4 years ago

How he will move in terms of the forces acting on him

1 answer:

6 0

A ball is moving upwards and rightwards towards its peak. The ball .... since the only horizontal force acting upon it is a "left-ward" force.

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The rating of a light bulb at 100 watts indicates

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That marking means that when the expected voltage is connected
between the two contacts of the bulb, it will dissipate 100 joules of
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4 years ago

URGENT: Testing shows that a sample of wood from an artifact contains 50% of the

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3 years ago

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3 years ago

A power station burns 75 kilograms of coal per second. Each kg of coal contains 27 million joules of energy.

Kaylis [27]

Answer:

Explanation:

a )

one kg of coal gives energy of 27 x 10⁶ J

75 kg of coal gives energy of 27 x 10⁶ x 75 J

So rate which energy is coming out of coal per second

= 27 x 10⁶ x 75 J

= 2025 x 10⁶ J /s

2025 million watts .

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efficiency = (800 / 2025) x 100

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3 years ago

Electrons of wavelength 1.5 nm are emitted from a material when light of wavelength 350nm is incident on it. What is the work fu

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3.5434 eV

Explanation:

For a particle with kinetic energy E and mass m , the wavelength associated is given by the following relation,

$\lambda=\frac{h}{\sqrt{2mE} }$

E = $\frac{h^2}{2m\lambda^2}$

Putting the values we get

E = $\frac{(6.6\times(10^{-34})^2}{2\times9.1\times10^{-31\times(1.5\times10^{-9})^2}}$

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= .0066 eV.

Energy of¹light in terms of eV

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Work function = 3.55 - 0.0066 = 3.5434 eV.

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4 years ago