What is the force that opposes motion and can be found anytime two surfaces are in contact?

friction
momentum
net force
spring forces

Answer:

The given statement is true

Explanation:

Injuries are the ones that cut skin, tissues. Injuries include cuts, scratches, scrapes and punctured skin and worst case is fatal.

Normally injury is caused by external force, includes damages done to the body.

Definitely injuries can be prevented if rules are followed, protective equipments are used.  Also in each sport, risks of injuries if known measures can be taken to prevent the injuries

The given statement is true

Injuries can be preventable if you follow the rules, use protective equipment is a true statement.

This is defined as harm to the body and is usually associated with pain, bleeding etc.

This can be avoided when performing sports through using protective equipment and risks involved in the sport.

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We study the motion of the ball on the two coordinating needles Ox and Oy, originated on the ground. On Ox the ball has a uniform straight motion with the velocity vx = vo and the equation of motion is x = vo * t, and on the ball Oy has a movement uniformly accelerated with acceleration g and no initial velocity on the axis Oy v_oy = 0 (free fall), so the equation of motion is y = h-gt² / 2.The equation of the trajectory is obtained by eliminating the time from the two equations. We hold t = x / vo => y = h-gx²/2vo².The trajectory is a parabola because y is a second degree function of x. Bila arrives on the ground when y = 0 => t =√(2h/g)=√(2*100/9.8)=√20.4=4.51 s

The ball will fall towards the rock at a distance d = vo * t =10*4.51≈45 m

The correct answer is e

To determine the amount of heat energy (Q) needed to raise the temperature of 0.90 g of copper from 9°C to 26°C, you would use the formula:

Q = mcΔT
Where:

So, Q = (0.90 g)(0.385 J/g°C)(26°C - 9°C)

By calculating the change in temperature (26°C - 9°C = 17°C) and plugging in the values, we get:
Q = (0.90)(0.385)(17)
Q = 5.8725 J

Therefore, it would take 5.8725 J of heat to raise the temperature of 0.90 g of copper from 9°C to 26°C.

The answer is; white dwarf

A white dwarf is created from a red giant. As the outer shells of the red giant overcome it the gravitational influence of its core, the plumes of the shells escape into outer space as planetary nebulae leaving behind a small dense and bright spot called a white dwarf as a remnant.  

First, note that a circle has a measurement of 360°.

Note that there are 70 people in all. First, divide 360 with 70

360/70 = ~5.14

Each person's "favorite choice" would be 5.14° of a circle.

Now, solve for honey mustard. There are 10 people who chose honey mustard, so multiply the number above by 10.

5.14 x 10 = 51.4

D. 51.4° is your answer

~

Answer:

51.4

Explanation:

The vector that goes from (0,0) to (1,-3) can be found by subtracting the initial point (0,0) from the terminal point (1,-3). So, the vector that goes from (0,0) to (1,-3) is (1, -3).

The vector that goes from (0,0) to (1,-3) can be obtained by subtracting the initial point (0,0) from the final point (1,-3). The x-component of the vector is the difference in x-coordinates: 1 - 0 = 1.

The y-component of the vector is the difference in y-coordinates: -3 - 0 = -3.

Therefore, the vector that goes from (0,0) to (1,-3) is represented as (1, -3) in the form of (x-component, y-component). Visually, the vector (1, -3) points from the origin (0,0) in the positive x-direction (to the right) by a distance of 1 unit and in the negative y-direction (downward) by a distance of 3 units.

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If your atom has a charge of +1, it means you have 1 more proton than electrons. This is because protons have a positive charge and electrons have a negative charge. Because you have 23 protons, and a charge of +1, you have 22 electrons.

Hippocampus and prefrontal cortex

heat being supplied might do

2. Osmosis is the process by which a solvent (water) moves through a semipermeable membrane into a solution with higher solute concentration from a solution with a lower solute concentration.

3. Diffusion is the process by which a solvent (water) moves from an area with higher concentration to an area of lower concentration.

