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3 years ago

What is the direction of force of friction acting ona moving objec

Physics

1 answer:

PIT_PIT [208]3 years ago

4 0

The direction of the friction force is the same than the movement, but its sense is the opposite.

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3 years ago

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3 years ago

A motor keep a Ferris wheel (with moment of inertia 6.97 × 107 kg · m2 ) rotating at 8.5 rev/hr. When the motor is turned off, t

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Answer:

$P = 133.13 Watt$

Explanation:

Initial angular speed of the ferris wheel is given as

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$\alpha = \frac{\omega_f - \omega_i}{\Delta t}$

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$\alpha = 1.27 \times 10^{-4} rad/s^2$

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$\tau = I \alpha$

$\tau = (6.97 \times 10^7)(1.27 \times 10^{-4})$

$\tau = 8875.3 N m$

Now the power required to rotate it with initial given speed is

$P = \tau \omega$

$P = 8875.3 \times 0.015$

$P = 133.13 Watt$

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3 years ago

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3 years ago