someone please help on this one?

Answer:

cohesion

Explanation:

Essentially, cohesion and adhesion are the "stickiness" that water molecules have for each other and for other substances. You can see this in the picture of pine needles. The water drop is composed of water molecules that like to stick together, an example of the property of cohesion.

The tendency of water molecules to stick together with each other is known as cohesion.

Anything which has mass to keep the same when comparing the hardness of the solid and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.

These different states of matter have different characteristics according to which they vary their volume and shape.

Water belongs to the liquid state of matter which has many inherent properties, one of them is the cohesive nature of the water.

Cohesion is the property of the substance by which similar particles stick with each other while adhesion is the property by which molecules of different materials stick with each other.

The formation of the water droplets is one of the best examples to understand the cohesion property of the materials, while the sticking of mercury molecules on the surface of the glass demonstrates the adhesion property of materials.

Thus, the tendency of water molecules to stick together is referred to as cohesion.

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Answer:

Copper

Explanation:

Copper is the most popular material used for wires because it is a quality conductor of electrical current

Answer:

A. Lever

Explanation:

A  Lever is the kind of simple machine is the shin bone in your leg.

Hope this helps!

Feel free to ask if you have anymore questions!

The shin bone in your leg, also known as the tibia, acts like a lever in the context of simple machines. It helps create movement, with muscles providing the force, and joints serving as fulcrums.

The shin bone in your leg, also known as the tibia, is similar to a lever in the context of simple machines. In our bodies, bones, muscles, and joints work together to create movement. Muscles exert force, bones act as levers, and joints act as fulcrums. For instance, when you kick a ball, your shin bone acts as the lever; the joint at your knee serves as the fulcrum; and the muscles in your thigh and calf provide the force.

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Answer:

D

Explanation:

m = -di/do

Given:

di = 10.0 cm

do = 50.0 cm

Find: m

m = -(10.0) / (50.0)

m = -0.200

The magnification of a real image is -0.20

Image from a mirror = 10 cm

Object from the mirror = 50 cm

        The process of enlarging the apparent size of the object is called

magnification.

Here, the formula is given as

                             m = - di / d₀

   m - magnification

   di - distance of the image

   do - distance of the object

                             m = - 10 / 50

                                 =  - 0.20

Hence, Option D is the correct answer.

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Convective heat transfer occurs only in fluids, through the movement of groups of molecules that make up the medium.

Being this molecular movement, related to the properties of the fluid that change with temperature.

This means that convection occurs when the hottest parts of a fluid ascend to the coldest zones, generating a continuous circulation of the fluid (better known as convective current) transmitting heat to the cold zones by decreasing the density caused by the increase in temperature.

Convection, a method of energy transfer, is predominantly restricted to fluids (liquids and gases), as it depends on particle movement and density changes that cause a circulatory motion, facilitating heat transfer.

Energy transfer by convection is primarily restricted to fluids, which includes both liquids and gases. This is due to the fact that convection relies on the movement of particles within a substance. More specifically, convection occurs when warmer, less dense parts of a fluid rise, displacing cooler, denser parts which sink. This creates a circular motion of fluid, known as a convective current, and allows for heat to be distributed throughout the whole fluid.

Examples of convection include a boiling pot of water where the hot water at the bottom rises to the top, or the warmth you feel when standing near a radiator. The warm air around the radiator rises and circulates around the room, spreading heat.

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Answer:

B. +m

Explanation:

The magnification of an image is defined as the ratio between the size of the image and of the object:

[tex]m = \frac{y'}{y}[/tex]

where we have

y' = size of the image

y = size of the object

There are two possible situations:

- When m is positive, y' has same sign as y: this means that the image image is upright

- When m is negative, y' has opposite sign to y: this means that the image is upside down

Therefore, the correct option representing an upright image is

B. +m

Final answer:

In optics, a positive magnification represents an upright image. Option B: +m represents an upright image.