(for one and 2 the first one is more wordy and with more scientific words but you can sub the words into either one to make it more or less wordy)

3. Animalia, Plantea, Fungi, and Protista. Protista cannot be classified as an animal, plant, or fungus.

4. Organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

5. I don't have the organelles to identify.

7. Taxonomy is the branch of science with classification, especially of organisms. Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.

8. I'm not sure about the first question. Scientists name plants and animals using a system that describes the genus and species of an organism.

I did the best I could answering I really hope this helps!!

Answer:

empty space

Explanation:

V = speed of the plane with no wind = 250 mph

v  = speed of wind

consider the motion of the plane while traveling with the wind :

V' = speed of plane travelling in the direction of wind = V + v = 250 + v

d' = distance traveled = 300 miles

t' = time taken to travel the distance

time taken to travel the distance is given as

t' = d'/V'

t' = 300/(250 + v)                                           eq-1

consider the motion of the plane while traveling against the wind :

V'' = speed of plane travelling against the direction of wind = V - v = 250 - v

d'' = distance traveled = 200 miles

t'' = time taken to travel the distance

time taken to travel the distance is given as

t'' = d''/V''

t'' = 200/(250 - v)                                           eq-2

Given that :

time taken to travel 300 miles = time taken to travel 200 miles

t' = t''

using eq-1  and eq-2

300/(250 + v)  = 200/(250 - v)

3/(250 + v)  = 2/(250 - v)

750 - 3 v = 500 + 2 v

5 v = 250

v = 50 mph

The question seeks to determine values related to centripetal acceleration and other quantities in uniform circular motion, requiring application of principles from circular dynamics. Calculation specifics, however, demand additional information or clarification for accurate resolution.

The question pertains to determining specific quantities related to an object undergoing uniform circular motion. Given are the period T = 2.0 s, radius r = 3.00 m, and a centripetal acceleration vector a = (6.00 m/s2)i + (-4.00 m/s2)j at a certain instant. To resolve this, it's essential to understand that centripetal acceleration points towards the center of the circular path, and its magnitude in circular motion is given by ac = v2/r or implicitly through ac = 4π2r/T2, whereby v is the velocity of the object and T is the period of motion.

Part (a) involves finding v parallel to a, which cannot be directly inferred from the provided acceleration vector without additional context on the motion's direction. Part (b) requests the calculation of r cross a (r×a), a vector product that depends critically on both the magnitude and angle between the radius vector r and acceleration vector a, necessitating further geometric interpretation or additional information to solve accurately.

Final answer:

The final answers are: (a) [tex]\( v \cdot a = 0 \, \text{m}^2/\text{s}^3 \)[/tex] (b) [tex]\( r \cdot a = -4.00 \, \text{m}^2/\text{s}^2 \)[/tex]

Explanation:

- [tex]Period \( T = 4.30 \, \text{s} \)[/tex]

- [tex]Radius \( r = 3.00 \, \text{m} \)[/tex]

-[tex]Acceleration \( a = (5.00 \, \text{m/s}^2) \mathbf{i} + (-4.00 \, \text{m/s}^2) \mathbf{j} \)[/tex]

Calculate the velocity  v  using the formula for uniform circular motion:

[tex]\[ v = \frac{2 \pi r}{T} \][/tex]

Substitute the given values:

[tex]\[ v = \frac{2 \pi \times 3.00 \, \text{m}}{4.30 \, \text{s}} \approx 4.39 \, \text{m/s} \][/tex]

Calculate the dot product [tex]\( v \cdot a \):[/tex]

[tex]\[ v \cdot a = (v_x \cdot a_x) + (v_y \cdot a_y) \][/tex]

Where [tex]\( v_x \)[/tex] and [tex]\( v_y \)[/tex] are the x and y components of velocity, and [tex]\( a_x \)[/tex] and [tex]\( a_y \)[/tex] are the x and y components of acceleration. In this case, [tex]\( v_x = 0 \)[/tex] because the motion is in a circle, so [tex]\( v_y = 4.39 \, \text{m/s} \).[/tex]

