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aleksley [76]
3 years ago
14

Why do we say that a spring is elastic? Why do we say that a spring is elastic? It does not obey Hooke's law. When deformed, it

returns to its original shape. It is made of rubber. When deformed, it does not return to its original shape.
Physics
1 answer:
borishaifa [10]3 years ago
4 0

Answer:

When deformed, it returns to its original shape

Explanation:

  • A spring is elastic.  
  • Elasticity is the property of a material to regain its shape after having been deformed.
  • It means that when the force is doubled, the amount of deformation in it gets doubled.
  • Hence, the correct option is (b) " When deformed, it returns to its original shape".
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A wheel with moment of inertia 25 kg. m2 and angular velocity 10 rad/s begins to speed up, with angular acceleration 15 rad/sec2
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Answer:

(A) Angular speed 40 rad/sec

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Explanation:

We have given moment of inertia of the wheel I=25kgm^2

Initial angular velocity of the wheel \omega _0=10rad/sec

Angular acceleration \alpha =15rad/sec^2

(a) We know that \omega =\omega _0+\alpha t

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So \omega =10+15\times  2=40rad/sec

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(b) After 3 sec \omega =10+15\times 3=55rad/sec

We know that kinetic energy is given by Ke=\frac{1}{2}I\omega ^2=\frac{1}{2}\times 25\times 55^2=37812.5J

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What is the kinetic energy of a 150 gram object moving at a velocity of 100 m/s?
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Answer:

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Explanation:

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