B is the most correct. This comes from Lorentz's Force Law: F = q(E+ v x B), where F is force, q is charge, E is the magnitude of the electric field, v is the velocity of the particle and B is the magnitude of the magnetic field. If we examine the v x B term (this is the only term the magnetic field contributes to), we know that the cross product will equal zero if v is zero (if the charge is stationary). If you're not terribly comfortable with cross products, change v x B into v*B*sinθ, where θ is the angle between the v and B vectors. This simplification also forces you to use the right hand rule to find the resulting direction of the cross product, but makes the math more straight forward. A is incorrect because ALL charged particles create magnetic fields that also exercise force on the particle. For C, while the force does get bigger with higher velocity, it isn't straightly multiplied, more closely it multiples the magnetic field, B, and that generates more force, but even then we only purely multiply v and B when the angle between them (θ) is 90°, so sinθ = 1 and that term disappears. D is wrong because the magnetic force on a stationary charged particle is zero, always, and when it is moving it is non-zero.
Average acceleration = (change in speed) / (time for the change)
In this case . . .
Average acceleration = (speed at the end - speed at the beginning)/10sec.
We can't be any more specific without knowing the difference
between the beginning speed and the ending speed.
Answer:
Ek = 196.2 [J]
Explanation:
The question concerns the KE kinetic energy.
That is, we must find the kinetic energy at the moment the cannon is fired and the kinetic energy of when the ball hits the ground after having fallen 20 meters.
At the moment when the ball is fired it is 20 meters above ground level. If the ground level is taken as the reference level of potential energy, where it is equal to zero, in this way when the ball is at the highest (20 meters) you have the maximum potential energy.
In this way, the energy in the initial state is equal to the sum of the kinetic energy plus the potential energy. As the energy is conserved this same energy will be present when the ball hits the ground, where the potential energy is zero and will have only kinetic energy.
The kinetic energy in the initial state can be easily calculated by means of the following equation.
Therefore the change in KE
Answer:
<em>A = 0.05 V</em>
Explanation:
<u>Sinusoidal Functions</u>
A sinusoid or sinusoidal function is a sine or cosine which general equation is
Or also
Where A is the amplitude or maximum value, w is the angular frequency, t is the time and is the phase shift.
Comparing the given expression with the general formula
We can establish that A=50 mV = 0.05 V
Answer:
b.
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