When light is passing from a denser medium to a lighter medium ( for example: from water to air)
<span> When the angle of refraction is greater than the critical angle( angle of incidence when the angle of refraction is perpendicular to the normal) of the denser medium.</span>
Answer:
Option (D), lunar eclipse
Explanation:
When the moon comes between the earth and sun, the lunar eclipse occurs, so D is the lunar eclipse. It is full moon day.
C is the position when there is new moon day and it is solar eclipse.
So, option (D) is correct.
Answer:
The ratio of kinetic energy of accord to the truck is 1 : 3.
Explanation:
Speed, v = 30 m/s
Ratio of mass of accord to truck = 1 : 3
The kinetic energy is given by
As the speed is same so the ratio of the kinetic energies is same as the ratio of masses.
Answer B adds salt-free water, thus decreasing the salinity of oceans.
Answer:
D. 4 m/s²
Explanation:
Given;
initial velocity of the car, u = 0
distance traveled by the car, s = 18 m
time of motion of the car, t = 3.0 s
The magnitude of the car's acceleration is given by;
s = ut + ¹/₂at²
s = 0 + ¹/₂at²
s = ¹/₂at²
2s = at²
a = 2s / (t²)
a = ( 2 x 18) / (3²)
a = 4 m/s²
Therefore, the magnitude of the car's acceleration is 4 m/s²