Answer:
The helicopter was deformed and destroyed in the inelastic collision.
Explanation:
- When two object collide there exist two way of colliding: elastic collision and inelastic collision.
- Two terms are considered during the collision: kinetic energy and momentum.
- If both of these terms are conserved in any collision then there is no significant loss of property, this is called as elastic collision.
- If only momentum is conserved but kinetic energy is converted into other forms then it is inelastic collision. In inelastic collision, the energy is lost in the form of vibration, sound etc. causing the damage to colliding object.
- Hence the deformation of helicopter was due to inelastic collision.
Answer:
h = 4.04 m
Explanation:
Given that,
Mass of a child, m = 25 kg
The speed of the child at the bottom of the swing is 8.9 m/s
We need to find the height in the air is the child is able to swing. Let the height is h. Using the conservation of energy such that,
![mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}](https://tex.z-dn.net/?f=mgh%3D%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%5C%5C%5C%5Ch%3D%5Cdfrac%7Bv%5E2%7D%7B2g%7D)
Put all the values,
![h=\dfrac{(8.9)^2}{2\times 9.8}\\\\h=4.04\ m](https://tex.z-dn.net/?f=h%3D%5Cdfrac%7B%288.9%29%5E2%7D%7B2%5Ctimes%209.8%7D%5C%5C%5C%5Ch%3D4.04%5C%20m)
So, the child is able to go at a height of 4.04 m.
Sample Response: The word “conservation” refers to an amount that is unchanged. The total amount of energy in the universe remains the same. The energy in the universe is in balance.
When parallel light rays comes across a concave lens, the rays are refracted outwards. Concave lenses are thinner in the middle part. Parallel light rays diverge and seems to appear from one point called the principal focus. The image formed is smaller.