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rjkz [21]
4 years ago
10

When a fork is placed in a hot piece of lasagna, thermal energy is transferred up the fork by

Physics
2 answers:
Zinaida [17]4 years ago
8 0

Answer:The thermal energy gets transferred to fork from lasagna by the means of<u><em> Thermal conduction.</em></u>

Explanation:

Thermal conduction is defined as movement of heat from hotter object to cooler object when they touching each other.The movement of heat is due to particle collision and movement of electrons within a substance.

Same is happening in the case when we place fork in hot lasagna due to which fork gets warm.

kirill [66]4 years ago
6 0
<span>fast-moving particles colliding with slow-moving particles</span>
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Suppose you want to whisper to the student next to you in class, what must you remember to do with your vocal cords
Juliette [100K]
You have to lower you vocals
7 0
4 years ago
A proton, mass 1.67 × 10−27 kg and charge +1.6 × 10−19 c, moves in a circular orbit perpendicular to a uniform magnetic field of
stellarik [79]

Time taken by proton to complete one complete circular orbit= 7.28 x 10⁻⁸ s

Explanation:

For proton, the centripetal force required for circular motion is provided by the magnetic force,

so Fm= Fc

q v B = m v²/r

m= mass of charged particle

v= velocity

B =magnetic field

q= charge

r= radius of circular path

v= q B r/m

now v= r ω

ω= angular velocity

ω r = q B r /m

ω=q B /m

now ω= 2π/T where T =time period

so 2π/T=q B/m

T= 2 πm/q B

T= 2π (1.67 x 10⁻²⁷)/ [( 1.6 x 10⁻¹⁹)* (0.9)]

T= 7.28 x 10⁻⁸ s

6 0
3 years ago
The speed of light is now defined to be c=2.99792458x10^8 m/s. Express the speed of light to three significant figures
Helga [31]
Easy. All you need to do us to is to shorten the number so that it only contains 3 digits. Change 2.9979248 to 2.99. Don't forget to round the number to the last possible digit. In this case, 2.997 would round to 3.00

So the answer would be 3.00x10^8.

Why?

Well, every non-0 number to the left of the decimal point will count as a significant figure. And every number to the right of the decimal point, whether it's 0 or not, will also count as a significant figure.

The 3 to the left of the decimal point and the 2 0s to the right will add up to 3 significant figures.
4 0
4 years ago
A block is pushed across a rough horizontal surface from point A to point B by a force P. The magnitude of the force of friction
DochEvi [55]

Answer:

The workdone by P is W_p=2.2J

Explanation:

Generally workdone is mathematically represented as

              W = F *d

Where F is the force and d is the distance

  The total workdone = (Workdone by Force P + Workdone by frictional force )

The difference in kinetic energy

                \Delta KE  = KE_2 - KE_1

Substituting 5.6 J for KE_1 and 4.0 J for KE_2

              \Delta KE = 5.6 - 4

                         = 1.6J

This change in kinetic energy of the block = The total kinetic energy

       The workdone by the frictional force is

                  W_F = -F_f * d

the negative sign shown that the force is moving in the opposite direction

substituting 1.2 N for F_f  and 0.5 m for d

               W_F = -1.2*0.5

                     =-0.6J

Making Workdone by Force P the subject in the above equation we

            Workdone by Force P (W_P) = The total workdone(W_T)  - W_F

Substitution values

                    W_p = 1.6 -(-0.6)

                          W_p=2.2J

                   

                           

     

                 

4 0
3 years ago
A He–Ne laser illuminates a narrow, single slit that is 1850 nm wide. The first dark fringe is found at an angle of 20.0∘ from t
egoroff_w [7]

Answer:

Wavelength of light will be 632.73 nm

Explanation:

We have given width of the single slit d=1850nm-1850\times 10^{-9}m

Angle is given as \Theta =20^{\circ}

We have to find the wavelength of light for first dark fringe

We know that for dark fringe it is given that

dsin\Theta =n\lambda

For first fringe n = 1

So 1850\times 10^{-9}\times sin20^{\circ} =1\times \lambda

\lambda =632.73nm

3 0
3 years ago
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