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Troyanec [42]
3 years ago
12

yami pours powdered cocoa mix into milk and stirs it. then she microwaves the mixture for three minutes. when she takes the cup

out, the handle is very warm. steam rises from the cup, so she blows it before taking a sip. in which part of this scenario can convection be best observed
Physics
2 answers:
MrRa [10]3 years ago
6 0
Convection can best be observed as she blows the warm steam air that rises.

As the warm steam rises,  she forces displaces it with cool air from her mouth. Because the warm steam is less dense it rises and because the cool air is more dense, it displaces the warm air.

This scenario is an example of convection.
 
MArishka [77]3 years ago
4 0

The correct answer is:

C. Rising steam from the cup of cocoa.

Rising steam from the cup of cocoa is the part of this scenario that convection can be best observed.

|Huntrw6|

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A tugboat tows a ship with a constant force of magnitude F1. The increase in the ship's speed during a 10 s interval is 5.0 km/h
Ratling [72]

Answer

given,

time  = 10 s

ship's speed = 5 Km/h

F = m a

a is the acceleration and m is mass.

In the first case

F₁=m x a₁

where a₁ =  difference in velocity / time

F₁ is constant acceleration is also a constant.

Δv₁ = 5 x 0.278

Δv₁ = 1.39 m/s

a_1=\dfrac{1.39}{10}

a₁ = 0.139 m/s²

F₂ =m x a₂

F₃ = F₂ + F₁

Δv₃ = 19 x 0.278

Δv₃ = 5.282 m/s

a₃=Δv₂ / t

a_3=\dfrac{5.282}{10}

a₃ = 0.5282 m²/s

m a₃=m a₁ + m a₂

a₃ = a₂ + a₁

0.5282 = a₂ + 0.139

a₂=0.3892 m²/s

F₂ = m x 0.3892...........(1)

F₁ = m x 0.139...............(2)

F₂/F₁

ratio = \dfrac{0.3892}{0.139}

ratio = 2.8

6 0
4 years ago
A 1500-nF capacitor with circular parallel plates 2.0 cm in diameter is accumulating charge at the rate of 40.0 mC/s at some ins
Delvig [45]

Answer:

B= 1.14 X 10^{-7} Tesla

Explanation:

B at point 7.0 cm radially outward is to find out?

Now for field strength in case of parallel plates in given as

        B=\frac{I\mu}{2r\pi}

        B=\frac{4\pi X 10^{-7} \frac{Tm}{A}X40 X10^{-3} \frac{C}{s}}{2X0.07mX\pi}

      B= 1.14 X 10^{-7} Tesla

For the second part as Capacitor is fully charged no more flow of current could take place hence

I= Current =o

so B = 0

6 0
3 years ago
The planets that orbit the sun are large enough that their gravity produces a<br> ________ shape.
marishachu [46]

Answer:

a round shape. It has its own gravity to pull itself into a round shape

6 0
3 years ago
Parallel conducting wires carrying currents in the same direction repel each other.
S_A_V [24]

Answer:

False

Explanation:

The direction of magnetic field on a current carrying conductor can be determined by the Fleming's right hand rule where

  • The thumb represents the direction of motion
  • the index finger represents the direction of field.
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When two conductors carrying currents flowing in opposite direction, the magnetic field will be in the same direction hence they will repel.

<u><em>When the currents in them flow in same direction, then it means the magnetic field will be opposition and there will be a force of attraction between the conductors.</em></u>

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3 years ago
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3 0
3 years ago
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