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2 years ago

if you burn your hand grabbing a hot cup of coffee, what type of thermal energy transfer has taken place?

Physics

2 answers:

Grace [21]2 years ago

8 0

The answer to your question is conduction

9966 [12]2 years ago

4 0

Answer:

Conduction Mode of Heat Transfer

Explanation:

When transfer of heat requires medium to transmit heat from one end to other end then this may be due to (i) Conduction or (ii) Convection

While it do not require any medium to transmit heat in Radiation mode of heat transfer.

So here in the given example we are holding a cup of tea so here thermal energy is transferred by the medium of cup from Tea to our hand.

When medium particles move from one position to other position along with thermal energy then this is known as convection mode of heat transfer while in conduction mode of heat transfer we know that medium particles remains at their own position and heat is transferred from one point to other.

So here in this example the heat is transferred through the medium of cup which and the molecules of cup do not move. So here energy transfer is by CONDUCTION mode of heat transfer

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A particle is in uniform circular motion. Assume a standard rtz coordinate system. If you deconstruct the net force acting on th

Kitty [74]

Answer:

a) One

Explanation:

In a uniform circular motion there must be a force acting to keep it in the circular track. This force can either be centripetal or a centrifugal force.

According to the Newton's first law of motion a particle continues to be in state of rest or in uniform motion until acted upon by an external force.

Here the term uniform motion need to be understood which refers to the uniform velocity of the particle in accordance to the vector laws.

3 0

2 years ago

Which of the following is not a factor in whether a reaction will spontaneously occur? A. Entropy change of the system B. Enthal

Delvig [45]

Answer:

Explanation:

pressure change have nothing to do with the spontaneity.

Entropy change , enthalpy change , temperature have roles in deciding spontaneity.

6 0

2 years ago

A hot piece of iron is thrown into the ocean and its temperature eventually stabilizes. Which of the following statements concer

777dan777 [17]

Answer:

E. The ocean gains more entropy than the iron loses.

Explanation:

When there is a spontaneous process , entropy of the system increases . Here hot iron is losing entropy and ocean is gaining entropy . Net effect will be gain of entropy . That means entropy gained by ocean is more than entropy lost by iron .

Hence option E is correct .

8 0

2 years ago

The gravitational force produce between any two object kept 2.5×10 to the power 4 km apart is 580N.At what distance should they

timofeeve [1]

Answer:

d = 3.54 x 10⁴ Km

Explanation:

Given,

The distance between the two objects, r = 2.5 x 10⁴ Km

The gravitational force between them, F = 580 N

The gravitational force between the two objects is given by the formula

F = GMm/r² newton

When the gravitational force becomes half, then the distance between them becomes

Let us multiply the above equation by 1/2 on both sides

( 1/2) F = (1/2) GMm/r²

= GMm/2r²

= GMm/(√2r)²

Therefore, the distance becomes √2d, when the gravitational force between them becomes half

d = √2r = √2 x 2.5 x 10⁴ Km

= 3.54 x 10⁴ Km

Hence, the two objects should be kept at a distance, d = 3.54 x 10⁴ Km so that the gravitational force becomes half.

3 0

2 years ago

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitt

geniusboy [140]

Answer:

The distance of the speaker B would be 1 meters.

Explanation:

Given that,

Frequency of the waves emitted, f = 172 Hz

You are 8.00 m from the speaker.

The speed of sound in air to be 344 m/s.

The wavelength of the wave is given in terms of frequency and the speed of sound. It is given by :

$v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344\ m/s}{172\ Hz}\\\\\lambda=2\ m$

Since, the distance from the Speaker A is 8 m which is the integral multiple of the wavelength. Let the closest distance of the speaker B would be given by :

$d=\dfrac{\lambda}{2}\\\\d=\dfrac{2}{2}\\\\d=1\ m$

So, the distance of the speaker B would be 1 meters. Hence, this is the required solution.

5 0

2 years ago