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3 years ago

Why do we see only one side of the moon from earth?

Physics

2 answers:

soldier1979 [14.2K]3 years ago

4 0

Answer:

because the moons period of rotation and revolution are equal.

Anna11 [10]3 years ago

3 0

<span>We see only one side of the moon from earth because the moons period of rotation and revolution are equal. The moon rotates around the Earth at the exact speed as it rotates around its won axis (revolution). The result is: the same side of the moon is facing the Earth. If the moon doesn't rotate on it's axis we on the Earth would see all of the sides of the Moon.</span>

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Consider an electron with charge −e and mass m orbiting in a circle around a hydrogen nucleus (a single proton) with charge +e.

alexandr1967 [171]

Answer:

$v=\sqrt{k\frac{e^2}{m_e r}}$ , $2.18\cdot 10^6 m/s$

Explanation:

The magnitude of the electromagnetic force between the electron and the proton in the nucleus is equal to the centripetal force:

$k\frac{(e)(e)}{r^2}=m_e \frac{v^2}{r}$

where

k is the Coulomb constant

e is the magnitude of the charge of the electron

e is the magnitude of the charge of the proton in the nucleus

r is the distance between the electron and the nucleus

v is the speed of the electron

$m_e$ is the mass of the electron

Solving for v, we find

$v=\sqrt{k\frac{e^2}{m_e r}}$

Inside an atom of hydrogen, the distance between the electron and the nucleus is approximately

$r=5.3\cdot 10^{-11}m$

while the electron mass is

$m_e = 9.11\cdot 10^{-31}kg$

and the charge is

$e=1.6\cdot 10^{-19} C$

Substituting into the formula, we find

$v=\sqrt{(9\cdot 10^9 m/s) \frac{(1.6\cdot 10^{-19} C)^2}{(9.11\cdot 10^{-31} kg)(5.3\cdot 10^{-11} m)}}=2.18\cdot 10^6 m/s$

7 0

3 years ago

A 13-N east horizontal force acts in the same direction as a 6.4kg block as it slides 2.5m/s on a frictionless, horizontal surfa

MaRussiya [10]

Answer:

6.77 m/s

Explanation:

Acceleration = Force/mass;

The block is accelerated by 13/6.4 m/s^2 for 2.1s from an initial velocity of 2.5m/s.

Applying the equation of motion:

Vf=Vi + at

Where Vf is the final velocity, Vi is the initial velocity, a is the acceleration and t is the time for which the object accelerates.

8 0

3 years ago

Can someone please help? Thanks! The answer that I have marked is incorrect, im making corrections

artcher [175]

Answer: It is D.

Explanation:

The compass needle pointed in the direction of the current's magnetic field.

3 0

2 years ago

Read 2 more answers

A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall, and the other end is connec

Wewaii [24]

Answer:

Velocity = 0.4762 m/s

Explanation:

Given the details for the simple harmonic motion from the question as:

Angular frequency, ω = 12 rad/s

Amplitude, A = 0.060 m

Displacement, y = 0.045 m

The initial Energy = U = (1/2) kA²

where A is the amplitude and k is the spring constant.

The final energy is potential and kinetic energy

K + U = (1/2) mv² + (1/2) kx²

where x is the displacement

m is the mass of the object

v is the speed of the object

Since energy is conservative. So, the final and initial energies are equal as:

(1/2) k A² = (1/2) m v² + (1/2) kx²

Using, ω² = k/m, we get:

Velocity:

$v=\omega\times \sqrt{[ A^2 - y^2 ]}$

$v=\omega\times \sqrt{[ {0.06}^2 - {0.045}^2 ]}$

<u>Velocity = 0.4762 m/s</u>

4 0

3 years ago

Explain how the specific heat of water helps keep our bodies from overheating

choli [55]

This high specific heat of water prevents abrupt changes in temperature and helps the body maintain temperatures that are relatively constant.

5 0

3 years ago