xvii. Heat travels from one end of an iron rod to the other end by
A Convection
B Radiation
C Conduction
D Vibration
xix. Which one of the following statements about heat transfer is incorrect?
A Convection can take place in a vacuum.
B Convection can take place in a liquid.
C A convection current can be present in gas.
D Sun heats up the earth by convection.
xx. When matters changes state, its temperature:
A Increases
B Decreases
C Changes to the temperature of surrounding.
D Remains same.

Answer:

Without a diagram or specific values for the circuit, it is not possible to provide a specific answer to this question. However, according to Kirchhoff's Current Law, the sum of the currents entering a junction in a circuit must equal the sum of the currents leaving the junction. Therefore, the sum of the electric currents in the three branches of a circuit must equal the current leaving the source. This relationship is essential to ensure the conservation of electric charge in a circuit.

Explanation:

The total current leaving the source in a circuit is equal to the sum of the currents in all branches of the circuit, according to Kirchhoff's current law.

To calculate the sum of the electric currents in the three branches of the circuit, we need to use Kirchhoff's current law, which states that the sum of the currents entering any node in a circuit must be equal to the sum of the currents leaving that node.

In the circuit, there are three branches with currents of 2 amperes, 3 amperes, and 4 amperes, respectively. According to Kirchhoff's current law, the sum of these currents entering the junction must be equal to the current leaving the source.

Therefore, the sum of the currents in the three branches is:

2 A + 3 A + 4 A = 9 A

This means that a total current of 9 amperes is leaving the source.

The relationship between the sum of the currents in the three branches and the current leaving the source is that they must be equal, according to Kirchhoff's current law. This law is a consequence of the principle of conservation of charge, which states that charge cannot be created or destroyed in a circuit.

Therefore, the total amount of charge entering a node must be equal to the total amount of charge leaving that node, and this is reflected in the principle of conservation of current.

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The spring stiffness constant of the spring is 1276.44 N/m.

We know that Hooke’s Law is given by, F = -kx, where F is the force applied to an object, x is the displacement caused by the force, and k is the spring constant.

Therefore, the spring stiffness constant of the spring is given by k = -F / x.Let us first determine the potential energy of the ball, which will be equal to the kinetic energy of the ball when it strikes the spring. We can use the formula, PE = mgh, where m is the mass of the ball, g is the acceleration due to gravity, and h is the vertical distance fallen by the ball.

Therefore, the potential energy of the ball is given by,PE = mgh= 2.60 kg × 9.81 m/s² × 0.55 m= 14.38 JNow, the ball will transfer all its potential energy to the spring, which will store it as potential energy in the form of elastic potential energy. Therefore, the elastic potential energy stored in the spring is given by, PE = (1/2)kx², where x is the compression of the spring.

Therefore, we have,PE = (1/2)kx²

= (1/2)k (0.15 m)²

= 0.01125 k J

Setting the two expressions for PE equal to each other, we get,1

4.38 J = 0.01125 k JK

= (14.38 J) / (0.01125 J/k)

= 1276.44 N/m

Therefore, the spring stiffness constant of the spring is 1276.44 N/m.

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Answer: B

Explanation: B is the correct statement describing the positions of the Moon, the Sun, and the Earth during a new moon. The Moon is between Earth and the Sun.

During a new moon, the Moon is positioned between the Sun and the Earth, with the illuminated side of the Moon facing away from the Earth. This means that the side of the Moon that faces the Earth is not receiving any sunlight, making it invisible to us from Earth. The new moon is the first phase of the lunar cycle and occurs roughly every 29.5 days.

Answer:

what

you need to elaborate

Answer: Can you please write question clearly.

Explanation:

The voltage between the plates is 3.9 × \(10^-^3\) V.

The work-energy theorem states that the delta in the equation equals the change in kinetic energy plus the change in potential energy. Here, a charge's potential energy is expressed as qV, where V is the position's electric potential.  The greater the change in voltage per unit distance, the greater the electric field.

The kinetic energy of the electrons = 4.1 × \(10^-^1^5\) J

Charge of the electron = 1.602 × \(10^-^1^9\) coulomb

Using,

     ΔU = q × ΔV

4.1 × \(10^-^1^5\) = 1.602 × \(10^-^1^9\) × ΔV

      ΔV  = 3.9 × \(10^-^3\) V

Therefore, the voltage between the plates is 3.9 × \(10^-^3\) V.

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The force that results in the decrease in speed from the midpoint to the end of the track is friction. The friction force slows down the vehicle because it acts in the opposite direction of the car's motion.

