Given,
A 42,000 kg train car travelling at 10 m/s toward a stationary train car with a mass of 40,000 kg.
What is momentum?Momentum is a product of the mass of a particle and its velocity. Momentum is a vector quantity which means it has both magnitude and direction. Its formula = mass × velocity.
Solve for momentum:
M= (42,000kg)(40,000kg) / (10m/s)
M = 42,000 kilograms - 40,000 kilograms
M = 2,000kg
M = 2,000 kg ÷ 10m/s
= 200m/s
-Thus they collison at the same speed of 200m/s.
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3. (b) How does crossing over increase the variation in the gametes (and hence the offspring)?
Answer:
During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material. Gametes gain the ability to be genetically different from their neighboring gametes after crossing over occurs.
How are the hip bones in a frog different from the human pelvis?.
Answer:
Just like in a person's arms, in a frog's front legs are bones called the humerus, the radius and the ulna. However, a frog's radius and ulna are fused into one bone. The same is true for a frog's legs -- the femur supports its upper leg, and the bones of the lower leg, the tibia and fibula, are fused.
The frog's larger back legs consist of a femur as the strong, upper leg support, just like in humans, albeit on a different-sized scale. The back legs also consist of a fibula, as well as tibia; however, on the frog these two bones are fused together into one.
How do Kepler’s laws describe planetary orbits?
1) Planets move in elliptical orbits with the sun at one focus.
2) Planets speed up when they are closer to the sun because of the sun's gravitational pull.
Explain whether releasing a tropical fish, like a clownfish, into Artic waters would be likely to result in an invasive population of clownfish.
HELP ASAP!! The explanation can be short and sweet, but reasonable. Thanks
What happens during glycolysis? A. Hydrogen is removed from water. B. Carbon dioxide is produced. C. Glucose is split into two molecules of pyruvic acid.
Answer:
I'm pretty sure its C. Glucose is split into two molecules of pyruvic acid
Humans currently rely on fossil fuels for the majority of their energy needs. A. Why can't humans always use fossil fuels for energy? (5 points) B. What two steps would you take to conserve fossil fuels? (4 points) C. What two impacts do fossil fuels have on the environment? (6 points)
Answer:
I am going to answer the questions in one brief summary of fossil fuels.
Fossil fuels are non-renewable, meaning one day they will run out.
Fossil fuels are reliable, meaning rain or shine we can use them.
Fossil fuels emit greenhouse gases, causing our world to warm up.
Excretion and the Kidneys The kidneys remove excess water, minerals, and other waste products from the blood. The cleansed blood returns to circulation. Each kidney has nearly a million processing units called nephrons. Filtration and reabsorption occur in the nephrons.
- Filtration is the passage of a fluid or gas through a filter to remove wastes. The filtration of blood in the nephron takes place in the glomerulus, a small, dense network of capillaries. Each glomerulus is encased by a cuplike structure called Bowman's capsule. Pressure in the capillaries forces fluids and wastes from the blood into Bowman's capsule. This fluid is called filtrate.
- Most of the material that enters Bowman's capsule is returned to circulation. The process by which water and dissolved substances are taken back into the blood is called reabsorption.
- A section of the nephron tubule, called the loop of Henle, conserves water and minimizes the volume of filtrate. The fluid that remains in the tubule is called urine.
For Questions 7-10, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true.
____________7. Each kidney has nearly a million individual processing units called capillaries.
Each kidney has nearly a million individual processing units called capillaries is false as the units are called nephrons.
What are the nephrons?
Nephron, processing unit of the kidney, the shape that certainly produces urine withinside the procedure of doing away with waste and extra materials from the blood.
The nephrons paintings via a two-step procedure: the glomerulus filters your blood, and the tubule returns wanted materials for your blood and eliminates wastes. Each nephron has a glomerulus to clear out out your blood and a tubule that returns wanted materials for your blood and pulls out extra wastes.
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When does the amount of photochemical smog peak?
a. dawn
b. midday
c. twilight
d. night
From what ive found it is morning and afternoon so I have no idea what to choose
In one cubic meter of the ocean, photosynthetic plankton produce 80,000 calories of energy each year. How many calories of energy are available in the bodies of the creatures that eat that plankton?
