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2 years ago

8

The specific heat of water is 4.19 x 103 J/kg°C. How much energy will it take to raise the temperature of 0.5 kg of water by 2 d

egrees?

1 answer:

fredd [130]2 years ago

5 0

Energy required = mass x specific heat x temperature difference
= 0.5 x 4.19x10^3 x 2
= 4190J

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The time delay between transmission and the arrival of the reflected wave of a signal using ultrasound traveling through a piece

Brilliant_brown [7]

Answer:

10.01 cm

Explanation:

Given that,

The time delay between transmission and the arrival of the reflected wave of a signal using ultrasound traveling through a piece of fat tissue was 0.13 ms.

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We need to find the depth when the reflection occur. We know that, the distance is double when transmitting and arriving. So,

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or

d = 10.01 cm

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1 year ago

A cord of mass 0.65 kg is stretched between two supports 8.0 m apart. If the tension in the cord is 120 N, how long will it take

DedPeter [7]

The time taken by the pulse to travel from one support to the other is 0.208 s.

<h3>Given:</h3>

The mass of the cord is m = 0.65 kg.

The distance between the supports is, d = 8.0 m.

The tension in the cord is T = 120 N.

The time taken by the pulse to travel from one support to the other is given as,

$v=\frac{d}{t}$

$t=\frac{d}{v}$

Here, v is the linear velocity of a pulse. Its value is,

$v=\sqrt{\frac{T d }{m} }$

$v=\sqrt{\frac{120 * 8}{0.65} }$

$v= 38.43 m/s$

Then,

$t=\frac{8}{38.43}$

$t=0.208 s$

Thus, the time taken by the pulse to travel from one support to the other is 0.208 s.

Learn more about tension here:

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Briefly explain the two postulates of relativity, how they differed from classical physics, and why Einstein was led to propose

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Explanation:

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Postulate 2: The velocity of light is remains same in each ans every frame of reference and independent of relativity.

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These two postulates implements in phenomenon like time dilation , length contraction etc.

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Things are rubbed against each other

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A) Touch it with a positively charged object

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