3 years ago

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Physics

1 answer:

Alex73 [517]3 years ago

5 0

I'm not sure what you were trying to put here

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The voltage between the cathode and the screen of a television set is 22 kV. If we assume a speed of zero for an electron as it

il63 [147K]

Answer:

v= 8.8*10⁷ m/s

Explanation:

Assuming no friction present, the change in electrical potential energy, must be equal in magnitude, to the change in kinetic energy of the electron.
The change in the electrical potential energy, can be expressed as follows:

$\Delta U = (-e)*\Delta V$

The change in kinetic energy, assuming that the electron started from rest, can be written as follows:

$\Delta K = \frac{1}{2} *m*v^{2}$

⇒ $\Delta K = -\Delta U$

From the equation above, replacing by ΔK and ΔU, we have:

$-\Delta U =- (-e)*\Delta V =\Delta K = \frac{1}{2} *m*v^{2}$

Solving for v:

$v=\sqrt{\frac{2*e*\Delta V}{m_{e}} } =\sqrt{\frac{2*1.6e-19C*22e3V}{9.1e-31kg}} }\\ v= 8.8e7 m/s$

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3 years ago

Which Particle in an atom has a positive charge?

tester [92]

Answer:

Protons

Explanation:

3 0

3 years ago

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The specific heat of Aluminum is 0.9 J/g K. How much heat is lost as a 100 gram sample of Aluminum is dropped into a beaker of w

otez555 [7]

Energy=mass*SHC*temp change
=100*0.9*75
=6750J

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4 years ago

Why cant the moon be eclipsed when it is halfway between the nodes of its orbit?

Eddi Din [679]

The reason why the moon can't be eclipsed when it's halfway between the nodes of the orbit because the moon's orbit is at it's maximum deviation, meaning that it is leaving it's course from the sun's path, which would make the shadow fall way below or above the moon. Because of that, the moon can't eclipsed.

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4 years ago

What is the mass of an object that weighs 686N on Earth?

madreJ [45]

Answer:

70 kg

Explanation:

F=m•a

m=F/a

m= 686/9,8= 70kg

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4 years ago