A ______ object is a source if light.

Answer: Option 2

Explanation:

Option 1 is wrong because there are 2 protons and 2 neutrons in nucleus.

Option 3 is wrong because there are two electrons moving around nucleus.

Option 4 is wrong because electrons are negatively charged and are moving around the nucleus.

Option 5 is wrong because there equal amount of protons and electrons with 2 each.

C) Gravity and drag

Explanation:

Here we are considering the ball after it has been hit by a bat.

When the ball is in the air, there are only two forces acting on it:

There is no applied force on the ball, since that one only acts on the ball when it is in contact with the bat - however, when the ball is in the air, the applied force no longer acts on the ball.

Therefore, the correct answer is

C. gravity and drag

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Answer:

C) Gravity and drag

Explanation:

Here we are considering the ball after it has been hit by a bat.

When the ball is in the air, there are only two forces acting on it:

The weight of the ball (force of gravity), acting downward. Its magnitude is given by , where m is the mass of the ball and g is the acceleration of gravity

The air drag, which is the resistance of the air on the ball, acting downward as well (it acts against the direction of motion of the ball). The magnitude of this force is proportional to the speed of the ball

There is no applied force on the ball, since that one only acts on the ball when it is in contact with the bat - however, when the ball is in the air, the applied force no longer acts on the ball.

Therefore, the correct answer is

C. gravity and drag

Mechanical energy is conserved in all the four situations

Explanation:

The law of conservation of energy states that in absence of non-conservative forces (such as air resistance of friction), the mechanical energy of an object is conserved.

The mechanical energy of an object is the sum of its potential energy (PE) and its kinetic energy (KE):

E = PE + KE = const.

In all the situations described, there are no air resistance or friction acting on the system, therefore mechanical energy is conserved in all the four situations described.

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To determine the amount of heat passing through the walls of the container, we can calculate the rate of heat transfer through conduction using the formula q = k * A * (T2 - T1) / d. Once we have the rate of heat transfer, we can multiply it by the time to find the total heat transferred.

To determine how much heat passes through the walls of the container, we need to calculate the heat transfer through conduction. The rate of heat transfer can be calculated using the formula q = k * A * (T2 - T1) / d, where q is the heat transfer, k is the thermal conductivity of the material, A is the surface area, T2 is the temperature outside the container, T1 is the temperature inside the container, and d is the thickness of the walls. We can then multiply the rate of heat transfer by the time to find the total heat transferred. In this case, the temperature outside the container is 35.0°C and the temperature inside the container is 0°C.

Let's calculate the heat transfer rate:

q = k * A * (T2 - T1) / d

Assuming the thermal conductivity of the plastic-foam material is known and given, we can substitute the values into the equation and calculate the rate of heat transfer. Once we have the rate of heat transfer, we can multiply it by the time to find the total heat transferred.

Answer:

76200

Explanation:

1) The potential energy is the most at the highest position and the least at the equilibrium position

2) The kinetic energy is the most at the equilibrium position and  the least at the highest position

Explanation:

1)

The potential energy of an object is the energy possessed by the object due to its position in a gravitational field; mathematically, it is given by

[tex]PE=mgh[/tex]

where

m is the mass of the object

g is the strength of the gravitational field

h is the height of the object relative to the ground

For the pendulum in this problem, m is the mass of the bob, and h is the height of the above relative to the ground. We see from the formula that the potential energy is directly proportional to the height:

[tex]PE\propto h[/tex]

This means that:

2)

We can solve this part by applying the law of conservation of energy: in fact, the total mechanical energy of the pendulum (sum of potential and kinetic energy) is constant at any time during the motion,

[tex]E=KE+PE=const.[/tex]

where KE is the kinetic energy.

From the equation above, we observe that:

Therefore, this implies that:

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Answer:

C

Explanation: Because its water, self explainitory.

