In words, explain the Lawson criterion and its significance. a)One needs high densities for extended time periods to produce enough energy for fusion reactions to break even. b)One needs high densities for short time periods to produce enough energy for fusion reactions to break even. c)One needs low densities for extended time periods to produce enough energy for fusion reactions to break even. d)One needs low densities for short time periods to produce enough energy for fusion reactions to break even

Option A is correct. The force on an object that has a mass of 10 kg and an acceleration of 4 m/s² will be 40 N.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

Force is defined as the product of mass and acceleration. Its unit is Newton.

F=ma

F=10 ×4

F=40N

The force on an object that has a mass of 10 kg and an acceleration of 4 m/s² will be 40 N.

Hence, option A is correct.

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A string of fifty 15 ohm Christmas tree lights are connected parallelly. When one of them burns , the rest stay lit. The total resistance is :

Total resistance = 3.266 ohm

A break in any one of the path does not interrupt the flow of current in the remaining paths. Sum of the reciprocals of individual resistance is equal to the the reciprocal of the total resistance .

If the two resistances connected in parallel are equal and of the same value, then the total resistance, RT is equal to half the value of one resistor.

A string of fifty 15 ohm Christmas tree lights are connected parallelly. One of them burns, the rest stay lit,

Total resistance in parallel = 1/R1 +1/R2+....

= 1/15 +1/15+...…. 1/15  (49 times as one burns )

= 1/15* 49

= 3.266 ohm.

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A 2.0-kilogram cart traveling at a constant speed in a horizontal circle of radius 3.0 meters. The magnitude of the centripetal force of the cart is 24 newtons. The speed of the car is 6 m/s. Thus, Option A is the correct answer.

To find the speed, the given values are,

Mass m = 2 Kg

Radius r =3 meters

Centripetal force = 24 Newtons.

A centripetal force is the force which is made up of two Latin words centrum which means center and peterum which means to seek.

It is defined a force which make a body to follow a curved path. The direction of this force is always orthogonal to the body's motion and it is always towards the fixed point which is instantaneous center of the path's curvature.

Centripetal force is expressed according to the formula;

F = mv²/r

m is the mass of the body

v is the speed of the cart

r is the radius

Substituting the values into the formula and get v,

24 = 2v²/3

24×3 = 2v²

72 = 2v²

v² = 72/2

v² = 36

v =√36

v = 6m/s

Hence, the speed of the cart is 6m/s. Thus, Option A is the correct answer.

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Answer:

C.

Explanation:

""""""" Twice,Half """"""

A big wheel with twice the circumference of a small wheel will rotate with the force and the speed of the small wheel.

C) twice, half

A big wheel with twice the circumference of a small wheel will rotate with twice the force and half the speed of the small wheel.

It is the round circle found on the outside angle of the machine.

It is the adjusted barrel or rod-like portion put on the interior of the machine that's connected to the wheel and makes a difference to advance development.

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Answer:

false is the answer . in my point of view

Given data:

* The distance covered in the given case is 150 meters.

* The time taken to cover the distance is 18 seconds.

Solution:

In the case of uniform motion of the body, the average speed of the body is the ratio of distance traveled and time taken by the body.

Thus, the average speed of the given person is,

Thus, the average speed in m/s is 8.33 m/s.

Answer:

I think no B

if wrong correct me plsssssss

Mark me brainliest

have a nice day

I will always help you understanding your assingments

#Captainpower:)

Answer:

Icy roads

Explanation:

There is so little friction you slide on it way more than other roads. :)

The theory of relativity is a set of scientific ideas developed by Albert Einstein that fundamentally changed our understanding of space and time.

There are two parts to the theory of relativity: special relativity and general relativity.

Special relativity deals with the behavior of objects that are moving at a constant speed relative to one another. It states that the laws of physics are the same for all observers, regardless of their relative velocity. This means that the passage of time and the measurement of distances can appear different to observers in different frames of reference.

General relativity extends the ideas of special relativity to include the effects of gravity. It describes gravity as the curvature of spacetime caused by the presence of matter or energy. In other words, massive objects like planets and stars create a "dent" in spacetime, and other objects will follow the curve of this dent and move in a predictable path, which we perceive as the force of gravity.

In simple terms, the theory of relativity describes how the laws of physics apply to objects in motion and in the presence of gravity, and it has had a profound impact on our understanding of the universe.

