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3 years ago

Acceleration; F = - F

Physics

1 answer:

liubo4ka [24]3 years ago

7 0

Answer:

18N is the net force

Explanation:

Since friction always acts in the opposite direction of an objects motion we subtract the applied force from the frictional force to get our resultant net force of 18N.

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30 points 2 questions HELP!!

salantis [7]

Answer:

Generally with successive half-life a new element is formed from the decayed nuclei:

isotope - daughter nucleus has same no. of protons (same atomic number) so the same element is formed in the decay

isotone - daughter nucleus has same number of neutrons so the atomic number has changed and a new element is formed (new atomic number)

isobar - daughter nucleus has same mass number - this could be an example of beta decay where the decayed nucleus has the same mass number but loses a neutron and gains a proton because of the lost electron and a new element is formed with the atomic number increases by 1

Example:

U238 Uranium - alpha to Th234

Th234 Thorium - 2 beta to U234 (back to U but atomic mass less by 4)

U234 Uranium - alpha to Th230

Th230 Thorium - alpha to Ra226

etc. but during beta decay (electron loss) a neutron is lost and a proton gained (answer a)

3 0

3 years ago

An electron initially 3.00 m from a nonconducting infinite sheet of uniformly distributed charge is fired toward the sheet. The

Cloud [144]

Answer:

$4.4443704375\times 10^{-18}\ C/m^2$

Explanation:

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

$\Delta l$ = Distance charge traveled = 2 m

v = Velocity of electron = 420 m/s

E = Electric field

$m_e$ = Mass of electron = $9.11\times 10^{-31}\ kg$

$q_e$ = Charge of electron = $1.6\times 10^{-19}\ C$

As the energy of the system is conserved we have

$q_eE\Delta l=\dfrac{1}{2}m_ev^2\\\Rightarrow E=\dfrac{1}{2}\dfrac{m_e}{q_e}\times \dfrac{v^2}{\Delta l}\\\Rightarrow E=\dfrac{1}{2}\dfrac{9.11\times 10^{-31}}{1.6\times 10^{-19}}\times \dfrac{420^2}{2}\\\Rightarrow E=2.51094375\times 10^{-7}\ N/C$

For an infinite non conducting sheet electric field is given by

$E=\dfrac{\sigma}{2\epsilon}\\\Rightarrow \sigma=2E\epsilon\\\Rightarrow \sigma=2\times 2.51094375\times 10^{-7}\times 8.85\times 10^{-12}\\\Rightarrow \sigma=4.4443704375\times 10^{-18}\ C/m^2$

The surface charge density is $4.4443704375\times 10^{-18}\ C/m^2$

5 0

3 years ago

Based on the daughter in figure 1 is mixture see a homogeneous or heterogeneous mixture explain

stiks02 [169]

<span>A homogeneous mixture would be something like a solution, where you can't see the different parts of the mixture. It's like how in salt water, you see one uniform substance (the water).
A heterogeneous mixture is the opposite; you can see the different parts that make it up. An example would be soil, where you can see rocks and leaves and the parts that make it up, etc</span>

8 0

3 years ago

Which is carried by waves?

Alex787 [66]

Answer:

Waves carry energy from one place to another. Because waves carry energy, some waves are used for communication, eg radio and television waves and mobile telephone signals. Some types of waves need to be transmitted through matter, either a solid, liquid or a gas. For example, water waves have to travel in water.

5 0

3 years ago

Read 2 more answers

A Michelson interferometer uses light with a wavelength of 452.446 nm. Mirror M2 is slowly moved a distance x, causing exactly 2

I am Lyosha [343]

Answer:

Option b. Dark spot

Explanation:

Michelson interferometer gives the path difference of the light as path difference, d as twice the distance moved or covered by the mirror $M_{2}$ , x and is given as:

d= 2x

Since, its an even multiple, we obtain a bright fringe

now, when the move half the distance, i.e., $\frac{x}{2}$

Therefore, the path difference for half the distance $\frac{x}{2}$ is:

d = x

As it is clear that its an odd multiple which correspond to dark spot as the final image

3 0

4 years ago