Which two energy sources can help a star maintain its internal thermal pressure? which two energy sources can help a star maintain its internal thermal pressure? nuclear fission and gravitational contraction nuclear fusion and chemical reactions chemical reactions and gravitational contraction nuclear fusion and gravitational contraction nuclear fusion and nuclear fission?

Answer:

Area under v-t graph = total displacement

Explanation:

The area under velocity time graph gives the total displacement of any object. Th attached figure shows a velocity time graph. In which the y axis shows the velocity and x axis shows the time taken.

The velocity is from 0 to 20 m/s and time is from 0 to 15 s. The total displacement is given by the area of region OABC.

So, d = 2 × area of triangle + area of rectangle

[tex]d=2\times \dfrac{1}{2}\times 5\times 20+5\times 20[/tex]

d = 200 m

The total displacement covered by an object in this case is 200 m. Hence, the total displacement during the time interval of a graph can be determined by v-t graph.

The force constant of the spring is roughly0.171 kN/ m. The contraction  needed for the spring's implicit energy to equal0.0078 J is roughly0.381 cm.

To calculate the force constant of the spring( k), we use the formula for the implicit energy of a compressed or stretched spring, which is U = 1/2 k x2. Rearranging this formula to  break for k gives k =  2U/ x2. Substituting U = 0.0025 J and x = 0.54 cm( or0.0054 m) into the formula yields k = ( 2  J)/(0.0054 m) 2. Calculating this, we find k = 171.296 N/ m or  roughly0.171 kN/m.

For part( b), when seeking the  contraction  needed to produce a implicit energy of0.0078 J, we start from the formula U = 1/2 k x2 again. fitting the implicit energy U = 0.0078 J and the  preliminarily calculated force constant k = 171.296 N/ m into the formula and  working for x delivers x = sqrt(2 extasteriskcentered0.0078 J)/171.296 N/ m). This results in an x value of roughly0.00381 m or0.381 cm.

Answer:

The correct answer is option (i), amplifies sound vibrations

Explanation:

Cochlea is part of the inner ear that is responsible for receiving the sound vibrations. The received sound vibration is then converted into nerve impulses which are then send  to the brain for interpretation. Cochlea amplifies the sound so that they can be easily detected even by a damaged ear and it is also able to stimulate the hearing nerve directly.

The cochlea amplifies sound vibrations.

The cochlea is a spiral, hollow, conical chamber inside the human ears which is made up of a bone.

Cochlea is  present inside the inner ear its function is to receive the sound vibrations.

The received sound vibration is then converted into nerve impulses which are then send  to the brain for interpretation.

Cochlea amplifies the sound so that they can be easily detected even by a damaged ear and it is also able to stimulate the hearing nerve directly.

Hence The cochlea amplifies sound vibrations.

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Here we have to calculate the pressure difference between two ends of the tube.

The diametre of tube [d] =1.90 mm

we know that  1 mm=[tex]10^{-3}[/tex]

The radius of tube [r]=0.95 mm i.e 0.00095 m

The length of the tube [l]=9.40 cm i.e 0.0940 m

The coefficient of visocity of the oil [tex][\eta][/tex] =0.20 pa.s

The rate of flow of oil [tex][\frac{dv}{dt} ]=6.4mL/min[/tex]

we know that 1 mL=[tex]10^{-3} L=10^{-6}m^{3}[/tex]  [1L=[tex]10^{-3} m^{3} ][/tex]

     Hence 6.4mL/m^3= [tex]1.067*10^{-7}[/tex] m^3/s

we know that [tex]\frac{dv}{dt} =\frac{\pi pr^4}{8\eta l}[/tex]

Hence [tex]p=\frac{dv}{dt} *8\eta l*\frac{1}{\pi r^4}[/tex]

        ⇒ [tex]p=1.067*10^{-7} *8*0.20*0.0940 *\frac{1}{ 3.14*[0.00095]^4}[/tex] pa

        ⇒ P=6.274630973*[tex]10^{3}[/tex] pa

The correct answer is D. The force between the two charges will be 4 times as strong if the distance is divided by 2.

According to Coulomb's Law, the electric force (F) between two point charges is directly proportional to the product of the magnitudes of the charges (q1 and q2) and inversely proportional to the square of the distance (r) between them. Mathematically, this is expressed as:

[tex]\[ F = k \frac{|q_1 q_2|}{r^2} \][/tex]

where [tex]\( k \)[/tex] is Coulomb's constant ([tex]\( k = 8.988 \times 10^9 \, \text{N m}^2/\text{C}^2 \)[/tex]).

If the distance [tex]\( r \)[/tex] is divided by 2, the new distance becomes [tex]\( r' = \frac{r}{2} \)[/tex]. The new force [tex]\( F' \)[/tex] can be calculated by substituting [tex]\( r' \)[/tex] into Coulomb's Law:

[tex]\[ F' = k \frac{|q_1 q_2|}{(r')^2} = k \frac{|q_1 q_2|}{\left(\frac{r}{2}\right)^2} = k \frac{|q_1 q_2|}{\frac{r^2}{4}} = k \frac{4 |q_1 q_2|}{r^2} = 4 \left(k \frac{|q_1 q_2|}{r^2}\right) \][/tex]

[tex]\[ F' = 4F \][/tex]

Thus, the force between the two charges is 4 times stronger when the distance between them is halved. This is because the force is inversely proportional to the square of the distance, so reducing the distance by a factor of 2 results in a force that is [tex]\( 2^2 = 4 \)[/tex] times stronger.

