An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad/s). if a particular disk is spun at 646.1 rad/s while it is being read, and then is allowed to come to rest over 0.569 seconds, what is the magnitude of the average angular acceleration of the disk?

Angular acceleration will be

Explanation:

We have given initial angular speed of a particular disk

And it finally comes to rest so final angular speed

Time is given as t = 0.569 sec

From third equation of motion we know that

So angular acceleration

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

measuring things 1 litre of water