The amount of gravity between 1 kg of lead and Earth is the same as the amount of gravity between 1 kg of marshmallows and Earth.

Answer: Option C

Explanation:

According to universal law of gravity, the gravitational force is directly proportionate to the product of masses of the interacting objects and inversely proportionate to its distance squared between them.

Since the mass of Earth is very high compared to the mass of the other objects, be it lead or marshmallows, and the distance will be mostly same. Thus, there will be no change in the amount of gravity acting between them. Thus, the amount of gravity between 1 kg of lead and Earth is the same as the amount of gravity between 1 kg of marshmallows and Earth.

The amount of gravity between 1kg of lead and the Earth is the same as between 1kg of marshmallows and the Earth. The amount of gravity depends on the mass and distance, not on the material of the objects. This is based on Newton's law of universal gravitation.

The amount of gravity that the Earth exerts on an object doesn't depend on the material of the object, but it does depend on the mass. Since both the 1kg of lead and the 1kg of marshmallows have the same mass, then the amount of gravity between them and the Earth is the same.

This principle is reflected in Newton's universal law of gravitation, expressed as F=G*(m1*m2)/r^2, where F is the force of gravity, m1 and m2 are the masses of the two objects, r is the distance between their centers, and G is the gravitational constant. Regardless of whether the object is made of lead or marshmallows, if the mass remains the same as 1kg, then the gravitational force, hence the gravity between the Earth and the object, will also be the same.

So, to answer your question, the amount of gravity between 1kg of lead and Earth is the same as the amount of gravity between 1kg of marshmallows and Earth.

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Answer:

C. A full moon.

Explanation:

A is a year.

B is a day.

D I'm not sure how often a lunar eclipse occurs, but definitely the every month!

Among the given options, the phenomenon which occurs once in every month is full moon. Rotation of earth is taking place every day and revolution of earth around sun is completing within one year.

The lunar phase during which the moon is completely lit from Earth's viewpoint is known as the full moon. When earth is situated halfway between the sun and the moon, this happens.

This indicates that the lunar hemisphere facing earth's near side is fully illuminated by the sun and appears as a roughly spherical disc. On average, there is a full moon once each month.

A synodic month, or the duration between a full moon and the subsequent occurrence of the same phase, lasts on average around 29.53 days.

Therefore, the full moon occurs on either the 14th or 15th day of the lunar month in those lunar calendars where each month starts on the day of the new moon. 

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The angular momentum is 89.6 kg-m^2/s.

The angular velocity is 9.142 rad/s.

Explanation:

Momentum is the product of rotational inertia to the angular velocity.

Angular momentum = m *v = 5.6 * 16 = 89.6 kg-m^2 / s.

Angular velocity is the rate of velocity at which an object is rotating around a center or a specific point in a given time period. It is also known as rotational velocity. Angular velocity is measured in radian per second (rad/s).

angular velocity = angular momentum / rotational inertia

                          = 89.6 / 9.8 = 9.142 rad / s.

Answer:

I will say that the the potential energy will be at its maximum.

Explanation:

potential energy deals with gravity and gravity deals with height, so when a object is in its maximum height it will have the maximum potential energy.  

Answer: 125 m

Explanation:

This problem is related to vertical motion and can be solved with the following equation:

[tex]y-y_{o}=V_{o}t-\frac{1}{2}gt^{2}[/tex] (1)

Where:

[tex]y-y_{o}=\Delta y[/tex] is the difference between the final height [tex]y[/tex] and initial height [tex]y_{o}[/tex]. Let's take into account the initial height is greater than the final height, since the skydiver is descending.

[tex]V_{o}=0 m/s[/tex] Is the skydiver's initial velocity, assuming the plane was not moving at that moment

[tex]t=5 s[/tex] is the time

[tex]g=10 m/s^{2}[/tex] is the acceleration due gravity

Solving the equation:

[tex]\Delta y=-\frac{1}{2}gt^{2}[/tex] (2)

[tex]\Delta y=-\frac{1}{2}(10 m/s^{2})(5 s)^{2}[/tex] (3)

[tex]\Delta y=-125 m[/tex] (4) Here, the negative sign only indicates the position of the skydiver, and remember the initial height is greater than the final height.

