two people are pushing a box north across the floor. on person pushes with a force of 20n, the other person pushes with an unknown force. if the net force acting on the box is 35n north, what is the unknown force?

The train would need the greatest amount of force due to weight! If you think of it, a baseball won't need much force to stop it, but if you have a heavy train, it will need excessive force to stop the train. The answer would be #3

I hope this answer helps!

Sorry if it doesn't make sense, as I don't know that much about physics! I am just thinking of what makes sense.

Direct observation is a crucial method in scientific studies, allowing researchers to collect firsthand information. Examples include a student observing the sky to note weather conditions and a biologist using a GPS-enabled collar to track a grizzly bear's movements. These instances exemplify the use of senses or instruments to acquire data directly from the source.

The request for an example of direct observation highlights the importance of firsthand experience in data collection in scientific studies. Direct observation involves actively acquiring information through our senses or instruments without any intermediary. One classic example of direct observation is when a student, during a field trip, looks up at the sky to record the weather conditions. This is a simple yet profound activity where the observer uses their sense of sight to gather data about the sky's color, cloud formations, and possibly even the position of the sun or moon. Additionally, a biologist tracking the movement of a grizzly bear using a GPS-enabled collar operates through direct observation, as they collect data generated from the exact source of the phenomenon being observed.

In both instances, the observers use their senses or scientific instruments to gather information about their surroundings or the subject of their study. Whether it is the student noting down the sky's appearance in a journal or the biologist examining GPS data to understand a bear's migration patterns, both scenarios exemplify direct observation. These examples underline the significance of direct observation in acquiring accurate, firsthand information that lays the groundwork for further scientific inquiry and analysis.

Answer:

Velocity, v = 11.91 m/s

Explanation:

It is given that,

Distance covered by the object, d = 274 m

Time taken, t = 23 s

We need to find the velocity of the object. It is given by distance covered divided by total time taken i.e.

[tex]v=\dfrac{d}{t}[/tex]

[tex]v=\dfrac{274\ m}{23\ s}[/tex]

v = 11.91 m/s

So, the velocity of the object is 11.91 m/s. Hence, this is the required solution.

Answer:

Will remain in motion until an external force is applied.      

Explanation:

According to Newton's first law of motion, a body continues to be in state of rest or motion, until and unless an unbalanced, external force acts on it.

In deep space, there is no external force. If a motionless spacecraft uses thrusters to give a push, the spacecraft will continue to be in motion until an unbalance external force acts on it again to stop it or increase its speed or change direction.

This question is a kind of pet riddle. But first to understand the answer, you should what are parakeets are. Parakeets are a kind of parrot that has generally has a long tail. The answer for the riddle is parapets. Parapets are the edge of the roof and also parakeets are also pets.

This question is a kind of pet riddle. But first, to understand the answer, you should what are parakeets are. Parakeets are a kind of parrot that has generally had a long tail. The answer for the riddle is parapets. Parapets are the edge of the roof and also parakeets are also pets.

Explanation:

A parapet could be a barrier that is an extension of the wall at the sting of a roof, terrace, balcony, paseo or different structure. The word comes ultimately from the Italian parapet to (para re "to cover/defend" and petto "breast"). The German equivalent Brustwehr has an equivalent which means.

Circuit B has less current than circuit A, as it has more resistance. This is the correct statement.

Using Ohm's law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R), we can determine the current in each circuit. With both circuits having a 15-volt battery and Circuit A having a resistance of 2 ohms, using the formula I = V/R, we calculate the current in Circuit A to be 7.5 amperes. Similarly, with Circuit B having a resistance of 6 ohms, its current is 2.5 amperes. Consequently, since Circuit B has a higher resistance, it allows for less current to flow compared to Circuit A.

Answer:

the answer is c I got right on USA test prep

Answer:

k

Explanation:

k

If an atom had a nucleus 1 ft in diameter, the diameter of the atom would be approximately 10 miles. This is based on the fact that a typical atom is about ten thousand times larger in diameter than its nucleus.

In physics, we learn that the size of a nucleus is extremely small compared to the overall size of an atom. A lead nucleus with a mass number of 208 has a diameter of about 13 femtometers (fm), which is 10-15 meters, and this is ten thousand times smaller than the typical atom's diameter. If we scale up the nucleus to 1 ft, we keep the same ratio of 1 ft to 10 thousand ft or, in other words, 1 ft to nearly 2 miles (10,000 ft divided by 5,280 ft per mile). Hence, if the nucleus's diameter is 1 ft, the atom's diameter at the same scale would be around 10 miles.