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Answer:

Frequency = 5.92 Hz

Color of light = yellow

Explanation:

Equation for frequency: speed of light divide wavelength (in meters)

Put in values given in question: 299792458m/s divide (5.06 x 10^7 m)

Frequency = 5.924752134 (5.92) m

The color of light depends on its wavelength. A wavelength of 5.06 x 10^7 m, shows the color of yellow.

Answer:

Centripetal acceleration = 46.26m/s2

Tension = 4.6N

Explanation:

Centripetal acceleration is given by the following formula: \(a_c = \frac{v^2}{r}\)

So, to calculate acceleration we first need velocity and radius.

The radius is given to us as 75cm = 0.75m, and we can find velocity from the following formula:\(v=r\omega\) where w = the angular velocity given by: \(\omega = \frac{2\pi}{T}\)

We are given a period of 0.80s, meaning that our angular velocity is:

\(\frac{2\pi}{0.80} = 7.85 rad s^{-1}\)

Now we just need to multiply is by the radius to find the velocity:

\(0.75*7.85=5.89ms^{-1}\)

Finally we square the velocity and divide by the radius to find the final centripetal acceleration: \(\frac{5.89^{2} }{0.75} =46.26ms^{-2}\)

\(F=\frac{mv^{2} }{r}\) so we just need to multiply the centripetal acceleration by mass to get the tension force of the string: \(46.26*0.1 = 4.6N\)

Hope this helped!

The characteristics of the thermistors allow to design an experiment to analyze the dependence of resistance with temperature;

      1) We set up the circuit

      2) We look for the current of the circuit and we keep it fixed.

      3) We look for the thermistor resistances for each temperature.

      4) Plot Resistance versus Temperature.

A Thermitor is an element whose resistance changes with temperature, for example a platinum resistance.

An experiment that we can carry out to measure is to set up the attached circuit where we have:

Let's start by looking for the current in the circuit.

In thermistors, the resistance for room temperature is given, so if we measure the voltage across the fixed resistor, we can shrink the voltage across the thermistor.

           \(V_{source} = V_R + V_{therm} \\V_{therm} = V_{source} - V_R \\ i = \frac{V_{therm} }{R_{therm}}\)

This current remains fixed, since the fixed resistance is greater than the resistance of the thermistor throughout the range.

Second step.

Now we can change the temperature that is measured in the thermometer, for each temperature the voltage in the fixed resistance is measured, the resistance in the thermistor is calculated.

        \(R_{therm} = \frac{V_{source} - V_R}{i}\)  

Third step.

We end with a graph of resistance versus temperature of the curve obtained, it is possible to understand the behavior of the resistance of the thermistor with temperature.

In conclusion with the characteristics of thermistors we can design an experiment to analyze the dependence of resistance with temperature:

      1) We set up the circuit

      2) We look for the current of the circuit and we keep it fixed.

      3) We look for the thermistor resistances for each temperature.

      4) Plot Resistance versus Temperature.

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Various examples of applied and normal forces and friction are mentioned.

The normal force is the force that prevents two objects from passing through each other, while the applied force is the force that is exerted on an object by an external agent.

Friction is a force that opposes the relative motion between two surfaces in contact. It arises due to the microscopic irregularities on the surface of the objects that interlock with each other when they are in contact.

Pushing a shopping cart in a grocery store.

Throwing a ball towards a wall.

Using a broom to sweep the floor.

The force exerted by the floor on our feet when we stand still.

The force exerted by a chair on our body when we sit on it.

The force exerted by a book on a table when we keep it on it.

The force that causes a pencil to stop moving on a rough surface.

The force that helps our shoes grip the ground when we walk.

The force that prevents a car from slipping on a wet road while applying brakes.

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Answer:

11.a) Car B  is faster than Car A. This is because Car B covers more distance in less time, whereas Car A covers less distance in more time. Now, as we know that distance is directly proportional and time is inversely proportional to speed. In Car B, a larger distance and less time and a smaller distance and more time in Car A, indicates that the speed of Car B is more than the speed of Car A.

b) Car B accelerates faster than Car A. We know that, the acceleration is directly proportional to the change in linear velocity and inversely proportional to time taken. Here, The overall journey of Car B is short, whereas for Car A, it's longer. Also, as previously mentioned that the final speeds of Car B is more than Car A [remembering that both Cars start from the origin(rest)]. Hence, the change of velocity in Car B is more than Car A. Hence so.