Explanation:

In optics, an upright image is represented by a positive magnification (+m). When the magnification is positive, it indicates that the image is upright, meaning it has the same orientation as the object.

For the options given, option B: +m represents an upright image.

A positive magnification (+m) indicates that the image is upright. On the other hand, the distance from the object to the mirror or lens (often represented by do or d₁), is concerned with the real versus virtual nature of the image; the sign does not directly indicate the image's orientation. Based on this, the answer which represents an upright image is B. +m.

Final answer:

If the Earth had the density of a nucleus, its radius would be only about 200 meters compared to the actual radius of approximately 6.4 x 10^6 meters.

Explanation:

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10-15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10-10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth's density were equal to the average nuclear density, the earth's radius would be only about 200 meters (earth's actual radius is approximately 6.4 x 106 meters, 30,000 times larger).

Answer:

3 electrons

Explanation:

Lithium is the third element of the periodic table, so its atomic number is 3:

Z = 3

This means that an atom of lithium contains 3 protons. Moreover, for a neutral atom the number of protons in the nucleus is equal to the number of electrons: this means that an atom of lithium contains 3 electrons as well.

In this specific case, we have an isotope of Lithium-6 (6Li), which has a mass number of 6:

A = 6

This means that the atom contains 6 protons+neutrons in the nucleus, so it contains 6-3 = 3 neutrons.

Answer:

Circle or pie graph is used to show how a part of something relates to the whole.

Explanation:

Pie graphs are easy to read and can present a very clear picture of the relationships.

Question:

The type of graph used to show how a part of something relates to the whole is which of the following? a. circle graph b. bar graph c. line graph d. direct proportion

Answer:

The type of graph used to show how a part of something relates to the whole is circle graph.

Explanation:

Circle graph also denoted as pie chart. It is generally used to show data analyzed in a small group. The circle graph is made in different parts based on the difference in the properties of the sample. It generally shows the relative analysis of each property for a given set of samples.

So, each parts in the circle graph will tell us the percentage of a property among the other properties present in the sample. Like we can say, if in a class of 100 students, 25 students are girls and 75 students are boys can be drawn in circle graph with two parts having smaller area for girl students and bigger area parts for boy students.

The existence of Earth's seasons is explained by the tilt of Earth's axis and its orbit around the Sun.

The existence of Earth's seasons is explained by two characteristics of Earth's relationship to the Sun. First, Earth's axis is tilted relative to its orbital plane. This tilt causes different parts of Earth to receive different amounts of sunlight throughout the year, creating the seasons. Second, Earth orbits around the Sun, completing one orbit each year. As Earth moves in its orbit, different parts of the planet are tilted toward or away from the Sun, resulting in the changing seasons.

Final answer:

The existence of Earth's seasons is primarily due to Earth's axis being tilted relative to its orbital plane and Earth completing one orbit around the Sun each year.

Explanation:

The existence of Earth's seasons can be explained by the following characteristics of Earth's relationship to the Sun:

Earth orbits around the Sun, completing one orbit each year.

These two factors combined explain why different parts of Earth receive varying amounts of sunlight throughout the year, resulting in seasons. The tilt of the Earth's axis ensures that at different times of the year, either the Northern or Southern Hemisphere will be tilted towards the Sun, receiving more direct sunlight and experiencing summer, while the other hemisphere will be tilted away, receiving less direct sunlight and experiencing winter.

Earth's rotation on its axis, which occurs once a day, simply provides the cycle of day and night, and its axis always pointing in the same direction relative to the stars, ensures consistency in the orientation of Earth's tilt as it orbits the Sun.

Answer:

the universe began at a single point and has been expanding since its formation

The statement best describes the big bang theory is the universe began at a single point and has been expanding since its formation. The correct option is D.

The big bang is the theory which explains that how the universe began. It says that the universe began with just a single point. It went on expanding and stretched to grow as large as possible. It is still now expanding.

