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valina [46]
3 years ago
14

Help me on this question

Physics
1 answer:
nikitadnepr [17]3 years ago
6 0
Adjust the height of the wooden rod so that it just touches the surface of the water. Switch on the lamp and motor and adjust the speed of the motor until low frequency waves can be clearly observed... Count the number of waves passing a point in ten seconds then Divide by ten to record frequency.
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The filament of an incandescent light bulb is made of tungsten which has a thermal coefficient of resistivity of α = 4.4 x 10-3
grandymaker [24]

Answer:

The current when the filament at room temperature is 11.84 A.

Explanation:

Given that,

Thermal coefficient of resistivity \alpha=4.4\times10^{-3}\ K^{-1}

Initial temperature = 293 K

Voltage = 140 Volt

Final temperature = 2900 K

Current = 0.95 A

Suppose we find the numerical value of the current when the filament is at room temperature

So, We use the equation of resistance of a material changes with temperature

R=R_{0}(1+\alpha(T_{2}-T_{1}))....(I)

Using ohm's law for value of resistance

V = I R

R = \dfrac{V}{I}

Put the value of resistance in the equation (I)

\dfrac{V}{I}=\dfrac{V}{I_{0}}(1+\alpha(T_{2}-T_{1}))

I_{0}=I(1+\alpha(T_{2}-T_{1}))

Put the value into the formula

I_{0}=0.95(1+4.4\times10^{-3}(2900-293))

I_{0}=11.84\ A

Hence, The current when the filament at room temperature is 11.84 A.

7 0
3 years ago
What are the advantages of having a roof with a lower thermal conductivity?
Paul [167]

Answer:

less energy is needed to heat the house

the roof is a better insulator

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explain why if charge cannot be created or destroyed, electrically neutral objects can become electrically charged
natali 33 [55]
Charge is actually either excessive number or electrons or shortage of them.
as you can't destroy the electron or create it - you can't destroy or create charge 

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3 years ago
A 0.59 kg bullfrog is sitting at rest on a level log. how large is the normal force of the log on the bullfrog?
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<span>The bullfrog is sitting at rest on the log. The force of gravity pulls down on the bullfrog. We can find the weight of the bullfrog due to the force of gravity. weight = mg = (0.59 kg) x (9.80 m/s^2) weight = 5.782 N The bullfrog is pressing down on the log with a force of 5.782 newtons. Newton's third law tells us that the log must be pushing up on the bullfrog with a force of the same magnitude. Therefore, the normal force of the log on the bullfrog is 5.782 N</span>
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According to the Declaration, when do people have a right to revolution?
babunello [35]
Locke said that under natural law, all people have the right to life, liberty, and private property; under the social contract, the people could instigate a revolution against the government when it acted against the interests of citizens, to replace the government with one that served the interests of citizens.
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