To lift a 12 kg pail at a constant speed over a distance of 10 meters in 5 seconds, Jill requires a power of 235.44 W. This is calculated using the weight of the pail, the distance lifted, and the time taken.

To determine how much power is required to lift a 12 kg pail straight up at a constant speed over a distance of 10 meters in 5 seconds, we can follow these steps:

1. Calculate the force needed: Since the pail is moving at a constant speed, the force needed to lift it is equal to its weight.

The weight (force due to gravity) is given by:

2. Calculate the work done: Work done in lifting the pail can be calculated as:

3. Calculate the power required: Power is the rate at which work is done. It can be calculated as:

Therefore, the power required to lift the pail at a constant speed over the specified distance in the given time is 235.44 W.

Answer:

Explanation:

A one volt change in potential means that the potential electrostatic energy changes by one Joule per Coulomb.

Since you would be pushing the charge against the field, and expend 10 J, the voltage would be 10 Volts higher.

That 10 J will be converted to kinetic energy if the charge flies back to the starting position without friction.

Final answer:

The voltage created when pushing 1 C of charge with 10 J of work is 10 V. Upon release, if no other forces act on the charge, it would have a kinetic energy of 10 J when it flies past its starting position.

Explanation:

When 10 J of work is done to push 1 C of charge against an electric field, the voltage (or electric potential difference) with respect to its starting position can be found using the formula V = W/Q, where V is the voltage, W is the work done, and Q is the charge. Therefore, V = 10 J / 1 C = 10 V.

According to the principle of conservation of energy, if no other forces act on the charge when it is released, all the potential energy will be converted into kinetic energy as it flies past its starting position. Therefore, the kinetic energy (KE) at that point will be equal to the work previously done on the charge, so KE = 10 J.

Orbittal is referred to the region around the nucleus occupied by the electrons.

This can be defined as a small, dense region consisting of protons and neutrons and is usually located at the center of an atom.

The electrons are present around the nucleus in a region which is referred to as orbittal and are actively involved in  chemical reactions.

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The statement which best describes how heat flows is that the heat generally flows from a warmer object to a colder object. Therefore, the correct option is A.

The mechanism of heat flow significantly describes the transfer of heat energy or enthalpy from one object to another. It is transferred through the process of conduction, convection, and radiation.

The object that is warmer in appearance may accumulate heat in enough amounts. This leads to an increase in its temperature and energy, While the mechanism of heat transfer generally initiates this warmer object to a colder object by conduction.

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a. The puck's average acceleration is equal to -1.2 [tex]m/s^2[/tex].

b. The coefficient of kinetic friction between the puck and the ice is 0.122.

Given the following data:

a. To find the puck's average acceleration:

Mathematically, acceleration is given by the formula;

[tex]Acceleration = \frac{V_f\; - \;V_i}{t}[/tex]

Where:  

[tex]Acceleration = \frac{6\; - \;12}{5}\\\\Acceleration = \frac{-6}{5}[/tex]

Average acceleration = -1.2 [tex]m/s^2[/tex]

b. To find the coefficient of kinetic friction between the puck and the ice:

The frictional force acting between the puck and the ice is given by the formula;

[tex]F = uN = -umg\\\\F = -umg\\\\\frac{F}{m} = -ug[/tex]....equation 1.

But, [tex]a = \frac{F}{m}[/tex]   ....equation 2.

We know that acceleration due to gravity (g) of an object is equal to 9.8 meter per seconds square.

[tex]a = -ug\\\\u = \frac{-a}{g}\\\\u = \frac{-(-1.2)}{9.8} \\\\u = \frac{1.2}{9.8}[/tex]

Coefficient of kinetic friction, u = 0.122

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Answer: Option (a) is the correct answer.

Explanation:

Momentum is defined as the ability or tendency of an object to continue moving.

Also, momentum is the product of mass and velocity. It can be shown as follows.

                      p = m × v

where,     p = momentum

               m = mass

               v = velocity

Thus, we can conclude that out of the given options, the formula p = mv show the relationship between momentum, mass, and velocity.

Answer:

A,D,F

Explanation:

The image distance and magnification is mathematically given as

Question Parameter(s):

An object is placed 20.0 cm from the front of

a converging lens of focal length 10.0 cm.

Generally, the equation for the lens equation   is mathematically given as

1 / i + 1 / o = 1 / f

Therefore

i = o f / (o - f)

i1 = 30 * 15.2 / (30 - 15.2)

i1= 30.8 cm

Therefore

i2 = 9.4 * 15.2 / (9.4 - 15.2)

i2= - 24.6 cm

In conclusion, magnification

M = m1 * m2

M= (-30.8 / 30) * (24.6 / 9.4)

M= -2.69

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Answer:

If the resistance in both resistors is doubled, then voltage gets doubled.