The big bang consist of fully dark matter, interstellar gases or dust. The big bang is increasing just because in universe there is abundant of hydrogen and helium.

The radiations come from the big bang.  These rays are also called as cosmic wave. This big bang is still on it way of expanding more.

Thus, the statement best describes the big bang theory is the universe began at a single point and has been expanding since its formation.

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79 m/s. A stone dropped from the top of the Empire State Building will have a velocity of 79 m/s just before it strikes the ground.

This problem is about free fall, to find the velocity of the stone before it strikes the ground we have to use the equation [tex]v_{f}^{2}=v_{0}^{2}+2gh[/tex], the initial velocity  of the stone is 0 m/s. Then:

[tex]v_{f}^{2}=2gh[/tex]

[tex]v_{f}=\sqrt{ 2gh}[/tex]

Solving the equation above with g = 9.8 m/s², and h = 318.0 m:

[tex]v_{f}=\sqrt{ 2(9.8m/s^{2})(318.0m)}= 78.95 m/s[/tex]

[tex]v_{f}[/tex]≅ 79 m/s

It doesn't matter whether the capacitor happens to be charged or not.  It can be charged to 1/2 volt, or it can be charged to 1 thousand volts, or it can be totally uncharged and wrapped in tissue in a box on the shelf.  None of that has any effect on its capacitance.  Whatever capacitance it has, that's what it has.

In order to increase its capacitance, you would have to . . .

-- increase the area of the plates,

or

-- move the plates closer together,

or

-- fill the space between the plates with a substance that has a greater dielectric constant than air has.

The capacitance of an air-filled capacitor can be increased by reducing the distance between plates, increasing their surface area, or using a material with a higher dielectric constant in place of air.

In physics, the capacitance of an air-filled charged capacitor can be increased by three main ways: reducing the distance between the plates, increasing the surface area of the plates, and using a material with a higher dielectric constant in place of air.

Reducing the distance between the plates increases the electric field between the plates, so more charge can be stored. Increasing the surface area of the plates provides more space for charge to accumulate, thereby increasing the capacitance. Using a dielectric material with a higher dielectric constant than air in between the plates can also enhance the capacitor's ability to store charge.

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Answer:

12

Explanation:

(6 x 1) 2

Explanation:

The acceleration due gravity (free-fall acceleration) [tex]g=[/tex] of a body is given by the following formula:

[tex]g=\frac{GM}{r^{2}}[/tex]   (1)

Where:

[tex]G=6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}[/tex] is the gravitational constant

[tex]M[/tex] the mass of the body (the moon in this case)

[tex]r[/tex] is the distance from the center of mass of the body to its surface. Assuming the moon is a sphere with a diameter [tex]d=3500km[/tex], its radius is [tex]r=\frac{d}{2}=1750km=1750(10)^{3}m [/tex]

If the value of [tex]g[/tex] is given: [tex]g=1.60m/s^{2}[/tex] we can find the mass of the moon with equation (1):

[tex]M=\frac{gr^{2}}{G}[/tex]   (2)

[tex]M=\frac{(1.60m/s^{2})(1750(10)^{3}m)^{2}}{6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}}[/tex]   (3)

[tex]M=7.34(10)^{22}kg[/tex]   (4)

Now, according to the 3rd Kepler's Law, there is a relation between the orbital period [tex]T[/tex] of a body (the spacecraft in this case) orbiting a greater body (the moon) in space with the size [tex]r[/tex] of its orbit.

[tex]T^{2}=\frac{4\pi^{2}}{GM}r^{3}[/tex]    (5)

Substituting the known values and the calculated mass of the moon in (6), we can find the period of the orbit of the spacecraft around the moon:

[tex]T=\sqrt{\frac{4\pi^{2}}{GM}r^{3}}[/tex]    (6)

[tex]T=\sqrt{\frac{4\pi^{2}}{(6.674(10)^{-11}\frac{m^{3}}{kgs^{2}})(7.34(10)^{22}kg)}(1750(10)^{3}m)^{3}}[/tex]   (7)

Finally:

[tex]T=6571.37619s=109.522 min[/tex]  

Given the moon's diameter and the acceleration due to gravity at its surface, a spacecraft in low, circular orbits roughly 115.2 minutes to complete one orbit, using the equations of circular motion.