Answer:

C. Having more surface area

When the reaction involves solids, an increased surface area of it will result in an increased reaction rate. The higher the temperature, the faster the reaction rate will be too. Lowering the temperature, decreasing the amount of reactions, and diluting a solution will decrease the reaction rate

Answer:

having more surface area

Explanation:

The four main parts of a spiral galaxy are the disk, bulge, halo, and the signature arms.

In a spiral galaxy, the rotating disc is surrounded by spiral 'arms' that extend outward from a compact center region. A spiral galaxy is the Milky Way. Galaxies can be divided into four categories: spiral, barred spiral, elliptical, and irregular.

Most spiral galaxies are found in the Universe's low-density regions. They hardly ever appear in the center of galaxy clusters. The Milky Way, our own galaxy, is believed to be a spiral galaxy with a central bar.

The disk, bulge, halo, and distinctive arms are some of the distinguishing characteristics of spiral galaxies. Younger stars are often located in the disk, which emits a bluish tint and is composed of gas and space dust.

Thus, the disk, bulge, halo, and the signature arms are the four main parts of a spiral galaxy.

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Answer:

Plants in the biosphere consume carbon dioxide from the atmosphere and emit oxygen back into the atmosphere as a result of photosynthesis. Animals consume oxygen from the atmosphere and emit carbon dioxide back into the atmosphere as a result of cellular respiration.

Explanation:

edg2020

It should be noted that the Earth has four major subsystems which are the lithosphere (land), hydrosphere (water), atmosphere (air), and biosphere.

The spheres of the Earth influence each other and they interact. For example, rain falls from the cloud in the atmosphere and then falls on the land. This shows that there's an interaction between the hydrosphere, lithosphere, and atmosphere.

Also, plants that are in the biosphere consume carbon dioxide that comes from the atmosphere. The plants then give back oxygen which is used for respiration by the animals and humans.

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Chemical reactivity is the property that describes how easily a substance undergoes chemical changes. It relates to the instability of a substance, with more reactive substances typically being less stable. Factors influencing chemical reactivity include electron configuration, the presence of unpaired electrons, and the substance's position in the Periodic table.

The property that describes how easily a substance undergoes chemical changes is known as chemical reactivity. This reactivity indirectly relates to how unstable the substance is, with less stable substances generally being more reactive. For instance, noble gases like helium or neon are very stable and exhibit low reactivity, while alkali metals like sodium are relatively unstable and show high reactivity.

Chemical reactivity can be influenced by several factors, including the particular substance's electron configuration, the presence of unpaired electrons, and the substance's position in the periodic table. Therefore, understanding a material's chemical reactivity can greatly help predict its behavior in various situations, particularly in reactions.

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A limestone plateau has no surface water. All the water is pulled underground through cracks and crevices in the surface. What most likely will cause the underground of the plateau to change over time?

Physical weathering due to frost wedging

Physical weathering due to abrasion

Chemical weathering due to oxygen

Chemical weathering due to water  Correct Answer

Answer: Chemical weathering due to water. fyi i did the test.

Terrestrial biomes are regions categorized by climatic conditions that define the ecosystems within them. Key factors are temperature and precipitation, which influence the biodiversity, especially the suitability for certain plants and animals. Examples of biomes include grasslands, forests, deserts, and tundra.

The terrestrial biomes of the world include diverse regions with distinct climates and ecosystems. Terrestrial biomes are categorized mainly by climate, which shapes the biodiversity within them. Factors such as temperature and precipitation are crucial in determining the types of plants and animals that can survive in each biome. For instance, in the tundra, the lack of warmth and stable temperatures prevent cold-blooded animals such as amphibians and reptiles from thriving due to their inability to maintain a constant body temperature.

The same type of biome can occur in different geographic locations, provided the climate is similar. Therefore, the worldwide distribution of biomes can be understood by examining patterns of climate across the globe.

i just took the test and its c

After considering the characteristics of seagrass, we find that the seagrass is from the continental shelf and the sunlight zone. Hence, option C is correct.

In order to synthesize, or create, their own food source, plants must consume light energy, hence the name "autotroph." There is a common misconception that when a plant is placed in soil, watered, or exposed to the sun that it is being "fed," although none of these actions are actually regarded to be feeding.

Instead, plants produce glucose, a type of sugar that they require to thrive, using sunshine, water, and gases from the atmosphere. Every plant, every type of algae, and even some bacteria engage in this process, which is known as photosynthesis. Plants require carbon dioxide, water, and sunlight to carry out photosynthesis.

Hence, this concludes that option C is correct.

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