Select one:
a.
80,000
b.
8,000
c.
800
d.
80
8000 calories of energy are available in the bodies of the creatures that eat that plankton. Details about calories can be found below.
How to calculate energy available?In a natural habitat, living organisms feed on one another to derive energy needed for their metabolic activities.
However, only 10% of energy available is transferred to the organism because 90% (most) of the energy is used for the organism's metabolism.
According to this question, in one cubic meter of the ocean, photosynthetic plankton produce 80,000 calories of energy each year.
Therefore, 10/100 × 80,000 calories = 8,000 calories of energy are available in the bodies of the creatures that eat that plankton.
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Anyone know a research question.
I don’t know what topic to put in it.
Claim: Mental illness is inherited
O warn people about which food is safe to eat o develop a strategy to prevent future algal blooms o warn people to stay away from the affected area o evacuate all wildlife from the bay
Answer:
evacuate all wildlife from the bay
Explanation:
Answer: The answer is to evacuate all wildlife from bay.
Explanation:
how is a leopard frog like a human?
Answer: They scream when being killed
Explanation:
Leopard frogs (genus Lithobates) and humans (Homo sapiens) are both living organisms and share certain characteristics as part of the animal kingdom.
Few points of comparison between leopard frogs and humans:
1. Classification: Leopard frogs and human beings are both considered to be vertebrates, which means they both have a backbone and are within the phylum Chordata.
2. Body Structure: Both leopard frogs and humans have a bilateral symmetry, meaning their bodies can be divided into two equal halves.
3. Sensory Organs: Both have sensory organs such as eyes, ears, and a sense of touch, allowing them to perceive their environment.
4. Reproduction: Both reproduce sexually, with males and females coming together to produce offspring.
5. Respiration: Humans and leopard frogs both have a respiratory mechanism that enables oxygen inhalation and carbon dioxide exhalation. However, the two species' unique respiratory structures and systems are different.
6. Homeostasis: Leopard frogs and human beings both work to keep their internal environments in balance and homeostasis by controlling things like body temperature, pH levels, and metabolic activities.
Thus, similarities are seen in their body structure, sensory organ, reproduction, respiration, and Homeostasis.
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4. Why isn't all the energy transferred by sunlight available to plants?
Which example is indirect evidence used to study Earth’s interior?
composition of minerals in a rock
age of a rock from within Earth
location of an earthquake’s epicenter
texture of different core samples
Answer:
location of an earthquake’s epicenter
An indirect evidence is one which is used to infer or support the clause. The location of an earthquake’s epicenter can be used to study Earth’s interior.
Three main layers make up the Earth. The crust, mantle, and core are those. Additionally, since the earth's interior cannot be directly studied, the composition of rocks can be understood from direct evidence.
Seismic waves aid in comprehending circumstantial evidence. The energy that passes through the various layers of the earth is carried by seismic waves. Landslides, earthquakes, and volcanoes are some of the causes. The direction of the seismic wave, as well as the location of the earth's epicenter, can be determined by analyzing several seismographs.
Therefore, studying the location of an earthquake’s epicenter would give an idea of Earth’s interior. The correct answer is option C.
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If the genotype is heterozygous, what is the expressed phenotype?
Rr
dominant
recessive
RR
Help will give brainilist
Answer:
mass
orbit
pounds
Explanation:
Pls help fast!
I wanted to see if my answers were right
which are : A, B D.
Answer:
C,A,A are the correct answers
Magnifying Living Things
a leaf,tree bark,skin,flower.hair strand,grass
Did you observe any other characteristics of life in your samples?
For each of your samples, research how the structures you observed under magnification help the organisms carry out basic functions of life.
The characteristics of life observed in the samples was the presence of different types of cells.
What is Magnification?This is defined as the process of enlarging the apparent size of an object through objects such as a microscope.
The structures observed under magnification of leaves include the epidermal cells which help the organisms carry out gaseous exchange.
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N5 bio- what is cellular respiration?
How does the color change for a positive starch test?
