A hoist is used to lift a 780 kg car upward with an acceleration of 0.110 m/s. a) What is the net force acting on the car?
b) What force was used to lift the car?

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Ответ:

Loveekatiana

25.07.2021

Physics

C. 4Eki

Explanation:

The kinetic energy due to the rotation is:

$K = \frac{1}{2}\cdot I \cdot \omega^{2}$

The motion of the ice skater is modelled after the Principle of Angular Momentum Conservation:

$I_{o}\cdot \omega_{o} = I_{f}\cdot \omega_{f}$

The initial angular speed is:

$\omega_{o} = \sqrt{\frac{2\cdot E_{ki}}{I} }$

The final angular speed is:

$\omega_{f} = \frac{I_{o}}{I_{f}}\cdot \omega_{o}$

$\omega_{f} = 4\cdot \sqrt{\frac{2\cdot E_{ki}}{I} }$

The final kinetic energy is:

$K = \frac{1}{2}\cdot \left(\frac{1}{4}\cdot I \right)\cdot \left(\frac{32\cdot E_{ki}}{I} \right)$

$K = 4\cdot E_{ki}$

The correct answer is option C.

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A hoist is used to lift a 780 kg car upward with an acceleration of 0.110 m/s. a) What is the net force acting on the car? b) What force was used to lift the car?