The force that would cause the Hot Wheels car to slow down from the midpoint of the track to the end of the track is friction between the car's wheels and the track.

Friction is a force that opposes motion between two surfaces in contact.

In this case, the wheels of the car and the surface of the track are in contact, and the friction force acts in the opposite direction of the car's motion, which slows it down.

As the Hot Wheels car travels down Track #2 during the Speed Lab activity, its initial velocity decreases due to friction.

Friction is a resistance force that opposes motion.

It is caused by the interaction between the surfaces in contact. In this case, the surface of the track and the wheels of the car are in contact.

When the car is moving, there is friction between the two surfaces.

The direction of the friction force is opposite to the direction of motion of the car.

This means that the friction force slows the car down.

In conclusion, the force that results in the decrease in speed from the midpoint to the end of the track is friction.

The friction force slows down the vehicle because it acts in the opposite direction of the car's motion.

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Answer: Your answer is 1.36.

Hope this helps!

Galileo challenged the Aristotelian-Ptolemaic model, providing support for the heliocentric model and paving the way for a new understanding of the universe.

Galileo Galilei played a crucial role in challenging the prevailing geocentric model of the universe proposed by Aristotle and supported by Ptolemy. He provided several lines of evidence that effectively disproved their theories and supported the heliocentric model proposed by Nicolaus Copernicus. Some of the key evidence used by Galileo includes:

1. Observations through a telescope: Galileo was one of the first astronomers to use a telescope to observe the heavens. His telescopic observations revealed several important discoveries that contradicted the Aristotelian-Ptolemaic worldview. He observed the phases of Venus, which demonstrated that Venus orbits the Sun and not Earth. He also observed the four largest moons of Jupiter, now known as the Galilean moons, which provided evidence for celestial bodies orbiting a planet other than Earth.

2. Sunspots: Galileo's observations of sunspots provided evidence that the Sun is not a perfect celestial body, as suggested by Aristotle. Sunspots indicated that the Sun has imperfections and undergoes changes, challenging the notion of celestial perfection.

3. Mountains on the Moon: Galileo observed the rugged and uneven surface of the Moon, which contradicted Aristotle's belief in celestial spheres made of perfect, unchanging material. The presence of mountains on the Moon suggested that celestial bodies are subject to the same physical laws as Earth.

4. Phases of Venus: Galileo's observations of the phases of Venus provided direct evidence for the heliocentric model. As Venus orbits the Sun, it goes through phases similar to the Moon, ranging from crescent to full. This observation strongly supported the idea that Venus revolves around the Sun.

These lines of evidence presented by Galileo challenged the Aristotelian-Ptolemaic model, providing support for the heliocentric model and paving the way for a new understanding of the universe. His work marked a significant turning point in the history of science and laid the foundation for modern astronomy.

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Answer:

magnitude is 1382.59 N/C

Explanation:

Given the data in the question;

The time taken is;

t = x / v

we substitute;

t = ( 2 × 10⁻²) / ( 5.69  × 10⁶ )

t = 3.5149 × 10⁻⁹ s

next, the acceleration is;

a = 2y/t² = [2( 0.150 × 10⁻²)] / [ ( 3.5149 × 10⁻⁹ )² ]

a =  2.42826 × 10¹⁴ m/s²

now, the electric field is;

E = ma / q

we know that;

mass of electron m = 9.11 × 10⁻³¹ kg,

charge of electron q = 1.60 × 10⁻¹⁹ coulomb

we substitute

E = ( 9.11 × 10⁻³¹ )(2.42826 × 10¹⁴) / 1.60 × 10⁻¹⁹

E = 2.21214 × 10⁻¹⁶  / 1.60 × 10⁻¹⁹

E = 1.3826 × 10²¹

E = 1382.59 N/C

Therefore, magnitude is 1382.59 N/C  

- The resistance of the first resistor (R₁) is 12 Ω.

- The electromotive force (EMF) of the battery is 18 V.

- The internal resistance of the battery is 12 Ω.

To solve the given problem, we can apply Kirchhoff's laws and Ohm's law to determine the resistance of the first resistor (R₁) and the electromotive force (EMF) and internal resistance of the battery.