[tex]\[ v \cdot a = (0 \cdot 5.00) + (4.39 \cdot (-4.00)) = 0 \, \text{m}^2/\text{s}^3 \][/tex]

Calculate the dot product [tex]\( r \cdot a \):[/tex]

[tex]\[ r \cdot a = (r_x \cdot a_x) + (r_y \cdot a_y) \][/tex]

Where [tex]\( r_x \)[/tex] and [tex]\( r_y \)[/tex] are the x and y components of the radius vector, and [tex]\( a_x \)[/tex] and [tex]\( a_y \)[/tex] are the x and y components of acceleration. In this case, [tex]\( r_x = 0 \)[/tex] because the motion is in a circle, so [tex]\( r_y = 3.00 \, \text{m} \).[/tex]

[tex]\[ r \cdot a = (0 \cdot 5.00) + (3.00 \cdot (-4.00)) = -4.00 \, \text{m}^2/\text{s}^2 \][/tex]

Complete question:

A centripetal-acceleration addict rides in uniform circular motion with period T = 4.30 s and radius r = 3.00 m. At one instant his acceleration is a = (5.00 m/s2) + (-4.00 m/s2) . At that instant, what are the following values? (a) v·a (b) r a

Sally's displacement (5m forward) is 10m less than her distance traveled (15m).  (B)

Answer:

Sally's displacement is 10 m less than her distance traveled.  

Explanation:

It is given that, Sally walks 10 meters forward and then 5 meters backwards. The total path covered by a particle is called total distance covered by it and the shortest path covered by it is called its displacement.

From the attached figure, A is the initial position of Sally. Initially, he moves from A to B. It covers a distance of 10 m then he moves from B to C. So, the total distance covered by Sally is AB+BC = 15 m

While her displacement is AC i.e. 5 m

So, the correct option is (b) i.e. her displacement is 10 m less than her distance travelled.

The main goal of science is to learn about the universe and the laws of nature. (B)

The goal of Applied Science, Technology, and Engineering is to develop new inventions and processes (D), that can use the laws of nature to benefit humans. (A)

Answer:

C

Explanation:

Answer:

The heat builds pressure

Explanation:

Consider an ideal gas in a closed system (like a gas in a container: in this case, the volume of the gas is fixed). The ideal gas equation states that:

[tex]pV=nRT[/tex]

where

p is the gas pressure

V is the gas volume

n is the number of moles of the gas

R is the gas constant

T is the gas temperature

If heat is added to the gas, its temperature T increases. n and R are constant, and V is constant as well (the container does not change its volume), so this means that the pressure of the gas, p, increases as well. The more heat is added, the more the temperature increases, the more the pressure increase: at some point, the pressure against the internal walls of the container will become so strong that the container will explode.

A. heat builds pressure.

Answer:

period in case 2 is [tex]\sqrt{2}[/tex] times the period in case 1

Explanation:

The period of oscillation of a spring is given by:

[tex]T=2 \pi \sqrt{\frac{m}{k}}[/tex]

where

m is the mass hanging on the spring

k is the spring constant

Therefore, in order to compare the period of the two springs, we need to find their m/k ratio.

We know that when a mass hang on a spring, the weight of the mass corresponds to the elastic force that stretches the spring by a certain amplitude A:

[tex]mg = kA[/tex]

So we find

[tex]\frac{m}{k}=\frac{A}{g}[/tex]

The problem tells us that the amplitude of case 1 is d, while the amplitude in case 2 is 2d. So we can write:

- for case 1:

[tex]\frac{m}{k}=\frac{d}{g}[/tex]

[tex]T_1=2\pi \sqrt{\frac{d}{g}}[/tex]

- for case 2:

[tex]\frac{m}{k}=\frac{2d}{g}[/tex]

[tex]T_2=2\pi \sqrt{\frac{2d}{g}}[/tex]

And by comparing the two periods, we find:

[tex]\frac{T_2}{T_1}= \sqrt{2}[/tex]

So, the period of oscillation in case 2 is [tex]\sqrt{2}[/tex] times the period of oscillation in case 1.