Explanation:

It is given that, A circuit consists of a battery and two resistors connected in parallel.

In parallel combination of resistors the potential difference remains the same while the current divides. The equivalent resistance is given by :

[tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}[/tex]      

Initial condition, Let R₁ = R₂ = R

So, [tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R}+\dfrac{1}{R}[/tex]

[tex]{R_{eq}=\dfrac{R}{2}[/tex]  

Using Ohm's law,          

[tex]V=IR_{eq}=\dfrac{IR}{2}[/tex]...............(1)

Final condition, If the resistance in both resistors is doubled, and the current is kept constant.

So, [tex]\dfrac{1}{R'_{eq}}=\dfrac{1}{2R}+\dfrac{1}{2R}[/tex]      

[tex]{R'_{eq}=R[/tex]  

Voltage, [tex]V'=IR'_{eq}=IR[/tex]............(2)

From equation (1) and (2),

[tex]V'=2V[/tex]

So, the new voltage gets doubled. Hence, this is the required solution.    

(-6C₆) / x⁷ newton; it is an attractive force.  

Given:

The potential energy of a pair of hydrogen atoms separated by a large distance x is given by [tex]\boxed{ \ U(x) = - \frac{C_6}{x^6} \ }[/tex], where C₆ is a positive constant.  

Question:

The Process:

Let us rewrite the potential energy of the pair of the hydrogen atom:

[tex]\boxed{ \ U(x) = - \frac{C_6}{x^6} \ }[/tex]

The component of a conservative force in a particular direction, equals the negative of the derivative of the corresponding potential energy, properly concerning a displacement in that direction.

For one-dimensional motion, say along the x-axis, the relationship between force and potential energy is as follows:

[tex]\boxed{ \ \overrightarrow{F} = F_x \hat{i} = - \frac{\delta U}{\delta x} \hat{i} \ }[/tex]

Let us determine the force.

[tex]\boxed{ \ F_x \hat{i} = - \frac{\delta}{\delta x} \Big( - \frac{C_6}{x^6} \Big) \ \hat{i} \ }[/tex]

[tex]\boxed{ \ F_x \hat{i} = - (- C_6) \frac{\delta}{\delta x} \Big( \frac{1}{x^6} \Big) \ \hat{i} \ }[/tex]

[tex]\boxed{ \ F_x \hat{i} = C_6 \frac{\delta}{\delta x} (x^{-6}) \ \hat{i}} \ }[/tex]

[tex]\boxed{ \ F_x \hat{i} = (C_6)(-6)x^{-7} \ \hat{i} \ }[/tex]

Thus, we get: [tex]\boxed{\boxed{ \ F_x = - \frac{6C_6}{x^7} \ \hat{i} \ }}[/tex]

From the data problem above, we know that C₆ is a positive constant. Hence, Fₓ is positive when x is negative and vice versa. Thus Fₓ is always directed toward the origin. Besides, a negative sign means that an attractive force occurs.

In essence, the directions are toward the origin, since this is the potential energy for a restoring force.

_ _ _ _ _ _ _ _ _ _

Notes:

We know that the difference of potential energy from point 1 to point 2 as the negative of the work done:  

[tex]\boxed{ \ \Delta U_{12} = U_2 - U_1 = - W_{12} \ }[/tex]

The work done by the given force as the particle moves from coordinate x to (x + d x) in one dimension is  

[tex]\boxed{ \ dW = \overrightarrow{F} \cdot d \vec{r} \ } \rightarrow \boxed{ \ \overrightarrow{F} = \frac{dW}{d \vec{r}} \ }[/tex]

Therefore, for motion along a straight line, a conservative force  is the negative derivative of its associated potential energy function, i.e.,

[tex]\boxed{ \ \overrightarrow{F} = F_x \hat{i} = - \frac{\delta U}{\delta x} \hat{i} \ }[/tex]

_ _ _ _ _ _ _ _ _ _

Conservative force : force that does work independent of path.

A. Mountain ranges linking in England and America

The theory of plate tectonics was promoted by the idea of continents drifting over time, which was proposed by Alfred Wegener. This concept was supported by evidence from fossils and rock formations, eventually leading to the development of the theory of plate tectonics.

One idea used to promote the theory of plate tectonics is the concept of continents drifting over time. This idea was first proposed by Alfred Wegener in the early 20th century. He pointed out that the continents appeared to fit together like puzzle pieces, and he used evidence from fossils and rock formations to support his hypothesis of continental drift. Eventually, this idea led to the development of the theory of plate tectonics, which explains how the Earth's crust is divided into several plates that move and interact with each other.

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The examples of kinetic energy is ceiling fan and washing machine.

The examples of potential energy is stretched rubber band and electric battery.

The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes.

Potential energy in physics is the energy that an item retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.

The gravitational potential energy of an item, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field are examples of common types of potential energy.

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