To calculate the time it takes for the spacecraft to complete one orbit, you need to know the speed of the craft, which is determined by the gravitational force between the Moon and the spacecraft. This force creates the centripetal acceleration that keeps the spacecraft in its circular orbit.

The formula to calculate the speed (v) in a circular orbit is v =  √(g*r), where g is the acceleration due to gravity (1.6 m/s^2) and r is the radius of the orbit. Because the spacecraft is very close to the lunar surface, the radius is approximately the radius of the moon, which is 1.75 x 10^6 m (half the diameter).

Then, the orbital period (time for one complete orbit) can be calculated using the formula T = 2πr/v. Substituting known values and calculating, it takes approximately 1.92 hours, or 115.2 minutes, for the spacecraft to complete one orbit.

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Answer: Southern Summer Solstice

Explanation:

Solstices are astronomical events that occur twice a year (June and December), in which the Sun reaches its highest or lowest apparent height in the sky, and the duration of the day or night are the maximum of the year, respectively. This is because the Sun reaches the maximum north or south declination with respect to the terrestrial equator.  

In this case we will talk about the december solstice in the southern hemisphere, which occurs regularly around December 21st and marks the beginning of summer in this hemisphere and the beginning of winter in the northern hemisphere.  

During this season of the year the days are longer than the nights, and as we get closer to the South Pole, we will have more hours of sunlight.

1) The total amount of energy in the universe remains constant.

4) Energy can be converted from one form to another.

5) Energy cannot be created or destroyed.

Best describes energy

Law of conservation of energy is the principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant.

Total energy of any system always remains  constant . Also from law of conservation of energy it can be stated as energy can neither be created nor be destroyed ,it only transforms form one form to other form .

hence , option 1) : The total amount of energy in the universe remains constant.

4) Energy can be converted from one form to another.

5) Energy cannot be created or destroyed.

Best describes energy

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Answer:

1, 3, 4, 5

Explanation:

took on edge

The evidence supporting the wave model of light is its ability to travel fastest through a vacuum. This property is due to its wave nature, which allows it to propagate without needing a medium.

The piece of evidence that supports the wave model of light is that light travels fastest through a vacuum. This is because, according to wave theory, light is a type of electromagnetic wave that doesn't need a medium to propagate, thus it can travel through empty space (a vacuum) at its highest speed, approximately 299,792 kilometers per second. Other properties such as reflection or causing electrons to be released from a metal surface also occur, but they can be explained by both wave and particle models.

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Light reflects when it hits a surface, which supports the model of light as a wave. correct answer is 2. Light reflects when it hits a surface.

Light is known to exhibit a dual wave-particle nature. Light as a wave is supported by phenomena such as interference and diffraction.

Of the given choices, the piece of evidence that supports the model of light as a wave is that light reflects when it hits a surface. Reflection is a behavior consistent with wave theory because waves can bounce off surfaces.

This behavior is explained by wave theory, demonstrating light's dual wave-particle nature. Interference and diffraction are additional examples supporting light's wave-like properties.

complete question:

Light is described as having a dual wave-particle nature. Which piece of evidence provides support for the model of light as a wave?

Answer:

161.7 m/s

Explanation:

The kinetic energy of the car is given by

[tex]K=\frac{1}{2}mv^2[/tex]

where

m = 1650 kg is the mass of the car

v = 38.0 m/s is the speed

Substituting,

[tex]K=\frac{1}{2}(1650 kg)(38.0 m/s)^2=1.19\cdot 10^6 J[/tex]

The bycicle + rider has the same kinetic energy; moreover, their combined mass is

m = 91.0 kg

So, the speed of the bike should be

[tex]v=\sqrt{\frac{2K}{m}}=\sqrt{\frac{2(1.19\cdot 10^6 J)}{91.0 kg}}=161.7 m/s[/tex]

Bicycle has a speed of 161.7 m/sec.

