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tekilochka [14]
3 years ago
10

A shell is fired from the ground with an initial speed of 1500m/s at an angle of 35 degrees to the horizontal. Neglecting air re

sistance, find
a. the shell's horizontal range

b. the amount of time the shell is in motion
Physics
1 answer:
erik [133]3 years ago
6 0

Answer:

the shells horizontal is in the motion

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an electrical generator is an important component in a power plant. which best shows the energy transfer diagram for a generator
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Answer:The answer is B

Explanation:

A generator produces electricity. Energy enters the system (generator) as kinetic energy. It is converted into electrical energy, which can run electrical appliances. Some energy is always wasted as heat and sound. Therefore, Choice B is the best answer.

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An electron with charge −e and mass m moves in a circular orbit of radius r around a nucleus of charge Ze, where Z is the atomic
shepuryov [24]

Answer:

v=\sqrt{\frac{kZe^2}{mr}}

Explanation:

The electrostatic attraction between the nucleus and the electron is given by:

F=k\frac{(e)(Ze)}{r^2}=k\frac{Ze^2}{r^2} (1)

where

k is the Coulomb's constant

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r is the distance between the electron and the nucleus

This electrostatic attraction provides the centripetal force that keeps the electron in circular motion, which is given by:

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k\frac{Ze^2}{r^2}=m\frac{v^2}{r}

And solving for v, we find an expression for the speed of the electron:

v=\sqrt{\frac{kZe^2}{mr}}

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