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pickupchik [31]
3 years ago
9

A block of copper (c = 390 J/kg°C) is heated from 20.0 C to 60.0 C. How much heat (in J) is absorbed by the copper if its mass i

s 45.0 g?
Physics
1 answer:
maria [59]3 years ago
3 0
Q=cm x change in t
Q= (390 J/kg C) x (0.045 kg) x (40.0 C)
Q= 702 J
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Determine the index of refraction of glass that is struck by unpolarized light at 53.8 degrees and resulting in a fully polarize
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Answer:

The refractive index of glass, \mu_{g} = 1.367

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Brewster angle is the special case of incident angle that causes the reflected and refracted rays to be perpendicular to each other or that angle of incident which causes the complete polarization of the reflected ray.

To determine the refractive index of glass:

tan\theta_{P} = \frac{\mu_{g}}{\mu_{a}}                 (1)

where

\mu_{a} = refractive index of glass

\mu_{g} = refractive index of glass

Now, using eqn (1)

tan{53.8^{\circ}} = \frac{\mu_{g}}{1}

\mu_{g} = tan53.8^{\circ}

\mu_{g} = 1.367

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Suppose you were bungee jumping from a bridge while blowing a hand-held air horn. How would someone remaining on the bridge hear
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Answer:

The pitch will progressively lower

Explanation:

If i were bungee jumping from  a bridge while blowing a hand-held air horn and someone who remains on the bridge will hear a decreased pitch or frequency as the source is moving away from the stationary listener as per the Dooplers effect. Hence, the pitch will progressively lower as the source is moving away from the observer.

4 0
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Which layer in the image above represents the layer of the Earth composed of liquid metal? *
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If two charged objects in a laboratory are brought to a distance of 0.22 meters away from each other. What is
zysi [14]

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q_2=2.47\times 10^{-4}\ C

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Let q₂ is the charge on the other sphere. The electrostatic force between two charges is given by the formula as follows :

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This question can be solved using the concept of friction energy.

The thermal energy change is b "258.4 J".

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Learn more about friction energy here:

brainly.com/question/1343045?referrer=searchResults

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