Answer:
A) is repelled by the sphere.
Explanation:
On rubbing the plastic rod with the wool cloth the rod gains some electrons from the surface of the wool and becomes electrostatically negative in charge.
When this rod is brought near to a neutral metallic sphere then the electrons of the sphere get repelled from the nearest portion of the metallic sphere as it a conductor and the electrons accumulate on the farthest opposite side of the rod.
But when the rod is brought into contact for some time then the from the portion of the rod which is in contact to the sphere loses the electrons from that region to the sphere since plastic is not an electrical conductor so not all the charges travel to the sphere.
Then when the rod is separated, the charges on the sphere spread uniformly and the similar charged rod faces repulsion.
<span>The name given to the semiconductor device that has 3 or more elements is a Transistor</span>
Answer:
m
Explanation:
d = separation between the two narrow slits = 1.5 mm = 1.5 x 10⁻³ m
λ = wavelength of the light = 514 nm = 514 x 10⁻⁹ m
D = Distance of the screen from the narrow slits = 5.0 m
w = Distance between the adjacent bright fringes on the screen
Distance between the adjacent bright fringes on the screen is given as
![w = \frac{D\lambda }{d}](https://tex.z-dn.net/?f=w%20%3D%20%5Cfrac%7BD%5Clambda%20%7D%7Bd%7D)
![w = \frac{(5.0)(514\times 10^{-9}) }{1.5\times 10^{-3}}](https://tex.z-dn.net/?f=w%20%3D%20%5Cfrac%7B%285.0%29%28514%5Ctimes%2010%5E%7B-9%7D%29%20%7D%7B1.5%5Ctimes%2010%5E%7B-3%7D%7D)
m
Answer:
Kinetic energy of diver at 90% of the distance to the water is 9000 J
Explanation:
Let d is the distance between the position of the diver and surface of the pool.
Initially, the diver is at rest and only have potential energy which is equal to 10000 J.
As the diver dives towards the pool, its potential energy is converting into kinetic energy due to law of conservation of energy, as total energy of the system remains same.
Energy before diving = Energy during diving
(Potential Energy + Kinetic Energy) = (Kinetic Energy + Potential Energy)
When the diver reaches 90% of the distance to the water, its kinetic energy
is 90% to its initial potential energy, as its initial kinetic is zero,i.e.,
K.E. = ![\frac{90}{100}\times10000](https://tex.z-dn.net/?f=%5Cfrac%7B90%7D%7B100%7D%5Ctimes10000)
K.E. = 9000 J
The answer is A. They are both processes in which water is changed into water vapor.