Answer:

34.51

Explanation:

k=1/2mv² is the kenetic energy equation to fill is in

k=[1/2(0.235)×50]²

Scalar is the measurement of a unit strictly in magnitude. Vector is a measurement that refers to both the magnitude of the unit and the direction of the movement the unit has taken.

Classify each measurement as a scaled or vector a 20 books on a shelf?

a-scalar

b-vectot

c-scalar

d-vector

e-vector

f-scalar

g-scalar

h-scalar

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Answer:

2.75 m

Explanation:

Given that,

Little baby bird drops the worm and sadly watches it fall to the ground below in 0.75 seconds.

We need to find how high is the nest. Let it is h. It can be calculated using second equation of motion as follows :

\(h=ut+\dfrac{1}{2}at^2\)

Here, u = 0 and a = g

\(h=\dfrac{1}{2}gt^2\\\\h=\dfrac{1}{2}\times 9.8\times (0.75)^2\\\\h=2.75\ m\)

So, the nest is 2.75 m high.

Answer:

2,158.8 mi?

Explanation:

sorry if this is wrong

The SI unit of current is the ampere, which is defined as the flow of charge in units of coulomb over a period of time measured in seconds.

Electrical charge carriers, often electrons or atoms deficient in electrons, travel as current. The capital letter I is a typical way to represent the current. The ampere, denoted by the letter A, is the common unit. An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor. One coulomb of electrical charge (6.24 x 1018 charge carriers) traveling by a given place in one second is represented by one ampere of current.

Conventional current, also known as Franklin current, is thought by physicists to flow from relatively positive points to comparatively negative locations. The most prevalent charge carriers, electrons, are negatively charged. From somewhat negative to relatively good points, they move.

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In conclusion, the experiment aimed to determine the acceleration due to gravity by measuring the period of a simple pendulum. The experiment was performed by measuring the length of the pendulum and recording the time for 10 oscillations. The data was then used to calculate the average period and subsequently, the acceleration due to gravity using the formula: g = (4π²L)/T².

Based on the results obtained, the acceleration due to gravity was found to be (9.79 ± 0.06) m/s², which is in good agreement with the accepted value of 9.81 m/s². The small discrepancy could be due to the experimental errors such as air resistance, friction and measurement errors.

Overall, the experiment was successful in determining the acceleration due to gravity using a simple pendulum and demonstrated the relationship between the period and the length of the pendulum.

Answer:

0.0520kg

Explanation:

divide by 1000

A projectile consists of two independent motions. A uniform motion along the horizontal direction.

Thus, A uniformly accelerated motion along the vertical direction. From the equations of motion, it is possible to derive an expression for the range of a projectile and speed.

U is the initial speed  is the angle of projection is the acceleration due to gravity. For the projectile in this problem, we have: d = 15 km = 15,000 m is the range is the initial speed.

A horizontal line is all that a sleeping line is. The same principle applies to a thermometer resting horizontally on the ground as it does to a man. Vertical's opposite is horizontal. In geometry, standing and sleeping are denoted by the terms vertical and horizontal, respectively.  

Thus, A projectile consists of two independent motions. A uniform motion along the horizontal direction.

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The bungee jumper's acceleration is zero when she achieves her top speed. This is due to the fact that acceleration is the rate at which velocity changes, and since velocity is constant at maximum speed, there is neither change nor acceleration.

This is evident because when the bungee cord is completely stretched, the upward force is at its strongest. Within 2.4 seconds, or in the midst of the second free-fall phase, the jumper arrived at the highest position. Around -9.8 m/s2 of downward acceleration is present.

The elastic force from the bungee cord pushing up against the jumper as it expands slows his descent and temporarily stops him.

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In physics, a system is said to be in equilibrium when neither its internal energy state nor its state of motion tend to vary over time. If all of the forces operating on a single particle are vector summated to zero, equilibrium occurs.

In physics, tension is the pulling force that is conveyed axially by a string, cable, chain, or other similar one-dimensional continuous item, or by either end of a rod, truss member, or other similar three-dimensional object.

Equilibrium refers to the state of a system when neither its internal energy state or state of motion tend to change over time. Equilibrium for a single particle occurs when the vector sum of all force acting on the particle is zero.