Given :

Mass of car = 1650 Kg

Speed = 38 m/sec

Mass of bicycle = 91 Kg

Bicycle and car travelling have same Kinetic Energy.

Solution :

Kinetic energy of the car is,

[tex]\rm KE = \dfrac{1}{2}mv^2[/tex]

[tex]\rm KE = \dfrac{1}{2}\times 1650 \times 38[/tex]

[tex]\rm KE_c_a_r = 1.19\times 10^6\; J[/tex]

Given that both have same kinetic energy. Therefore,

[tex]\rm KE_c_a_r = KE_b_i_c_y_c_l_e[/tex]

[tex]\rm 1.19\times10^6 = \dfrac{1}{2}\times91\times u^2[/tex]

[tex]\rm u = 161.7 \; m/sec[/tex]

Bicycle has a speed of 161.7 m/sec.

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Hello There!

The law of conservation of mass states that Matter/substances/energy  can not be created or destroyed, it can only be transferred from state to state.

Answer:

D

Explanation:

A hypothesis is pretty much what you think something is, what you think the solution is, with the little information that you already have. this can go on to be tested

Final answer:

Correct answer is option D. A hypothesis is a testable proposed explanation for a phenomenon, capable of being supported or refuted by scientific experiments or observations.

Explanation:

Within the realm of science, a hypothesis is a suggested explanation for a phenomenon that is based on evidence and can be tested through observation and experimentation. The key aspect of a hypothesis is its ability to be supported or refuted by experimental data.

So, the correct statement that describes a hypothesis is that it is directly testable (D). Contrary to a hypothesis that cannot be tested, which would not be a scientific hypothesis, a valid hypothesis must allow for the design of experiments or observations that could potentially demonstrate it to be false.

Answer:

Much of the caloric intake is used to maintain normal body functioning -- heart rate, respiration, muscle contraction, etc..  Therefore, only some of the calories are actually stored as fuel for later use.

Explanation:

In the question, there is a comment to indicate that 2,000 of low-carbohydrate food will not cause weight gain.  This is not exactly accurate.  Weight gain depends upon what is taken in (calories in food) and what is expended (calories in activity).

There has to be moderation in what is consumed.  Consuming all fats or all carbs is not the answer.  Yes, fat has more calories per gram (9) than does carbohydrates (4.5), but it should be noted that if you take in too many calories in carbs, they will be converted and stored as fat.

Answer:

Explanation:

I suppose it has to do with the way the diagram is drawn. The heat does not reflect which makes both A and B incorrect.

C would have nothing to do with either reflection or refraction.

That only leaves D which is the answer.

Physical weathering refers to the process of rocks breaking down due to external conditions like temperature and water, without their chemical composition being altered. Examples include temperature changes causing cracks in rocks, and water freezing in rock cracks leading to their breakage.

Physical weathering, also known as mechanical weathering, is a concept in geography that describes the process of rocks breaking down into smaller pieces due to external conditions, without any change in their chemical composition. This occurs primarily due to temperature changes, water, wind, and biological activity.

For example, in the case of temperature changes, the rock can expand and contract causing it to crack and eventually break apart. This is often seen in desert environments where there is a large temperature difference between day and night. Similarly, water, when it gets into the cracks of the rock and freezes, expands, causing the rock to break apart. This process is known as freeze-thaw weathering and is commonly found in cold climates.

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Physical weathering is the process of breaking down rocks into smaller pieces by physical forces like temperature changes and erosion, without any change in the rock's chemical composition. Factors like climate and biotic activity can significantly influence the rate and extent of physical weathering.