Answer:
When starch is present, it turns from brown to blue-black or purple.
Explanation:
Hope this helps
1. (b) Where does the light independent phase of photosynthesis occur?
Explanation:
The light-independent reactions of photosynthesis take place within the stroma. It contains enzymes that work with ATP and NADPH to “fix” carbon from carbon dioxide into molecules that can be used to build glucose. The chloroplast's own genetic material (separate from that of the cell) is also stored in the stroma.
How do climate and weather differ?
A- weather is predictable
B- weather changes quickly
C- climate changes with seasons
Answer:
A. weather is predictable climate is not
Explanation:
How is earth’s motion related to the origin of the galaxy and it’s solar system?
Question:
How is earth’s motion related to the origin of the galaxy and it’s solar system?
Answer:
The Earth is a part of the galaxy and its solar system and as Earth was created with the big bang, it happened inside of them.
Explanation:
The relative motion of the Earth around the solar system is the Earth is moving and spinning around at a tilt. Our solar system in the galaxy is moving and the galaxy in the universe is constantly moving. They are all moving around a a central object just as the Earth revolves around the Sun.
Answer: The Sun's rotational equator is in the same flat plane. Earth was believed to be the center of the universe, which consisted only of those planets visible with the eye and an outlying sphere of fixed stars.
Explanation:
Integrating sensory information and neural functions is a function of the __________. a. forebrain b. cerebrum c. thalamus d. cerebellum please select the best answer from the choices provided a b c d
Integrating sensory information and neural functions is a function of the cerebrum (i.e., the brain).
What is the cerebrum?The cerebrum or brain is the most important organ associated with functions of the nervous system.
The cerebrum is an organ that coordinates complex functions such as speech, movements, etc.In conclusion, integrating sensory information and neural functions is a function of the cerebrum (i.e., the brain).
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natural selection is the changes of size and shape of living things in
Answer:
natural selection is the changes of size and shape of living things in their body or body skeleton
How does noise affect a signal?
Explanation:
Noise is an unwanted signal which interferes with the original message signal and corrupts the parameters of the message signal. This alteration in the communication process, leads to the message getting altered. It is most likely to be entered at the channel or the receiver.
Describe how soil provides nutrients for plants
- List any essential nutrients for plant growth (hint search: NPK and plants)
Describe each nutrient briefly (one-two sentences each)
Use of fertiliser to supplement plant growth
Answer:
microrganism or microbes,break down organic compounds in to inorganic compounds in a process called mineralization
which stem adaptation is most helpful in protecting a plant from disease
Answer:
The outer layer of a plant—analogous to our skin and also called the epidermis—is the first defense to keeping pathogens out.
Explanation:
The epidermis itself is shielded by additional layers on certain plant parts: bark on a tree, a waxy cuticle on leaves. Plants also produce chemicals that are toxic to pathogens or to insects.
Lake Victoria in East Africa is home to many species of fish called cichlids. In 1954 the predatory Nile perch was introduced to Lake Victoria. The Nile perch became the dominant fish species in the lake by the mid-1980s. The number of cichlid species in the lake decreased as the Nile perch population increased. The perch preyed heavily on cichlid species that fed on algae and debris on the bottom of the lake. Algae in the lake increased, and oxygen levels decreased. The surface area of the gills of some cichlid species has increased in over 20 years.
A. Increased gill surface area has allowed the cichlids to change their diet and avoid competing with the Nile perch.
B. Increased gill surface area has allowed the cichlids to be camouflaged and avoid being eaten by the Nile perch.
C. Increased gill surface area has allowed the cichlids to leave Lake Victoria and establish populations in nearby bodies of water.
D. Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
Answer:
D. Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
Explanation:
As the Nile perch fed on cichlid species that feed on algae, algae growth increased in the lake. The algae absorbed more oxygen, leaving less for the fish. Those with larger gills were able to absorb oxygen more efficiently, and were able to survive.
What is the driving force of the North Equatorial Current in the Atlantic Ocean? What
causes this driving force?
Answer:
The primary driving forces of the surface currents are the thrust by the trade winds and westerlies.
Explanation: