
For example, after several volcano eruptions in a stretch of the desert, the field mice population, over the next generations, gradually became black, rather than their original tan color.
This is because the vast desert sands were replaced with large patches of black volcano rock, so the mice that were previously able to camouflage and avoid detection by predators now weren't able to.
On the other hand, genetically mutated black field mice now had a far greater chance of surviving, and hence the population of field mice gradually became black.
This example illustrates how a change in the environment, caused the process of natural selection and ultimately the characteristic of having black fur to be more advantageous.
Over time, the process of natural selection made it so that the field mice population was black.
Keywords:
Natural Selection
Environment
Genetic Mutations
Population
Read more about natural selection here:
The medium through which a wave travels depends on the type of wave. Mechanical waves require a physical substance for propagation, while electromagnetic waves can travel through both material mediums and empty space due to their unique field-based nature.
The medium through which a wave travels is the substance or material that carries the energy of the wave from one place to another. Waves can propagate through a variety of mediums, and the nature of the medium has a significant impact on the characteristics of the wave.
In mechanical waves, such as sound waves and seismic waves, the medium is typically a material like air, water, or solid objects. In the case of sound waves, air molecules vibrate as the wave passes through, transmitting compressions and rarefactions that our ears perceive as sound. In seismic waves, the Earth's crust and mantle serve as the medium, with rocks transmitting the wave energy.
Electromagnetic waves, like light and radio waves, do not require a physical medium to travel through. They can propagate through a vacuum, such as space, as well as through materials like air, water, and glass. This is because electromagnetic waves consist of oscillating electric and magnetic fields that can interact with charged particles in matter or propagate freely through the vacuum of space.
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