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Andreas93 [3]
3 years ago
5

How much of the electromagnetic spectrum is visible to us?

Physics
2 answers:
mihalych1998 [28]3 years ago
3 0
 we only see wavelengths from 400–700 nanometers.
Trava [24]3 years ago
3 0
We can only see a small part of a electromatic spectrum . We see visible light even though their are many lights we can't see like infrared light.
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The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity
AleksAgata [21]

Answer:

Power, P = 722.96 watts

Explanation:

It is given that,

Voltage, V = 120 V

Length of nichrome wire, l = 8.9 m

Diameter of wire, d = 0.86 mm

Radius of wire, r = 0.43 mm = 0.00043 m

Resistivity of wire, \rho=1.3\times 10^{-6}\ \Omega-m

We need to find the power drawn by this heater. Power is given by :

P=\dfrac{V^2}{R}

And, R=\rho\dfrac{l}{A}

P=\dfrac{V^2\times A}{\rho\times l}

P=\dfrac{120^2\times \pi (0.00043)^2}{1.3\times 10^{-6}\times 8.9}

P = 722.96 watts

So, the power drawn by this heater element is 722.96 watts. Hence, this is the required solution.    

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3 years ago
The balloon contain no gas initially.When it is connected to the cylinder gas enters the balloon the pressure in the cylinder de
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Answer:

17

Explanation:

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A car has a uniform velocity of 108km/h. How far does it travel in 30 seconds?​
natita [175]
  • Velocity=108km/h

Convert to m/s

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\\ \tt\longmapsto Distance=900m

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Which type of friction keeps a pile of rocks from falling apart?
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