The aspect not part of John Dalton's atomic theory is 'Atoms are made up of smaller particles.' Dalton's postulates did not acknowledge subatomic particles as he viewed atoms as indivisible and the smallest particles.

Within John Dalton's atomic theory, several postulates outline his early understanding of the atomic structure. Based on the provided excerpts, the answer to which is not part of John Dalton's atomic theory is d. Atoms are made up of smaller particles.

Dalton's theory emphasized the indivisibility of atoms; he considered atoms as the smallest, indivisible particles and did not acknowledge that atoms could be split into subatomic particles such as protons, neutrons, and electrons. This contrasts with modern understanding, which recognizes that atoms indeed consist of smaller subatomic particles, but during Dalton's time, such knowledge had not yet been discovered.

The first two postulates of Dalton's atomic theory correctly state:

However, subsequent scientific discoveries have shown that even these points have exceptions, such as the existence of isotopes with different masses within a single element.

normal force is the opposite of gravity

The Normal Force is the force that acts opposite to gravity, equalizing the weight of an object resting on a horizontal surface to prevent it from falling.

In terms of basic Physics, the force that acts opposite to gravity is the Normal Force. To better understand this, imagine a book resting on a table. Here, gravity pulls the book down towards the center of the Earth, while the table exerts an upward force on the book, equivalent to the book's weight, to prevent it from falling. This upward force is known as the normal force. It's important to note, the normal force only counters gravity when the object is on a horizontal surface.

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A; They are moving away from us at high speed.

Provided the dots represent time-lapse snapshots of an object's motion from left to right, then

(a) The underlying object is slowing down because the distance between adjacent snapshots (dots) decreases with time

(the answer is intentionally reworded to avoid sounding nonsensical)

The answer is B or A im pretty sure its B thou

The measurement consists in comparing a selected pattern with the object or phenomenon whose physical magnitude is going to be measured, to find out how many times the pattern is contained in that magnitude. That is, it is about identifying or quantifying a particular characteristic or aspect of a particular object or construct.

Now, a well done measurement has two parts:

-The number gives us information about the quantity of the measurement, or in other words, the magnitude of the measurement and its precision.  

-The units gives us information about the property that is being measured. This is quite important, because a measurement or result with no units is useless.

Note the units may be expressed with letter or symbols, depending on what we are measuring.

A measurement consists of two important parts: a number and a unit. The number provides the quantity, and the unit indicates the standard of measure.

The two parts of a measurement are a number and a unit. For example, if you measure the length of a desk and find it to be 150 cm, '150' is the number, and 'cm' or centimeters is the unit.

The number tells you 'how much', and the unit tells you 'of what'. '150 centimeters' means 150 times the defined length of a centimeter.

Each part is necessary for the measurement to make sense and be useful. Without the number, you wouldn't know 'how much', and without the unit, you wouldn't know 'of what'.

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Answer:

The correct answer is 6.25 km per hour due east.

Explanation:

We are given that a horse is running due East and covers a distance of 25 kilometers in a time period of 4 hours and we are supposed to find its velocity.

The formula of velocity is similar to speed which is the ration of distance and time.

Velocity = distance / time

So putting in the given values to find the velocity of the horse:

V = 25 / 4

V = 6.25 km / hour

I think neon because it is all the way to the right

Answer:

option (D)

Explanation:

The elementary particles of atom are protons, neutrons and electrons. The protons and neutrons are residing in the nucleus and electron revolves around the nucleus in fixed stationary orbits.

The mass of proton and a neutron is almost same and equal to 1.67 x 10^-27 Kg.

The mass of an electron is 9.1 x 10^-31 Kg.

The mass of electron is much less than the mass of proton or a neutron.

Proton is 1837 times heavier than the electron.

Taking into account the constitution of an atom, the correct answer is option d. an electron has far less mass than either a proton or a neutron.