Let's start by calculating the resistance of the first resistor (R₁):

1. Apply Ohm's law to find the voltage drop across the external circuit:

  V = I * R

  V = 1 A * 6 Ω

  V = 6 V

2. The voltage drop across the external circuit is equal to the EMF minus the voltage drop across the internal resistance of the battery:

  V = E - Ir

  6 V = E - (1 A * r)   (where r is the internal resistance of the battery)

3. We also know that the EMF of the battery is the sum of the voltage drops across each cell in the battery:

  E = 6 cells * 3 V/cell

  E = 18 V

4. Substitute the value of E in the equation from step 2:

  6 V = 18 V - r

  r = 12 Ω

Therefore, the resistance of the first resistor (R₁) is 12 Ω.

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Answer:

Explanation:

When the puck is sliding on the ice, there is no force being exerted on the puck to keep it moving forward. Instead, inertia keeps the puck moving forward. Friction between the puck and the ice gradually slows the puck down. You hit a hockey puck and it slides across the ice at nearly a constant speed

At constant speed and varying position of the hockey puck, implies a change in the velocity of the hockey puck and net force is acting on it to keep it in motion.

According to Newton's second law of motion, the force applied to a an object is directly proportional to the product of mass and acceleration of the object.

F = ma

Acceleration is the change in the velocity of an object per change in time of motion.

Thus, we can conclude that at constant speed and varying position of the hockey puck, implies a change in the velocity of the hockey puck and net force is acting on it to keep it in motion.

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Answer:

a

Explanation:

answer:

2.5 m/s²

Explanation:

120 km/h = 120 ÷ 3.6 = 100/3 ≈ 33 m/s

a = (v2 - v1)/∆t = (33m/s - 0)/ 13s = 33/13 m/s²≈ 2.5 m/s²

The head loss doubles when the average velocity is doubled.

The vector quantity velocity (v), denoted by equation v = s/t, quantifies dislocation (or shift in position, s), over change in time (t).

Velocity is the pace and direction of the an object's movement, whereas speed is the timekeeping at which an object is travelling along a path.In other words, velocity is a vector, whereas speed is indeed a scalar value.

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Answer:

John Sebastian Bach

Answer:

Johann Sebastian Bach

Explanation:

please tell me if i am wrong! thank you!

On a figure or object and in a short statement banner you can plan to use text in your political cartoon.

What exactly are political cartoons used for?

A drawing that offers a humorous or unfavorable opinion about particular political persons or occasions. The objective is to influence the audience to take a particular stance on a historical event. A political cartoon expresses the views of its artist. It has an effect on the brain of spectators. But more often than not, they are attempting to persuade you than to amuse you. An effective political cartoon tries to convince you to agree with the cartoonist's point of view while also provoking discussion about current events by making their image in your brain.

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Two charged objects are separated a distance d,  the position vector of the object 1 with respect to the object 2 is P21 = d/2(√3i -j).

It is assumed in the problem that the origin is taken into account when determining the position of object 2. As a result, we may decompose the position vector of object 1 into its x and y components.

So, we can see from the diagram that the position vector's horizontal component is dcos30. This component is known as the x component because it lines up with the positive x axis. Hence, x=dcos30. Once more, dsin30 is the vertical component of the position vector. This component is known as the y component because it is congruent with the negative y axis. Hence, y=dsin30.

As a result, the position vector can be expressed as,

⇒P21=xi^+y(−j^)

The values P21=dcos30i+dsin30(j) are substituted

Now, the values of cos30 are 3-1/2 and sin30 are 12.

In order to substitute the values, we obtain P21=3-2di12dj.

Now, if we take the common, we get P21 = d/2(√3i -j).

This is the position vector of the object 1 with respect to the object 2.

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if the values of mass (m) and radius (R) are provided, the moment of inertia of the body about an axis through the center of disk A can be calculated as (3/2) * m * R^2, and the kinetic energy of the rotating body would be 162 * m * R^2 Joules.

To calculate the moment of inertia of the body about an axis through the center of disk A, we need to consider the moment of inertia contributions from each individual disk and add them up.

Let's denote the moment of inertia of each disk as I_A, I_B, and I_C, respectively. The moment of inertia of a disk rotating about its center can be calculated using the formula:

I = (1/2) * m * r^2

Where m is the mass of the disk and r is its radius.

Since the struts have negligible weight, we can assume that each disk has the same mass.

Let's assume the mass of each disk is m and the radius of each disk is R.

