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VladimirAG [237]
3 years ago
6

Energy is transferred in solids by conduction, which means that?

Physics
2 answers:
Elza [17]3 years ago
6 0

Answer:

The answer is C

Explanation:

Conduction is the transfer of energy (in this case heat) from one substance to another substance through direct contact. This definition rules out the option D which suggests that heat does not travel between objects of different temperatures.

It is also impossible for heat to be transferred from a cooler object to a hotter object (as claimed in option B) because the atoms in hotter objects are more energized than cooler objects and are hence able to pass there energy to the cooler object whose atoms in less energized or in a relaxed state if cold. This reason also rules out option A because the hotter object contains more energized particles and hence energy (heat) cannot be passed from the cooler object nor can the heat travel in both directions.

From the explanation in the previous paragraphs, it is clear that energy transfer in solids occurs when heat travels from the hotter object to the cooler object via conduction.

Ivahew [28]3 years ago
5 0
The answer is C, also knows as balancing energy, the energy will eventually be the same.
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g Calculate the maximum wavelength of light that will cause the photoelectric effect for potassium. Potassium has work function
Ivahew [28]

Answer:

λ = 5.4196 10⁻⁷m,  λ = 541.96 nm    this is green ligh

Explanation:

The photoelectric effect was explained by Eintein assuming that the light was made up of particles called photons and these collided with the electrons taking them out of the material.

 

                     K = h f -Ф

where K is the kinetic energy of the ejected electrons, hf is the energy of the light quanta and fi is the work function of the material.

The speed of light is related to wavelength and frequency

                   c = λ / f

                  f = c /λ

we substitute

                K = h c / λ - Φ

for the case that they ask us the kinetic energy of the electons is zero (K = 0)

                 h c / λ = Ф

                λ = h c / Ф

we calculate

                 λ = 6.63 10⁻³⁴  3 10⁸ / 3.67 10⁻¹⁸

                 λ = 5.4196 10⁻⁷m

let's take nm

                lam = 541.96 nm

this is green light

4 0
3 years ago
In which situation are the individual molecules moving the fastest?
svet-max [94.6K]

Answer: d boiling water

Explanation: the water is boiling and bubbling cause the molecules are so fast and they hit off each other

4 0
3 years ago
Read 2 more answers
A baseball is launched horizontally from a height of 1.8 m. The baseball travels 0.5 m before hitting the ground. How fast is th
zysi [14]

Answer:

0.83 m/s

Explanation:

FIrst of all, we have to find the time of flight, i.e. the time the baseball needs to reach the ground. This can be done by using the equation for the vertical motion:

h=ut+\frac{1}{2}gt^2

where

h is the initial height

u = 0 is the initial vertical velocity

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

t is the time

Substituting h = 1.8 m and solving for t,

t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2(1.8)}{9.8}}=0.61 s

We know that the horizontal distance travelled by the ball is

d = 0.5 m

Therefore, we can find the horizontal velocity (which is constant during the whole motion):

v= \frac{d}{t}=\frac{0.5}{0.60}=0.83 m/s

4 0
2 years ago
A 6.7 kg block is released from rest on a frictionless inclined plane making an angle of 25.7° with the horizontal. Calculate th
yulyashka [42]

Answer:

So time taken by block to travel 0.5 m from rest will be 0.4853 sec

Explanation:

We have given mass of the block m = 6.7 kg

angle of inclination \Theta =25.7^{\circ}

Distance traveled s = 0.5 m

Initial velocity u = 0 m/sec

Acceleration of the block a=gsin\Theta =9.8\times sin25.7^{\circ}=4.243m/sec^2

From second equation of motion we know that S=ut+\frac{1}{2}at^2

So 0.5=0\times t+\frac{1}{2}\times 4.243\times t^2

t^2=0.2356

t = 0.4853 sec

So time taken by block to travel 0.5 m from rest will be 0.4853 sec

5 0
3 years ago
Identify the energy transformations in the image below:
Masteriza [31]

Answer:

B. Chemical to Electrical to Radiant

Explanation:

8 0
2 years ago
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