In fact, the distance is positive: 125 m

Answer: The pressure from the air and force of who or what used effort to make it move. For example you roll a ball it doesn't stop unless it runs out of the force which in this case would be energy.

Explanation:

Knowledge

The Carbon-Oxygen cycle is regulated by three great reservoirs "Organisms, Oceans and Rocks".

Answer: Option A, D and E

Explanation:

The steps of the carbon and oxygen cycle are:

The atmosphere is the reservoir and regulated by the terrestrial biosphere freshwater bodies and non-living organic material like soil carbon, the sediments like fossil fuels and the oceans which involve dissolved inorganic carbon also living and non-living marine biota.

Answer:

a

d

e

Explanation:

Answer:

11.44pC.

Explanation:

F = kq1q2/r^2

q2 = Fr^2/kq1

     = 4.5 x 0.31^2/4.2x 9 x 10^9

     = 1.144 x 10^-11C

     = 11.44pC

The sign is minus since they attracted to each other

The balanced chemical reaction is

2K + 2H2O--- H2 + 2KOH

A chemical equation is described as the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.

From the example, if we follow the stoichiometry of the reaction , 2 moles of potassium metal reacts with 2 moles of water to give 1 mole of hydrogen gas and 2 mole potassium hydroxide.

The chemical equation is very important as it tells us about the reacting species and resulting product.

The coefficient of the reacting species and resulting products gives information about the mole ratio or molecular ratio of the elements or compounds in the reaction.

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Answer: D

Explanation:

Cause removing excess waste from the body helps to maintain a steady health

Final answer:

The excretory system's role in removing excess waste is critical for preventing disease and supporting cell function by maintaining a balanced internal environment and removing harmful substances.

Explanation:

The excretory system plays a crucial role in maintaining the overall health of the body by ensuring the removal of excess waste and toxins. This system includes organs such as the kidneys, liver, skin, lungs, and large intestine. The kidneys filter blood, removing waste products and excess substances, forming urine which is then excreted from the body.

The skin eliminates waste through sweat, the liver metabolizes toxins and excretes bilirubin, the lungs expel carbon dioxide and water vapor, and the large intestine helps to remove solid waste. By doing all this, the excretory system helps prevent the accumulation of harmful substances which could lead to disease and supports the function of cells by maintaining a stable internal environment.

Removing excess waste helps to prevent disease by eliminating toxins that can damage tissues and cells. It also supports cell function by maintaining a balance of water, salts, and organic substances within the body. Therefore, the correct answer to the question is: d. Removing excess waste helps prevent disease and supports cell function.

Answer: kinetic energy only

Explanation: kinetic energy only since it's moving

Answer:

True

Explanation:

The given statement is true.

Secondary succession refers to the series of community changes that take place on previously established but damaged or disturbed habitat.

It helps in reviving or re-establishment of the similar ecosystem that previously existed.

It starts by a disturbing event such as natural disaster (hurricane, tornado, earthquake et cetera) and human interventions (deforestation, accidental forest fires caused by human activities, habitat destruction due to mining or dam construction et cetera) which greatly reduce the ecosystem already established.

Human impact on ecosystems often leads to secondary succession rather than primary succession.

In ecosystems, primary succession occurs in areas that were previously devoid of life, such as newly formed volcanic islands or bare rock surfaces. Secondary succession, on the other hand, occurs in areas that have been disturbed but still retain some soil or remnants of the original community.

Human impact on ecosystems often leads to disturbances such as deforestation, fires, or agriculture. These disturbances create conditions for secondary succession rather than primary succession, as there is generally still some soil and seed bank present.