The moment of inertia of disk A (I_A) is given by:

I_A = (1/2) * m * R^2

The moment of inertia of disk B (I_B) and disk C (I_C) will be the same since they have the same mass and radius:

I_B = I_C = (1/2) * m * R^2

The total moment of inertia of the body about the axis through the center of disk A (I_total) is the sum of the individual moment of inertias:

I_total = I_A + I_B + I_C

= (1/2) * m * R^2 + (1/2) * m * R^2 + (1/2) * m * R^2

= (3/2) * m * R^2

To calculate the kinetic energy of the rotating body, we can use the formula:

Kinetic Energy = (1/2) * I_total * ω^2

Substituting the given values:

Kinetic Energy = (1/2) * ((3/2) * m * R^2) * (6.0 rad/s)^2

Simplifying further, if the values of m and R are given, we can calculate the moment of inertia and kinetic energy.

Assuming that the values of mass (m) and radius (R) are given, we can calculate the moment of inertia (I_total) and kinetic energy.

For the given values of ω = 6.0 rad/s and the previously calculated I_total:

I_total = (3/2) * m * R^2

Kinetic Energy = (1/2) * I_total * ω^2

= (1/2) * [(3/2) * m * R^2] * (6.0 rad/s)^2

= (9/2) * m * R^2 * (36.0 rad^2/s^2)

= 162 * m * R^2 Joules

Therefore, if the values of mass (m) and radius (R) are provided, the moment of inertia of the body about an axis through the center of disk A can be calculated as (3/2) * m * R^2, and the kinetic energy of the rotating body would be 162 * m * R^2 Joules.

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Answer:

Atoms are the thing that make up molecules and compounds. Molecule. Two or more atoms joined together with covalent bonds. Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Compound. Two or more elements bonded together through ionic attraction.

The bullet stops moving on hitting on a surface. Hence, the impulse here is equal to the momentum. Therefore, the mass of the bullet is 0.1 Kg.

Impulse in physics is the change in momentum. It is the product of the force and change in time.

hence, impulse = f. dt

When the bullet is travelling with  a velocity of 500 m/s it has a momentum. When it brought to rest, momentum become zero. Thus, the momentum is equal to the impulse here.

Therefore, f.dt = m. v

f.dt = 50 N s

v = 500 m/s

m = 50 N s/500 m/s = 0.1 Kg

Therefore, the mass of the bullet is 0.1 Kg.

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The work required to move a 1 nC charge from an electric potential of 0 V to a potential of 18 V is 18 nJ (Option f).

When moving a charge in an electric field, the work done can be calculated using the formula W = qΔV, where W is the work done, q is the charge, and ΔV is the change in electric potential.

In this case, the charge is\(0.36V * 1600 kg/m^3 = 0.36 * 0.088 m^3 * 1600 kg/m^3 = 88 kg.\)) and the change in potential is 18 V. Plugging these values into the formula, we get\(W = (1 × 10^-9 C)(18 V) = 18 × 10^-9 J = 18 nJ.\)

Therefore, the correct answer is option f. No other options accurately represent the work required to move the charge in this scenario.

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The volume of the box is 9,000 cubic centimeters or cubic centimetres (cm³).

The volume of a box is given by the formula:

V = l × w × h

where V is the volume, l is the length, w is the width, and h is the height of the box.

In this case, we are given that the height of the box is 15 cm, the width is 30 cm, and the depth is 20 cm.

Therefore, we can calculate the volume of the box as:

V = l × w × h

V = 20 cm × 30 cm × 15 cm

V = 9,000 cm³

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Answer:

a sphere of influence mmmmmmmmmmm not actually right

The temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

Using the ideal gas law, we can write: PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature. Since the mass of air is not changing, we can write: PV = constant.

Applying this to the situation where the air mass rises to a level where the pressure is 8.70×10⁴ Pa, we get:

Dividing the second equation by the first and using the fact that γ=Cp/Cv=1.40 for air, we get:

Solving for T2, we get:

Thus, the temperature of the air mass when it has risen to a level at which atmospheric pressure is only 8.70×10⁴ Pa is approximately 14.3°C.

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Answer:

it is due to anamolous expansion of water as water cools from 4dg.c to 0dg.c. it expand making ice lighter than water to float

Answer:

The frequency increases by 4 because it is inversely proportional to the wavelength.

The useful energy will the machine generate in 15 minutes is 81 kJ.

Work is defined as the energy that is applied to or removed from an object by applying force along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the same direction as the motion.

When a force is applied, it is said to have a component that moves the point of application, or it is said to have positive work. If the component of a force at the point of application is in the opposite direction of the displacement, the force is said to do negative work.

when a ball is suspended above the ground and then dropped, the gravitational force acting on the ball causes positive work to be done, and this.

Therefore, The useful energy will the machine generate in 15 minutes is 81 kJ.

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