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Answer:

\({FY} = \dfrac{3}{4} \times FX\)

Explanation:

The parameters given for the planets are;

The mass of planet X = M and the radius of planet X = R

The mass of planet Y = 3·M and the radius of planet Y = 3·R

The magnitude of the gravitational force of the planets on their satellites are given by the following equation;

\(F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}\)

Where;

M₁ = The mass of the first object = The mass of the planet

m₂ = The mass of the second object = The mass of the satellite

R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite

G = The universal gravitational constant

The force between planet X and the satellite in its orbit = \(FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}\)

The force between planet Y and the satellite in its orbit = \(FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}\)

Therefore;

\(\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}\)

\({FY} = \dfrac{3}{4} \times FX\)

The molarity of the solution is 0.01196 M.  The molarity of the solution can be calculated using the formula:  Molarity = moles of solute / liters of solution

To find the moles of solute, we need to know the molar mass of copper (II) sulfate.

CuSO₄ has a molar mass of 159.61 g/mol.

Using the given information, we can calculate the moles of CuSO₄ present in the solution:

moles of CuSO₄ = mass of CuSO₄ / molar mass of CuSO₄

moles of CuSO₄ = 5.25 g / 159.61 g/mol

moles of CuSO₄ = 0.0329 mol

Now that we have the moles of solute, we can use the formula to calculate the molarity:

Molarity = moles of solute / liters of solution

Molarity = 0.0329 mol / 2.75 L

Molarity = 0.01196 M

Therefore, the molarity of the solution is 0.01196 M.

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Answer:

In which direction does the current in circuit A flow?

counterclockwise

Explanation:

The current flowing through the circuit A is \(I = \frac{e}{r_1 + r_2}\).

"Your question is not complete, it seems to be missing the following information",

find the the current flowing through the resistors in circuit A;

The given parameters;

The equivalent resistance of the circuit A in series is calculated as follows;

\(R_e = r_1 + r_2\)

The emf of the battery connected to circuit A

emf = e

The current flowing through the circuit A is calculated as follows;

\(V= IR\\\\I = \frac{V}{R} \\\\I = \frac{e}{R_e} \\\\I = \frac{e}{r_1 + r_2}\)

Thus, the current flowing through the circuit A is \(I = \frac{e}{r_1 + r_2}\).

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The process shown is an example of alpha emission, as it involves the emission of an alpha particle (consisting of two protons and two neutrons) from the uranium nucleus to form the thorium nucleus.
The process you provided, 23892U → 23490Th + 42He, is an example of:
b) alpha emission

1. Identify the initial element and the products: The initial element is uranium-238 (23892U), and the products are thorium-234 (23490Th) and helium-4 (42He).
2. Compare the initial element and the products: The uranium-238 nucleus loses two protons and two neutrons, forming thorium-234 and a helium-4 nucleus.
3. Determine the type of radioactive decay: Since a helium-4 nucleus (also known as an alpha particle) is emitted, this process is an example of alpha emission.

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Answer: The amplitude is 0. (assuming that the amplitude ot both initial waves is the same)

Explanation:

When two monochromatic light waves of the same wavelength and same amplitude undergo destructive interference, means that the peak of one of the waves coincides with the trough of the other, so the waves "cancel" each other in that point in space.

Then if two light waves undergo destructive interference, the amplitude of the resultant wave in that particular point is 0.

Answer:

No, the resulting wave in the diagram does not demonstrate destructive interference. The resulting wave in the diagram shows a bigger wave than Wave 1 or Wave 2. If it demonstrated destructive interference, it would be a smaller wave or a horizontal line. With destructive interference, waves break down to form a smaller wave, or cancel each other out, resulting in no wave formation.

Explanation:

edge

The object will eventually experience a large vertical acceleration since the vertical velocity increases as the object moves downwards.

The horizontal motion of a projectile is the motion of the projectile along a horizontal path.

The horizontal distance of a projectile is not affected by gravity and hence the horizontal speed of a projectile remains constant. That is the initial horizontal velocity is equal to the final horizontal velocity of the projectile.

However, the during the vertical motion an object, the vertical velocity decreases as the object moves upwards and eventual becomes zero when the object reaches the maximum height.

As the object begins to move downwards the vertical velocity increase and eventually become maximum before the object hits the ground.

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