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2 years ago

The diagram shows a positive charge moving in a magnetic field.

Physics

2 answers:

lesya [120]2 years ago

9 0

Answer:

Direction of force = Upwards

Explanation:

As we know that force on a moving charge in magnetic field is given by

$\vec F = q(\vec v \times \vec B)$

now here we can see that positive charge is moving towards left in magnetic field which is coming out of the plane

so here

$\vec v = v(-\hat i)$

$\vec B = B\hat k$

now by solving the equation we have

$\vec F = q(v(-\hat i) \times B\hat k)$

$\vec F = qvB \hat j$

so the force is along +Y direction that is upwards

slavikrds [6]2 years ago

6 0

By the right hand rule the magnetic force on the charge acts up

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You stand on a frictional platform that is rotating at 1.8 rev/s. Your arms are outstretched, and you hold a heavy weight in eac

dusya [7]

Answer:

20.62361 rad/s

489.81804 J

Explanation:

$I_i$ = Initial moment of inertia = 9.3 kgm²

$I_f$ = Final moment of inertia = 5.1 kgm²

$\omega_i$ = Initial angular speed = 1.8 rev/s

$\omega_f$ = Final angular speed

As the angular momentum of the system is conserved

$I_i\omega_i=I_f\omega_f\\\Rightarrow \omega_f=\dfrac{I_i\omega_i}{I_f}\\\Rightarrow \omega_f=\dfrac{9.3\times 1.8}{5.1}\\\Rightarrow \omega_f=3.28235\ rev/s=3.28235\times 2\pi=20.62361\ rad/s$

The resulting angular speed of the platform is 20.62361 rad/s

Change in kinetic energy is given by

$\Delta K=\dfrac{1}{2}(I_f\omega_f^2-I_i\omega_i^2)\\\Rightarrow \Delta K=\dfrac{1}{2}(5.1\times (20.62361)^2-9.3\times (1.8\times 2\pi)^2)\\\Rightarrow \Delta K=489.81804\ J$

The change in kinetic energy of the system is 489.81804 J

As the work was done to move the weight in there was an increase in kinetic energy

6 0

3 years ago

Which expression of distance uses SI units? A. 30 miles B. 16 kilograms C. 24 feet D. 500 meters

Stella [2.4K]

Hi!

SI units are physical measurements which will be in the form of kilograms, second, kelvin, metres, etc.

Since kilograms measure the weight of an object, it is out. Miles and feet are not SI units, so they are also out. This only leaves one answer left!

Hopefully, this helps! =)

7 0

3 years ago

Read 2 more answers

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Mars2501 [29]

Answer with Explanation:

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