Physics, 11.12.2019 06:31 christi05

An optical disk drive in a computer can spin a disk at up to 10,000 rpm. if a particular disk is spun at 7570 rpm while it is being read, and then is allowed to come to rest over 0.435 s, what is the magnitude of the average angular acceleration of the disk?

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Answer from: baneenbilal8510

The magnitude of the average angular acceleration is calculated as $1822.36\ rad/s^{2}$

Explanation:

Maximum speed that can be attained by the disk, $N_{m}$ = 10,000 rpm

Speed of spinning of the disk, N = 7570 rpm

Time taken to come to rest, t = 0.435 s

Now,

The initial angular velocity is given by:

$\omega = \frac{2\pi N}{60} = 792.73\ rads^{-1}$

Final angular velocity, $\omega' = 0\ rads^{- 1}$

The average angular acceleration of the disk can be computed by using the kinematic eqn:

$\omega' = \omega + \alpha t$

$0 = 792.73 + 0.435\alpha$

$\alpha = - 1822.36\ rads^{- 2}$

Answer from: xlxJazmin

$1822.36\ rad/s^2$

Explanation:

given,

speed of the disk = 7570 rpm

time of rest of the disk = 0.435 s

average angular acceleration = ?

initial speed of disk = 7570 rpm

= $7570 \times \dfrac{2\pi}{60}$

= $792.73\ rad/s$

final angular velocity = 0 rad/s

average angular acceleration = $\dfrac{\omega_f-\omega_i}{t}$

= $\dfrac{0 -792.73}{0.435}$

= $1822.36\ rad/s^2$

the average angular acceleration = $1822.36\ rad/s^2$

Answer from: Quest

A) acceleration. this seems to be the one that makes sense.

Answer from: Quest

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol

b. a hockey puck sliding across the ice

c. a compressed spring

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice is the correct option.

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