Which of the following accurately describes how a magnetic motor works a
A set of electric coils are placed in a magnetic field. When a current passes through the wire, it creates a reaction that causes the atoms to being to shift into place
b
A set of electric coils are placed in a magnetic field. When a current passes through them, they create a magnetic field which interacts with the first magnetic field, causing the set of coils to rotate
c
A set of magnets are placed in an electric field. As the current increases or decreases, the strength of the electric field changes, causing the magnet to be more or less moved by the field
d
A set of magnets are placed in an electric field. A current is run through the magnets, thus increasing their magnetic fields. Once the magnetic field is increased, the magnets can be manipulated by the electric field by being guided around

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Ответ:

jay0626

02.04.2020

Physics

8.04924 m/s²

Explanation:

r = Distance the child is from the center = 4.65 m

$\alpha$ = Angular acceleration = 0.745 rad/s²

$\omega$ = Angular velocity = 1.25 rad/s

Velocity is given by

$v=r\omega\\\Rightarrow v=4.65\times 1.25\\\Rightarrow v=5.8125\ m/s$

Radial acceleration is given by

$a_r=\frac{v^2}{r}\\\Rightarrow a_r=\frac{5.8125^2}{4.65}\\\Rightarrow a_r=7.265625\ m/s^2$

Tangential acceleration is given by

$a_t=\alpha r\\\Rightarrow a_t=0.745\times 4.65\\\Rightarrow a_t=3.46425\ m/s^2$

The resultant acceleration is given by

$a=\sqrt{a_r^2+a_t^2}\\\Rightarrow a=\sqrt{7.265625^2+3.46425^2}\\\Rightarrow a=8.04924\ m/s^2$

The magnitude of the acceleration of the child is 8.04924 m/s²

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