Answer:
The speed of the object just before it hits Earth is 
(A) is correct option.
Explanation:
Given that,
M = mass of earth
R = radius of earth
The potential energy at height above the surface of the earth
The kinetic energy at height above the surface of the earth
The total energy at height above the surface of the earth
....(I)
The total energy at the surface of the earth
....(II)
We need to calculate the speed of the object just before it hits Earth
From equation (I) and (II)
Here, h = R
Hence, The speed of the object just before it hits Earth is .
A. Earth is orbiting the sun
The atoms vibrate faster and the space between atoms spread
Answer:
1) gravitational energy
2) kinetic energy
3) electrical energy
4) light energy
Explanation:
The gravitational energy is that which depends on the height associated with the gravitational force, that is, at the height from which the water falls.
Kinetic energy is that generated by movement. the movement of water provides energy for the turbine to move
Electrical energy is that which results in the existence of a potential difference between two points, which allows an electric current to be generated.
Light energy is the perceived fraction of the energy transported by light and manifested on matter in different ways. It behaves and moves like a wave.
Answer:
Explanation:
Formula of lateral displacement
t is thickness of slab , i and r are angle of incidence and refraction respectively .
Given t = .45 m
sin i / sin r = 2.2
sin 46 / sin r = 2.2
sin r = .719 / 2.2 = .327
r = 19°
= .45 x .454 / .9455
= .216 m
= 21.6 cm .