The smallest component of ordinary matter with the characteristics of a chemical element is an atom. Every atom consists of a nucleus in which neutrons and protons meet, and energy levels where electrons are located.

In other words, protons and neutrons constitute the atomic nucleus, the central part of the atom, whereas electrons are present in the orbitals, or peripheral region.

The neutron is an electrically neutral subatomic particle, while the proton has a positive electrical charge. Electrons have a negative charge, move around the nucleus at different energy levels and are attracted to protons, positive in the atom through electromagnetic force. The mass of an electron is almost 2000 times smaller than that of the proton and neutron.

In summary, an electron has far less mass than either a proton or a neutron.

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A 'vector' is a measurement that has a magnitude and a direction.

For the vector given here, "15 ft/s" is the magnitude, and "down" is the direction.

The magnitude of the vector described below "15 ft/s down" is 15 ft/s. The correct option is A.

A vector is the representation of a physical quantity in magnitude and direction.

For the given, "15 ft/s down" representing both the magnitude and direction.

The magnitude is 15 ft/s.

Thus, the correct option is A.

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Final answer:

The correct answer is option b as it reflects Newton's second law, stating that a constant acceleration implies a net external force. The other options misrepresent the relationship between forces, mass, acceleration, and motion.

Explanation:

The correct statement related to the motion of objects according to Newton's laws is b. An object moving with constant acceleration always has a net force acting on it. This is because Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. In other words, if there is acceleration, there must be a net force causing it.

Option a is incorrect because if an object moves at a constant velocity, there is no net force acting on it as per Newton's first law of motion. Option c is incorrect as it states a relationship between mass and acceleration that is not linear; instead, mass is inversely proportional to acceleration. Lastly, option d incorrectly describes Newton's second law; the net force on an object is equal to the mass of the object multiplied by the acceleration (Fnet = ma).

Answer: All apply

The periodic table is an arrangement of the chemical elements in the form of a table, ordered by:

-Their atomic number (number of protons)

-Their configuration of electrons

-Their chemical properties

It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.

Its usefulness lies in the fact that it allows the existing elements to be organized in a more structured and coherent way, according to the chemical properties they possess. Dividing the table into rows and columns, which represent the periods and groups or families.

Then, with the location and classification of an element according to its group, we can determine how it acts by knowing its chemical and physical characteristics.

This is how with this configuration can be distinguished 4 sets of chemical elements, according to the ease of their atoms to lose or gain electrons, transforming into ions: metals, semimetals, non-metals and noble gases.

This has helped to predict the existence of various elements that have not yet been discovered, because by elements already located in the table and the periodicity found, there are still empty spaces that indicate the composition of the element that has not yet been found.

In addition, this table helps to simplify in some way the teaching of chemical elements and facilitates their learning, as well as their usage in the development of technological innovations.

The periodic table has greatly benefited society by providing a structured framework for scientists to communicate discoveries, predict and discover new elements, and innovate in technology, particularly in the field of electronics.

Since its creation in the mid-1800s, the periodic table has been instrumental in advancing both scientific understanding and practical applications. One of the key benefits is that it has enabled scientists to communicate chemical discoveries and results more easily, providing a universal language and structure for chemists around the world. Additionally, the periodic table has been crucial in increasing scientists' ability to predict and discover new elements. Through the recognition of patterns and periodic trends, scientists have been able to infer the existence of elements before they were discovered. Furthermore, the periodic table has paved the way for revolutionary developments in technology. It has led to increased knowledge and usage of elements in technological innovations, such as the use of silicon in semiconductors, which are fundamental to today's electronic devices.

Although the periodic table does not directly increase the ability to determine how cations and anions form covalent bonds, since covalent bonds typically involve non-charged atoms, the understanding of periodic trends and properties of elements, e.g., electronegativity and valency, contribute to a better comprehension of chemical bonding in general. It is the insightful organization of elements that allows scientists and engineers to grasp the properties of elements and their compounds, leading to the development and refinement of myriad materials and technologies.