Physical weathering, also known as mechanical weathering, is a geological process where rock is broken down into smaller pieces by mechanical means, without any change in the chemical composition of the rock. This can occur through a variety of processes, including temperature changes, wind, water erosion, and biological activity. An example of physical weathering could be the process by which a mountain range is eroded by water and ice: the rocks are not chemically altered, but they are gradually worn down into smaller pieces due to the abrasive action of the moving water and ice.

Another important factor in physical weathering is the climate. Higher temperatures cause rocks to expand, and cooler temperatures cause them to contract. This expansion and contraction can cause stress in the rock that leads to cracking and breaking. Also, in areas of high moisture, water can seep into cracks in rocks and freeze, causing the cracks to widen and the rock to break.

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Answer:

The water molecules attract one another due to the water's polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen cause water to "stick" together. This is why there is surface tension and takes a certain amount of energy to break these intermolecular bonds.

Explanation:

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Answer:

J. Robert Oppenheimer

Explanation:

He led the Manhattan project and created the first nuclear bomb in WWII

Final answer:

J. Robert Oppenheimer is considered the 'father of the atomic bomb' for his leadership of the Manhattan Project, which developed the first nuclear weapons during World War II.

Explanation:

The scientist often called the “father of the atomic bomb” is J. Robert Oppenheimer because of his pivotal role as the head of the Manhattan Project. Oppenheimer was a leading theoretical physicist who, after seeing the power of the bomb, opposed the subsequent nuclear arms race. The Manhattan Project was a top-secret research and development project during World War II that produced the first nuclear weapons. Employing over 100,000 people, this project led to the successful detonation of the world's first atomic explosion in July 1945. Despite his involvement in the development of nuclear weapons, Oppenheimer had complicated feelings about their use and later became a proponent of controlling nuclear arms.

The decision to drop the atomic bomb was influenced by various complex factors, including the desire to bring a swift end to World War II and the fear that Nazi Germany might develop a bomb first, spurred by alarmed messages from scientists like Albert Einstein and Leo Szilard to President Roosevelt.

Answer:

It'll be, C.) equal in measure.

The law of reflection states that the angle of incidence and the angle of reflection are always C: equal in measure.

Incoming rays, normal rays, and reflected rays are all in the same plane. Changing the direction of the incident ray changes the angle of the plane. Again, the incident, normal, and reflected rays are all in the same plane.

Set of optics: When light hits a flat surface, it is reflected so that the angle of reflection is equal to the angle of incidence, placing incident, reflected, and vertical rays on the surface. ..

Law of light reflection (i) The incident rays, normals, and reflected rays are all in the same plane. (Ii) The angle of incidence is equal to the angle of reflection.

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The the flame test is used to identify some inorganic chemical elements, by means of the emission of light by the phenomenon of atomic excitation by the increase in temperature.

In this sense, when an atom is excited, it means that it has left its ground state (in which each electron occupies its place in its orbit, around the nucleus), when this happens some electron jumps out of the orbit it occupied in its fundamental state to an outer orbit, further away from the nucleus and then return to the ground state, emitting in the form of light the energy received.

To understand it better:

An excited electron is an unstable electron, and when passing from one orbit to another, it produces light of a specific wavelength (color) that depends on the amount of energy the electron loses.

This is how the color of the light emitted in the flame is related to a characteristic chemical element.

As more resistors are added in parallel across a constant voltage source, there are more paths for current to take.  So more current dribbles out of the source, and the total current supplied by the source increases.

The power supplied by the battery is (voltage) x (current).  So if the voltage is constant and the current increases, the power being supplied must also increase.

choice-c

Answer:

Is the mass number

Explanation:

Every atom is usually identified by using two different numbers:

- Atomic number: generally labelled with Z, corresponds to the number of protons in the nucleus, so Z = p

- Mass number: generally labelled with A, corresponds to the number of protons+neutrons in the nucleus, so A = p + n

To find the number of neutrons in a nucleus, therefore, we can do

n = A - Z