For example, if a forest is clear-cut, the remaining soil and seeds in the area can allow for the regrowth of vegetation, leading to secondary succession.

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Answer:

A)- SHORT WAVELENGTH AND LOW AMPLITUDE.

Explanation:

high pitch sound waves possess low wavelength and

quiet sound means that amplitue of the sound wave is low.

therefore option A matches the answer most.

Answer:

A)- SHORT WAVELENGTH AND LOW AMPLITUDE.

Explanation:

high pitch sound waves possess low wavelength and

quiet sound means that amplitue of the sound wave is low.

therefore option A matches the answer most.

Answer:0.50m/s divide by 0.050sec = 10m/s

Explanation: dividing the meter per second [m/s] by the second [s

The average acceleration during this time interval is [tex]-2.67 \mathrm{m} / \mathrm{s}^{2}[/tex]

Explanation:

Average acceleration can be measured as the ratio of change in speed to change in time. As the initial speed at initial time is 30 m/s at t = 0 and then at t = 6 s, the speed is decreased to 14 m/s. Then the average acceleration will be

[tex]Average acceleration =\frac{14-30}{6-0} =-2.67m/s^{2}[/tex]

So the average acceleration is negative which indicates that there is deceleration occurrence in the system.

1) At the top of the building, the ball has more potential energy

2) When the ball is halfway through the fall, the potential energy and the kinetic energy are equal

3) Before hitting the ground, the ball has more kinetic energy

4) The potential energy at the top of the building is 784 J

5) The potential energy halfway through the fall is 392 J

6) The kinetic energy halfway through the fall is 392 J

7) The kinetic energy just before hitting the ground is 784 J

Explanation:

1)

The potential energy of an object is given by

[tex]PE=mgh[/tex]

where

m is the mass

g is the acceleration of gravity

h is the height relative to the ground

While the kinetic energy is given by

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

where v is the speed of the object

When the ball is sitting on the top of the building, we have

This means that the ball has more potential energy than kinetic energy.

2)

When the ball is halfway through the fall, the height is

[tex]h=20 m[/tex]

So, half of its initial height. This also means that the potential energy is now half of the potential energy at the top (because potential energy is directly proportional to the height).

The total mechanical energy of the ball, which is conserved, is the sum of potential and kinetic energy:

[tex]E=PE+KE=const.[/tex]

At the top of the building,

[tex]E=PE_{top}[/tex]

While halfway through the fall,

[tex]PE_{half}=\frac{PE_{top}}{2}=\frac{E}{2}[/tex]

And the mechanical energy is

[tex]E=PE_{half} + KE_{half} = \frac{PE_{top}}{2}+KE_{half}=\frac{E}{2}+KE_{half}[/tex]

which means

[tex]KE_{half}=\frac{E}{2}[/tex]

So, when the ball is halfway through the fall, the potential energy and the kinetic energy are equal, and they are both half of the total energy.

3)

Just before the ball hits the ground, the situation is the following:

Therefore, just before the ball hits the ground, it has more kinetic energy than potential energy.

4)

The potential energy of the ball as it sits on top of the building is given by

[tex]PE=mgh[/tex]

where:

m = 2 kg is the mass of the ball

[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity

h = 40 m is the height of the building, where the ball is located

Substituting the values, we find the potential energy of the ball at the top of the building:

[tex]PE=(2)(9.8)(40)=784 J[/tex]

5)

The potential energy of the ball as it is halfway through the fall is given by

[tex]PE=mgh[/tex]

where:

m = 2 kg is the mass of the ball

[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity

h = 20 m is the height of the ball relative to the ground

Substituting the values, we find the potential energy of the ball halfway through the fall:

[tex]PE=(2)(9.8)(20)=392 J[/tex]

6)

The kinetic energy of the ball halfway through the fall is given by

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

where

m = 2 kg is the mass of the ball

v = 19.8 m/s is the speed of the ball when it is halfway through the  fall

Substituting the values into the equation, we find the kinetic energy of the ball when it is halfway through the fall:

[tex]KE=\frac{1}{2}(2)(19.8)^2=392 J[/tex]

We notice that halfway through the fall, half of the initial potential energy has converted into kinetic energy.

