Answer:
61578948 m/s
Explanation:
λ
= λ
![\frac{c+v_{o}}{c}](https://tex.z-dn.net/?f=%5Cfrac%7Bc%2Bv_%7Bo%7D%7D%7Bc%7D)
687 = 570 ![(\frac{3 * 10^{8} +v_{o} }{3 * 10^{8}} )](https://tex.z-dn.net/?f=%28%5Cfrac%7B3%20%2A%2010%5E%7B8%7D%20%2Bv_%7Bo%7D%20%7D%7B3%20%2A%2010%5E%7B8%7D%7D%20%29)
= 61578948 m/s
So Slick Willy was travelling at a speed of 61578948 m/s to observe this.
Answer:
The correct option is D
Explanation:
From the question we are told that
The speed of the first charge is ![v = 0 \ m/s](https://tex.z-dn.net/?f=v%20%20%3D%200%20%5C%20m%2Fs)
This is because it is at rest
The speed of the second charge is ![v = 10^{4} \ m/s](https://tex.z-dn.net/?f=v%20%20%3D%20%2010%5E%7B4%7D%20%5C%20m%2Fs)
Generally the force exerted by a magnetic field on a charge is mathematically represented as
![F_q = q * v * B sin \theta](https://tex.z-dn.net/?f=F_q%20%20%3D%20%20q%20%2A%20v%20%20%2A%20%20B%20sin%20%5Ctheta)
Now looking at this above equation we can see that
can only be maximum at
and this only obtained when the direction of the charge (i.e its velocity ) is perpendicular to the direction of the magnetic field
so the correct option for this question is D
Answer:
Explanation:
Mass of object = m
Height above planet = h
Mass of planet = M
Radius of planet = R
As we have to find out velocity, so let's apply the law of conservation of energies on initial( when the object was at height) and final( when object hit the surface points.
Initial energy = Final energy
![K_{i} + U_{i} = K_{f} + U_{f}](https://tex.z-dn.net/?f=K_%7Bi%7D%20%2B%20U_%7Bi%7D%20%3D%20K_%7Bf%7D%20%2B%20U_%7Bf%7D)
![\frac{1}{2}mv_{i} ^{2} - \frac{GMm}{h+R} = \frac{1}{2}mv_{f} ^{2} - \frac{GMm}{R}\\v_{i} = 0\\v_{f} ^{2} = 2\frac{GM}{R} - 2 \frac{GM}{h+R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7Dmv_%7Bi%7D%20%5E%7B2%7D%20%20-%20%5Cfrac%7BGMm%7D%7Bh%2BR%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dmv_%7Bf%7D%20%5E%7B2%7D%20%20-%20%5Cfrac%7BGMm%7D%7BR%7D%5C%5Cv_%7Bi%7D%20%3D%200%5C%5Cv_%7Bf%7D%20%5E%7B2%7D%20%3D%202%5Cfrac%7BGM%7D%7BR%7D%20-%202%20%5Cfrac%7BGM%7D%7Bh%2BR%7D)
![v_{f} =\sqrt{\frac{2GMh}{R(R+h)} }](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3D%5Csqrt%7B%5Cfrac%7B2GMh%7D%7BR%28R%2Bh%29%7D%20%7D)
Answer:
so birds have better tempatures
Explanation:
when a bird gets to cold in ny or somting it migrates over to floridia to become warmer because it does not snow in floridia
Answer:
Only B is correct.
Explanation:
Electrolysis and galvanic activity are two different ways of the passage of electricity. Electrolysis occurs at a spontaneous reaction, and galvanic activity needs an external force to happen.
For example, a cell works by a redox reaction, in which a material reduces (gain electrons), and the other oxides (loses electrons). As higher is the standard reduction potential of a material, as easy is to it to reduces. Thus, if a cell works with the reduction happens with the material with low standard reduction potential, then it works by galvanic activity.
When electronics are connected to the house system, it's necessary to do the ground connection, which will allow the electrons that are dissipated to go to the earth. So, it is done incorrectly, the electrons flow to the equipment, which they natural path. So, the electrolysis can occur with a poor ground connection.