3 years ago

A lightbulb converts 10 percent of the electric energy it uses into radiant energy

Physics

1 answer:

katrin [286]3 years ago

7 0

The rest of it is used up as unwanted energy or wasted energy in forms of:
.heat
.noise

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Consider a spherical planet of uniform density rho. The distance from the planet's center to its surface (i.e., the planet's rad

alisha [4.7K]

Answer:

a) $g(r) = 4\pi \cdot G \cdot \rho\cdot r$ , b) $g = 4\pi \cdot G \cdot \rho\cdot r_{P}$

Explanation:

a) The acceleration due to gravity inside the planet is:

$dg = G\cdot \frac{\rho \cdot dV}{r^{2}}$

$dg = G\cdot \frac{4\pi\cdot \rho \cdot r^{2}\,dr}{r^{2}}$

$dg = 4\pi\cdot G\cdot \rho \,dr$

$g(r) = 4\pi \cdot G \cdot \rho\cdot r$

b) The acceleration at the surface of the planet is:

$g = 4\pi \cdot G \cdot \rho\cdot r_{P}$

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3 years ago

Electrons may be __________ or __________ other atoms.

jeka94

C. in a covalent bond, they are shared by two atoms, while in an ionic bond, they are transferred

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3 years ago

Electromagnetic waves travel at a speed of 3.0 x 108 m/s. A radio station transmits waves

Sophie [7]

Answer:

1.2×10⁶ Hz

Explanation:

Applying,

v = λf............. Equation 1

Where v = speed of wave, λ = wavelength, f = frequency.

make f the subject of the equation

f = v/λ............... Equation 2

From the question,

Given: v = 3.0×10⁸ m/s, λ = 2.5×10² m

Substitute these values into equation 2

f = 3.0×10⁸/2.5×10²

f = 1.2×10⁶ Hz

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3 years ago

A battery is connected to a light bulb that has 3 of resistance . If there is 0.5 A of current flowing what is the voltage on th

Alenkasestr [34]

Answer:

1.5 V

Explanation:

E = IR = 0.5(3) = 1.5 V

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Do single atoms emit electromagnetic radiation?

love history [14]

No atoms create electricity and radiation

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3 years ago