7)

The kinetic energy of the ball just before hitting the ground is given by

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

where:

m = 2 kg is the mass of the ball

v = 28 m/s is the speed of the ball just before hitting the ground

Substituting the values into the equation, we find the kinetic energy of the ball just before hitting the ground:

[tex]KE=\frac{1}{2}(2)(28)^2=784 J[/tex]

We notice that when the ball is about to hit the ground, all the potential energy has converted into kinetic energy.

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Answer:

Quest ions

(Score for Question 1: ___ of 7 points)

1. Does the bowling ball have more potential energy or kinetic energy as it sit on top of the building? Why?

Answer: The bowling ball has more potential energy as it sits on top of the building because the force necessary to take the object from greater height will be more than from a lower height. Potential energy is stored energy, so when an object's height changes, its potential falls and becomes lower.

(Score for Question 2: ___ of 7 points)

2. Does the bowling ball have more potential energy or kinetic energy as it is half way through its fall? Why?

Answer: The potential and kinetic energy are the same as it is half way through its fall. The height is 20m half way through the fall, that also means that the potential energy is half of when the ball was at the top of the building.  

E= PE + KE,  

E= PE at the top,  

E= PE half way + KE half way = PE at the top / 2 + KE half way = E / 2 + KE half way,  

PE half way= PE at the top / 2 = KE half way = E / 2,

So when the ball is half way the kinetic energy and potential energy are equal, and each is half of the total energy.

(Score for Question 3: ___ of 7 points)

3. Does the bowling ball have more potential energy or kinetic energy just before it hits the ground? Why?

Answer: The bowling ball has more kinetic energy just before it hits the ground because it’s moving faster, and the faster something moves, the more kinetic energy it has.

(Score for Question 4: ___ of 4 points)

4. What is the potential energy of the bowling ball as it sits on top of the building?  

Answer:  

PE= mgh

Given:

mass= 2 kg,

gravity= 9.8m/s2,

height (where it’s located) = 40m,

PE= (2) (9.8) (40) = 748J

(Score for Question 5: ___ of 4 points)

5. What is the potential energy of the ball as it is half way through the fall, 20 meters high?  

Answer:

PE= mgh

Given:

mass= 2 kg,

gravity= 9.8m/s2,

height (where it’s located) = 20m,

PE= (2) (9.8) (20) = 392J

(Score for Question 6: ___ of 3 points)

6. What is the kinetic energy of the ball as it is half way through the fall?  

Answer:  

KE= ½mv2  

Given:

m= 2kg

v (the speed of the ball when it is halfway through the fall) = 19.8m/s

KE= ½ (2) (19.8)2 = 392J

(Score for Question 7: ___ of 3 points)

7. What is the kinetic energy of the ball just before it hits the ground?  

Answer:

KE= ½mv2  

Given:

m= 2kg

v (the speed of the ball when it is halfway through the fall) = 28m/s

KE= ½ (2) (28)2 = 784J

The time required for a bicycle to travel the distance of 100 m is 50 s.

Explanation:

We know that speed is the measure of how fast an object can move to cover a given distance in given time. So it is measured as the ratio of distance per unit time.

            [tex]Speed =\frac{\text { Distance }}{\text { Time }}[/tex]

As it is scalar quantity, direction does not play any role in it.

So time taken for covering the distance of 100 m with speed of 2 m/s can be determined as

           [tex]Time =\frac{\text { Distance }}{\text { Speed }}=\frac{100}{2}=50 seconds[/tex]

Thus, 50 s will be required by the bicycle to cover 100 m distance.

Camera is an optical instrument that forms images in a way most like human eyes.

