1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kirza4 [7]
3 years ago
6

The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs func

tion in the same way.) Over a 133min playing time, the angular speed varies from 570rpm to 1600rpm .Assuming it to be constant, what is the angular acceleration (in/rads sec ) of such a DVD?
Physics
1 answer:
Kitty [74]3 years ago
8 0

Answer:

α = 0.0135 rad/s²

Explanation:

given,

t = 133 min = 133 x 60 = 7980 s

angular speed varies from 570 rpm to 1600 rpm

now,

570 rpm = 570 \times \dfrac{2\pi}{60}

              = 59.69 rad/s

1600 rpm =  = 570 \times \dfrac{2\pi}{60}

              = 167.6 rad/s

using equation of rotational motion

ωf = ωi + αt    

167.6 = 59.7 + α x 7980

α  x 7980 = 107.9

α = 0.0135 rad/s²

You might be interested in
An 80kg parachutist jumps out of an airplane. Neglecting air friction, how fast will he be going after a 10 second free fall?
olganol [36]
If he is jumping you are adding force which means that you will be falling twice as fast
6 0
3 years ago
a particle of mass m and charge q moving with velocity v in a magnetic field B. The velocity of the particle is perpendicular to
Lerok [7]

Explanation:

When a charged particle describes a circular path in a uniform magnetic field, the charged particle experiences a magnetic force  towards the center of circular path, according to Fleming's left hand rule. Therefore the magnetic force and velocity (tangent to circular path) are perpendicular to each other during the circular motion. As the direction of displacement, is the direction of velocity, hence force and displacement are perpendicular to each other.

Therefore work done by magnetic force,

                                         W=Fscos90=0

3 0
3 years ago
These clouds appear long, flat, and spread across the sky.
photoshop1234 [79]
I think the answer is Cirrus. They are flat feathery clouds that usually stretch long distances over the sky.
4 0
3 years ago
Read 2 more answers
Which statements belong to dalton's atomic theory? select all that apply
kvv77 [185]

The answers would be:

3. Atoms cannot be broken down into smaller pieces (or indivisible)

4. All atoms of an element are identical.

5. Chemical reactions cause atoms to be rearranged.

Although all of the statements regarding atoms are true, because of the technology during Dalton's time, the others were not yet discovered. As time progressed modifications were made which built our modern atomic theory.

3 0
3 years ago
Read 2 more answers
Based on what you’ve learned from the raisin cake analogy, which two properties of distant galaxies do astronomers have to measu
Kisachek [45]
Here is the answer to the given question above. Based on the Raisin Cake Analogy, the two properties of distant galaxies that astronomers have to measure to show<span> that we live in an expanding universe are DISTANCE and SPEED. Hope this answers your question. Have a great day!</span>
4 0
4 years ago
Other questions:
  • three neutral metal cans mounted on isulating stands are touching a negatively charge ballon is brought near can a can b is then
    14·1 answer
  • Four hundred seventy joules of heat are removed from a heat reservoir at a temperature of 470 K. What is the entropy change of t
    11·2 answers
  • Which is an example of gaining a static charge by conduction?
    11·1 answer
  • What temperature increase is necessary to increase the power radiated from an object by a factor of 8?
    11·1 answer
  • A 2.0 kg ball and a 3.5 kg ball, each moving at 0.90 m/s, undergo a head-on collision. The lighter ball rebounds opposite its in
    6·1 answer
  • If a wave vibrates back and forth three times each second, and its wavelength is 2 meters, what is its frequency
    11·1 answer
  • PLZZ HELP
    10·2 answers
  • A cat is moving at 18 m/s when it accelerates at 4 m/s2 for 2 seconds. What is his
    10·1 answer
  • An 1120 kg car traveling at 17.2 m/s is brought to a stop while skidding 40m. Calculate the work done on the car by the friction
    12·1 answer
  • How do I calculate equilibrant and fx and fy. I don't understand what they are asking
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!