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serg [7]
1 year ago
6

A substance that heats up relatively quickly has a :________

Physics
2 answers:
solniwko [45]1 year ago
7 0

Answer: B.

Explanation: trust me its B

Andreyy891 year ago
3 0
The answer is b! hope this helped
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Complete the first and second sentences, choosing the correct answer from the given ones.
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Hope this helps :)

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1. A

2. G (because the basic definition of internal energy is, the sum of kinetic and potential energies of water molecules)

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Why is disagreement among scientists important to the progress of science? Facing disagreement forces scientists to prove their
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Facing disagreement forces scientists to prove their theories more conclusively.
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Randomly assigning students to two different groups in an experiment on
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A circular loop of flexible iron wire has an initial circumference of 165.0cm, but its circumference is decreasing at a constant
djverab [1.8K]

Answer:

0.005 V

Explanation:

We are given that

Initial circumference of circular loop=C=165 cm

Rate of circumference,\frac{dC}{dt}=12 cm/s

Magnetic field,B=0.5 T

We have to find the induced emf at time t=9 s

We know that induced amf,E=\frac{Bd(A)}{dt}

Area of circular coil,A=\pi r^2

E=B\frac{d(\pi r^2)}{dt}=B(2\pi r)\frac{dr}{dt}

Circumference of circular coil,C=2\pi r

165=2\pi r

r=\frac{165}{2\pi}

\frac{dr}{dt}=\frac{1}{2\pi}\frac{dC}{dt}=\frac{1}{2\pi}\times (12)=\frac{6}{\pi} cm/s=\frac{6\times 10^{-2}}{\pi} m/s

Radius of coil at time t=9 s

r=\frac{165}{2\pi}-(\frac{6}{\pi}\times 9)=9.08 cm=9.08\times 10^{-2} m

1 m=100 cm

E=-0.5(2\pi\times 9.08\times 10^{-2})\times \frac{6\times 10^{-2}}{\pi}=-0.005 V

Magnitude of induced emf=0.005 V

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b - cake baking

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because the rest of the options are changing due to chemical reactions , when you bake a cake your developing it’s actions by touching it physically
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