Explanation:

The eye consists of a small spherical globe of about 2 cm in diameter, which is free to rotate under the control of 6 extrinsic muscles. Light enters the eye through the transparent cornea, passes through the aqueous humor, the lens, and the vitreous humor, where it finally forms an image on the retina.

In case of a digital camera, CCD is used known as charged coupled device. CCD is actually in the shape of array or a rectangular grid. It is like a matrix with each cell in the matrix contains a censor that senses the intensity of photon. When light falls on the object , the light reflects back after striking the object and allowed to enter inside the camera which is then stored by CCD in the form of electric signals.

Similarities between eye and a camera:

Cornea and Lens - The cornea is the “cap” of the eye. This transparent (like clear jelly) structure sits to the front of the eye. The lens of a camera is also transparent (glass) and sits at the front of the body.  Both allows light to enter and have spherical curvature.

Iris and aperture -The aperture is to the camera as the iris is to the eye. Both control the amount of light allowed to enter the eye or camera.

Retina and Film - The retina sits at the back of the eye and collects the light reflected from the surrounding environment to form the image. The same task in the camera is performed either by film or sensors in digital cameras.

Keywords: eye, camera, CCD, iris, film, aperture, cornea, lens, image formation

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A microscope forms images most similar to the eye due to the use of lenses and focusing techniques.

A microscope forms images in a way most like your eye. Both the eye and the microscope utilize lenses to form images. The method of focusing in the eye, through changes in the curvature of a lens, differs slightly from most optical instruments but is more similar to how a microscope forms images.

Answer:

Explained below:

Explanation:

Water quality is determined in terms of the physical, chemical and biological content of water. The quality of water of lakes and rivers variates with the seasons and also geographic areas, still in the absence of pollution. There are  so many factors  which affect water quality are as follows :

Pesticides

Temperature

Runoff

Sedimentation

Erosion

pH

Dissolved oxygen

Pesticides

Litter and rubbish

Decayed organic materials

Toxic and hazardous substances

Oils, grease, and other chemicals

Answer:

KE = .5(m)(v²) and PE = mgh

Explanation:

m = mass, v = velocity, g = gravity (9.8 on earth), h = height.

Answer:

[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2 \ , \ PE=mgh}}}}[/tex]

Explanation:

Kinetic energy formula

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

Potential energy formula

[tex]\displaystyle PE=mgh[/tex]

[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]

[tex]\displaystyle PE \Rightarrow \sf potential \ energy \ (J)[/tex]

[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]

[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]

[tex]\displaystyle g \Rightarrow \sf acceleration \ of \ gravity\ (m/s^2)[/tex]

[tex]\displaystyle h \Rightarrow \sf height \ (m)[/tex]

Answer:

The power of 10 in the given value is 5.

Explanation:

scientific notation is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.

Answer:

1.57821 * 10^5  (5)

Explanation:

Scientific notation is defined as the representation in which a number is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.

We are given a numerical value of 157,821

Converting this into scientific notation, we get:

Hence, the power of 10 in the given numerical value is 5.

To determine the height at which the speed of the ball decreases to one-half of its initial value, we need to consider the vertical motion of the ball. By finding the time it takes for the ball to reach its maximum height and the time it takes for the speed to decrease on its way down, we can calculate the height above the launch point.

The question is asking at what height above its launch point the speed of the ball decreases to one-half of its initial value. To determine this, we need to consider the vertical motion of the ball. Let's assume the launch point is at a height of 0 m.

Using the given information, we can find the time it takes for the ball to reach its maximum height using Equation 4.22. Then, we can calculate the time it takes for the speed of the ball to decrease to one-half of its initial value by finding the time it takes for the ball to reach the same height on its way down.

By considering the time it takes for the ball to reach its maximum height and the time it takes for the speed to decrease, we can determine the height above the launch point at which the speed is one-half of its initial value.

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