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4 years ago

Photons are also known as beta particles. (true or false)

Physics

1 answer:

Llana [10]4 years ago

5 0

No. Beta particles are electrons.

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The water in the plumbing in a house is at a gauge pressure of 300,000 pa. What force does this cause on the top of the tank ins

liraira [26]

Answer:

60 000 N

Explanation:

1 pa = 1 N/m^2

you have 300 000 of these = 300 000 N /m^2

but only an area of .2 m^2

300 000 N / m^2 * .2 m^2 = 60 000 N

3 0

2 years ago

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

Ze is the charge of the nucleus

e is the charge of the electron

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:

$F=m\frac{v^2}{r}$ (2)

where

m is the mass of the electron

v is the speed of the electron

Combining the two equations (1) and (2), we find

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

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

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

6 0

3 years ago

State what is meant by a gravitational potential at point A is -1·70 × 109 J kg-1.

alex41 [277]

Answer:

The energy stored in a body due to either it's position or change in shape is called gravitational potential energy.

8 0

3 years ago

A scientific hypothesis must be

galben [10]

A scientific hypothesis must be testable, but there is a much stronger requirement that a testable hypothesis must meet before it can really be considered <span>scientific</span>

3 0

3 years ago

What is Bernoulli's principle???

maks197457 [2]

The Bernoulli's principle is <span>the principle in hydrodynamics that an increase in the velocity of a stream of fluid results in a decrease in pressure.</span>

7 0

4 years ago